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  • Review
  • Open Access

Arsenic cycling in the Earth’s crust and hydrosphere: interaction between naturally occurring arsenic and human activities

Progress in Earth and Planetary Science20185:68

https://doi.org/10.1186/s40645-018-0224-3

  • Received: 6 February 2018
  • Accepted: 5 October 2018
  • Published:

Abstract

Field-based research on naturally occurring arsenic contamination of surface waters and groundwaters and the mechanisms of contamination are reviewed. The distribution of arsenic is strongly related to areas of active plate tectonics, magmatism and associated hydrothermal activity, and high rates of erosion. Sources of arsenic contamination are mainly hydrothermal water, sulfide and arsenide minerals, volcanic ash, and iron oxyhydroxide/oxide as weathering products. The promotion of the reduction and oxidation of arsenic source minerals by in situ microbial activity is an important secondary mechanism that often determines arsenic levels in groundwater. Anthropogenic activities, such as geothermal and mining operations, as well as excess pumping of shallow groundwaters, disperse arsenic in the environment, thereby expanding areas of arsenic contamination.

Graphical Abstract image

Keywords

  • Arsenic contamination
  • Geologic cycle
  • Plate tectonics
  • Reduction
  • Oxidation

Introduction

Human beings are facing a crisis of an increasing demand for freshwater in the face of decreasing freshwater resources. One of the most serious problems threatening water resources is contamination with arsenic, which is highly toxic. Since the late 1980s, when the arsenicosis was reported in West Bengal, India (Mandal and Suzuki 2002), arsenic-contaminated groundwater and associated health disasters have occurred throughout the world, but especially in Asian countries. Arsenic is the first toxic element known to spread globally in the hydrosphere.

The World Health Organization (WHO) guidelines have recommended since 1993 that the arsenic level in aquatic solutions, including drinking water, should be < 10 μg/L. This threshold was selected not so much because it is an epidemiologically safe level but because of the limits of analytical and treatment techniques (WHO 2006). For example, the quantification limit of arsenic by the commonly used atomic absorption spectrophotometry method is 0.001 to 0.005 mg/L, much higher than the limit of 0.01 μg/L for inductively coupled plasma mass spectroscopy. In addition, the guideline followed differs by country: Japan (since 1993), the USA, Canada (both since 2006; EPA 2018; Health Canada 2017), and Australia (since 2011; NHMRC and NRMMC 2011) follow the WHO guideline of 10 μg/L, but many developing countries still apply the older standard of 50 μg/L.

Arsenic is a minor but ubiquitous element of the Earth’s crust, and some chemical species of this amphoteric element are volatile and highly soluble in aquatic solution. As a result, arsenic is easily released from the crust into natural waters in conjunction with changes to the chemistry of the aquatic environment. The estimated arsenic reservoirs and fluxes at the Earth’s surface, including in the shallow crust (Fig. 1), show that anthropogenic activities play an important role in dispersing arsenic contamination to the hydrosphere, pedosphere, and atmosphere. Arsenic has been used for many purposes, but especially for pesticides and wood preservation. For example, sodium arsenite solution applied as a pesticide in cattle dip from 1950s to 1980s led to groundwater in Australia being polluted with up to 3000 mg/L arsenic (McLaren et al. 1998), and in the USA, applications of arsenic-containing pesticides to cotton fields until 1990s increased the arsenic concentration in the soil to 23 mg/kg, compared with an average concentration of 5 mg/kg in surrounding soils (Cox et al. 1996). Since these studies were published, the production of toxic arsenic compounds such as pesticides has decreased, although alloys containing arsenic continue to be used for semiconductors (JOGMEC 2012). Although anthropogenic contamination due to the application of arsenic compounds to agricultural fields is probably decreasing at least in more developed countries, activities to develop natural resources such as mining and geothermal energy extraction are a continuing cause of environmental arsenic contamination.
Fig. 1
Fig. 1

Global arsenic cycle. Fluxes and reservoir sizes in different parts of the geosphere (Matschullat 2000)

This review focuses on naturally occurring arsenic contamination from the points of views of geologic arsenic cycling and anthropogenic impacts on the spread of arsenic contamination.

Global distribution of arsenic contamination

There are three major natural sources of arsenic contamination: hydrothermal activity, ore deposits, and Cenozoic sediments. Other sources include coal and coal combustion. Arsenic-contaminated areas in Latin America (14 countries in Central and South America) are concentrated in the circum-Pacific region, where they are associated with the “Ring of Fire” (Fig. 2). The arsenic sources in this area are related to magmatic activity (volcanoes including volcanic ash and sulfide deposits). In addition, more than 100 aquifers along river basins in this region are contaminated with arsenic (Bundschuh et al. 2012).
Fig. 2
Fig. 2

World arsenic contamination map. This figure was produced based on the following reports and those in the text: Smedley and Kinniburgh (2002); Acharyya et al. (2005); An et al. (1997); Blanes et al. (2011); Camm et al. (2004); Gutiérrez-Caminero et al. (2015); Razo et al. (2004)

High arsenic concentrations in geothermal waters reflect the fact that arsenic is a volatile component of magma and highly soluble in water. Hot-spring waters sometimes contain high concentrations of arsenic; for example, many hot springs in Yellowstone National Park, USA, are contaminated with up to 10 mg/L arsenic (Stauffer and Thompson 1984; Webster and Nordtrom 2003). Arsenic from hot springs can be transported in surface waters and enter riverbed sediments; for example, along the Owens River, arsenite released from hot springs and oxidized to arsenate in the river water by microbial activity precipitates and settles to the bottom, where it becomes a component of the riverbed sediments (0–60 mg/kg; Nimick et al. 1998). Geothermal well fluids occasionally contain higher arsenic concentrations than hot-spring waters, from > 1 up to 50 mg/L (Webster and Nordtrom 2003 and references therein). Prior to 2000, the outflow of arsenic from Waikato Power Station, New Zealand, was 145 t/year, but since then, it has been reduced to ~ 70 t/year (Webster-Brown and Lane 2005 and references therein). The large quantity of arsenic in the power station drainage water has led to arsenic concentrations of 61–1790 mg/kg in the Waikato River (Webster-Brown et al. 2000).

Ore deposits are the second main source of arsenic. For example, in New Zealand, arsenic released from arsenic-bearing marcasite found in hydrothermal ore deposits formed 5 Ma causes groundwater concentrations of > 100 μg/L (Craw et al. 2000). Although the distribution of naturally occurring arsenic contamination around ore bodies is generally localized, anthropogenic materials associated with the mining of ore bodies, such as tailings and sludge, expand the area of contamination into the hydrosphere and pedosphere of the surrounding area. The excavated ore bodies and the ensuing chemical weathering produce sediments highly contaminated with arsenic that then become sources of potential arsenic contamination.

The third main source of arsenic contamination is aquifers in Cenozoic sediments, which occur widely around the world (Fig. 2). The total arsenic concentration in contaminated groundwater is not extremely high compared with the average concentration in soils and sediments. For example, in a Holocene aquifer in Bangladesh, the total arsenic concentration in bulk aquifer sediments ranges from 5 to 16 mg/kg whereas > 1 mg/L arsenic has been detected in the groundwater (Seddique et al. 2011). Thus, contamination of the groundwater depends mainly on the chemical form of the arsenic host phase and the occurrence of changes to the aquatic environment that lead to the release of arsenic from the aquifer sediments rather than on the arsenic concentration in the sediments. The mechanisms by which arsenic is released from Cenozoic, especially Holocene, aquifer sediments are described in the next section.

Release mechanisms of arsenic from aquifer sediments

Naturally occurring arsenic contamination of surface waters and groundwater is associated with changes in ambient physicochemical conditions. The most important factors controlling the release of arsenic from sediments to the aquatic environment are the redox conditions and the pH of the water.

Arsenic contamination of groundwater is most serious, from the point of view of spatial scale and the number of affected individuals, in the Holocene aquifers along large rivers that originate in the Himalayas and on the Tibetan Plateau: for example, along the Ganges–Brahmaputra river system in Nepal, India, and Bangladesh; along the Red River in Vietnam; along the Mekong River in Cambodia and Vietnam (e.g., Charlet and Polya 2006; Fendorf et al. 2010); and along the Yellow River in Inner Mongolia, China (e.g., Smedley et al. 2003; Guo et al. 2016). Arsenic-contaminated aquifers in which ferrous and ammonium ions are dissolved in the groundwater are characterized by reducing conditions and microbial respiration (e.g., Radloff et al. 2008; Quichsall et al. 2008). Reduction of groundwater is the main mechanism causing the dissolution of arsenic in Cenozoic aquifers; the major host phase is iron oxyhydroxides/oxides, which strongly adsorb arsenic (e.g., Nickson et al. 2000; van Geen et al. 2004). Iron oxyhydroxides/oxides are stable under oxic (positive Eh) and weakly acid to alkaline (pH > 4) conditions, whereas arsenic is released by desorption from or decomposition of iron oxyhydroxides/oxides under reducing and alkaline conditions (van Geen et al. 2006).

Arsenic contamination also occurs in oxic aquifers (Amini et al. 2008), where volcanic ash is often the arsenic source. For example, aquifers of the Ethiopian Rift Valley, Africa (0.6–190 μg/L; Rango et al. 2013), have become contaminated through the dissolution of volcanic ash under oxic conditions. Such arsenic-contaminated groundwaters formed via dissolution of volcanic ash in oxic environments are widespread in South America, especially in Argentina and Bolivia. Groundwaters in the Pampas of Argentina contain a few hundred micrograms arsenic per liter, and the mean Eh, dissolved O2, and pH of the contaminated groundwaters are + 73 ± 65 mV, 6.6 ± 2.2 mg/L, and 6.9–8.9, respectively. The level of contamination is in general lower in oxic than in anoxic aquifers, although the arsenic concentration in the aquifers of the Pampas can be as high as 15,000 μg/L (Bundschuh et al. 2012 and references therein; Nicolli et al. 2012). In a semi-arid climate, intense chemical weathering of volcanic ash during the rainy season and carbonate precipitation from the water during the dry season produce alkaline conditions. Arsenic concentrations in South America are secondarily controlled by the adsorption–desorption affinity of iron oxyhydroxides produced by chemical weathering (Bundschuh et al. 2012). An alkaline arsenic-contaminated water was observed in the pit lake of an abandoned gold mine (Savage et al. 2009) and in groundwaters in Punjab, Pakistan, where the arsenic concentration can reach 1900 μg/L, plausibly as a result of chlorite weathering at a pH range from 6.9 to 8.0 under oxic conditions without dissolved iron (Farooqi et al. 2007a, 2007b; Masuda et al. 2010).

Distribution of arsenic in Japan

A geochemical map of arsenic in the Japanese islands (Imai et al. 2004) was produced using data from elemental analyses of riverbed sediments, which generally reflect the average concentrations in the surrounding geology (Fig. 3). It is notable that arsenic is distributed along the active volcanic front in Northeast Japan and Kyushu, but it is associated with Cretaceous to Neogene igneous rock bodies on western Honshu Island.
Fig. 3
Fig. 3

Geochemical map showing arsenic distribution of riverbed sediments of Japan (Imai et al. 2004). The areas indicating volcanic fronts and plutonic rock ranges are added for this report

Hydrothermal activity has been reported to cause arsenic contamination in many hot spring areas of Japan since the 1950s; for example, in Beppu (Kyushu) (Kawakami et al. 1956), Tamagawa (Akita, Northeast Japan) (Minami et al. 1958), Hakone, Yugawara (Kanagawa) (Awaya et al. 2002), and Toyohira (Hokkaido) (Jin et al. 2012). In Kusatsu-Shirane (Gunma), hot-spring water with an arsenic concentration of up to 7 mg/L flowed into the Yukawa River from the middle 1980s to the 1990s (Kikawada et al. 2006, 2009). A maximum arsenic concentration of 3.4 mg/L was reported in hydrothermal water at Kakkonda Geothermal Plant (Akita) (Okada et al. 2002).

One of the most serious Japanese arsenic disasters occurred at Toroku mine, Miyazaki (Kyushu), where arsenite was mined from the 1820s to 1962; in 1990, 146 people were found to be suffering from arsenicosis due to inhalation of refining soot and drinking contaminated water (Shimada 2009). Mining and smelting activities often cause arsenic contamination to be spread to air, sediments, and streams, whereas in the absence of such activities, it is usually confined to a small area (as noted in the “Global distribution of arsenic contamination” section). In a study in the Hokusetsu Mountains, Osaka Prefecture, on the eastern edge of the Cretaceous–Neogene magmatic bodies of western Honshu, Even et al. (2017) observed that hornfels with a high arsenic content near the granitic complex led to arsenic contamination of the surrounding ground and surface waters. Although many sulfide mines are present in this area, they are not as important as sources of arsenic contamination as the arsenide disseminated in hornfels and shales. Similarly, leaching and oxidation of arsenic in disseminated hydrothermal gold ore deposits hosted in Miocene sedimentary rock led to arsenic contamination of shallow groundwater in Sulawesi, Indonesia (Iskandar et al. 2012). The mechanism of arsenic contamination in both cases was probably oxidation and decomposition reactions of oxic water infiltrating through a fault system with diffusively distributed sulfides and arsenides.

In addition, Shimada (1996) reported that 2635 of 11,673 wells (22.6%) in the Cenozoic aquifer beneath Tsukushi Plain, Fukuoka Prefecture (northeast Japan), contained > 10 μg/L of arsenic. Fortunately, however, no cases of arsenicosis have been reported from this area.

Geologic cycling of arsenic

Arc magmatism and subsequent hydrothermal activity, together with high rates of erosion and transport to sedimentary basins downstream, contribute to contamination via in situ decomposition of arsenic-containing minerals. Tectonics plays a major role in determining erosion rates, which is partly ascribable to steeper slopes produced by active crustal movement (Hecht and Oguchi 2017). Thus, plate tectonics play an important role in the geologic cycling of arsenic. In this section, the geologic cycling of arsenic is documented (Fig. 4).
Fig. 4
Fig. 4

Geologic cycle concerning redistribution of arsenic. Digit in parenthesis gives the average concentrations of each geologic body (references are in the text). Purple and blue colored letters indicate the releasing and fixing mechanism of arsenic in the cycle

Arsenic is both a siderophile and chalcophile element that can behave as a metal and combine with sulfur; however, in molten rock, it shows volatile behavior, similar to the light rare earth elements (Sims et al. 1990). As of 2014, arsenic has been shown to occur in 568 different mineral species (Nordstrom et al. 2014). The primary arsenic-containing mineral species are sulfides and arsenides, which form abundantly in association with magmatism and related hydrothermal activities. These include realgar (As4S4), orpiment (As2S3), arsenopyrite (FeAsS), and enargite (CuAsS). Other sulfide minerals are also primary sources of arsenic, especially pyrite, which can contain > 2% arsenic (e.g., pyrite in the Mother Lode Gold District of California; Savage et al. 2000). Pyrite is commonly distributed not only in igneous rock bodies but also in sedimentary formations; for example, under strongly reducing conditions, arsenic is incorporated into authigenic pyrite during sediment diagenesis (e.g., Masuda et al. 2005; Saunders et al. 2008).

The partition coefficient of arsenic between sulfide and silicate melts varies as a function of oxygen fugacity; at a given temperature and FeO content, the proportion of arsenic in silicate and monosulfide melts increases with oxygen fugacity (Li and Audétat 2012, 2015). Although silicate and carbonate mineral phases do not host arsenic as a major element (Majzlan et al. 2014), under conditions of low temperature, high oxygen fugacity, and low sulfur fugacity, silicates and carbonates can incorporate arsenic; for example, filatovite (K [Al, Zn]2(As, Si)2O8), a variety of feldspar, has been found to be associated with volcanism in Kamchatka (Vergasova et al. 2004). Charnock et al. (2007) also found that arsenic was incorporated into garnet in the overgrowth of a hydrothermal vein, and Pascua et al. (2005) found arsenic-enriched smectite in hydrothermal precipitates at a geothermal plant in Akita, Japan. In addition, Ryan et al. (2011) reported that groundwater in the fracture zone of ultramafic rocks was contaminated with arsenic derived from serpentine and magnesite via chemical weathering.

McDonough and Sun (1995) estimated the arsenic concentration of Earth’s primitive mantle to be 0.05 mg/kg. Hattori et al. (2002) analyzed mantle xenoliths and found that arsenic was highly concentrated in microscale sulfide minerals, and they reported that its concentration was higher in lherzolite than in harzburgite from the same area. For example, concentrations in sulfide minerals from lherzolite and harzburgite in Lesotho were > 200 mg/kg and < 14 mg/kg, respectively. In addition, comparative analyses of mantle xenoliths of Ichinomegata, Japan, showed that arsenic was depleted in wedge mantle, where microscale sulfide minerals had arsenic concentrations of < 50 mg/kg (Hattori et al. 2002).

Norr et al. (1996) reported arsenic concentrations of ~ 10 mg/kg in arc magmas enriched by hydrothermal fluids derived from metamorphic dehydration of the subducting slab, and they confirmed the release of arsenic from the subducting slab by both laboratory experiments and analyses of field-collected samples. You et al. (1996) conducted laboratory hydrothermal experiments in which they reacted sediment from the Nankai Trough, where the Philippine Sea Plate is subducting beneath the Eurasian Plate, with a synthetic NaCl–CaCl2 solution and showed enrichment of the hydrothermal solution with arsenic at the relatively low temperature of ~ 300 °C. However, in relatively cool subduction zones such as that in which the Catalina Schist formed, less fore-arc devolatilization of arsenic occurs, and arsenic is more likely to be deeply subducted, resulting in arsenic-enriched arc lavas (Bebout et al. 1999). Arsenic-bearing serpentine, possibly formed by alteration of fore-arc mantle, has been found in the Himalayas, where the arsenic was derived from fluid from the subducting slab (Hattori et al. 2005). Norr et al. (1996) documented a decrease in the arsenic concentration of arc lavas on the order of 85%, in some cases as much as 95%, from fore-arc to back-arc along convergent margins. Arsenic is also released from deep continental and island-arc crust during the low-temperature and high-pressure metamorphism that forms pelitic schists; in rocks from the Sambagawa metamorphic belt, Japan, the arsenic concentration decreased from ~ 10 mg/kg to 0 as the temperature of metamorphism increased from 300 to 450 °C (Fujiwara et al. 2011).

Submarine hydrothermal fluids from the East Pacific Rise and the Mid-Atlantic Ridge contain up to 80.5 μg/L and 24 μg/L of arsenic, respectively, whereas those from back-arc basin and island-arc locations are much higher (1386 μg/L and 5850 μg/L, respectively; Breuer and Pichler 2013). Most arsenic in hydrothermal solutions hosted by basalt in Iceland is complexed with sulfur (i.e., As (OH)S22−, AsS3H2−, AsS33−, As (SH)4; Sigufusson et al. 2011). Arsenic and sulfur form covalent bonds, and these chemical species precipitate from the hydrothermal solution as arsenide and sulfide minerals. Thus, many sulfide minerals, such as pyrite, contain arsenic as an impurity. As the temperature of the hydrothermal solution decreases and its oxygen fugacity increases, arsenic–sulfur complexes are decomposed and oxidized to arsenites, which are commonly found in hot-spring water where it flows out at the surface.

The arsenic concentration of Earth’s crust is 1 to 1.8 mg/kg on average (e.g., Taylor and McLennan 1985; Wedepohl 1995), and all types of rocks and sediments contain arsenic at concentrations on the order of milligrams per kilogram (Table 1). Surface sediments and soils in various parts of the world contain higher and more variable concentrations, ranging from 2 to 20 mg/kg on average, than the average crustal concentration (Mandal and Suzuki 2002 and references therein). The average arsenic concentration in 3024 marine sediment samples from coastal Japan was determined to be 14 mg/kg, with a maximum concentration of ~ 580 mg/kg; however, 65% of the sediments had < 10 mg/kg, and 87.5% had < 20 mg/kg (AIST: https://gbank.gsj.jp/geochemmap/ocean/data/ganyuryo/ocean-noudo.csv). Sediments with high concentrations of arsenic in inland areas of Japan are associated with coal and sulfide mines (Ohta et al. 2010).
Table 1

Arsenic concentrations of rocks and sediments

Rock type

Average As concentration (mg/kg)

Range of concentration (mg/kg)

Igneous rock

 Basalt

2.3

0.18–113

 Andesite

2.7

0.5–5.8

 Granite

1.3

0.2–15

Metamorphic rock

 Slate

18

0.5–143

Sedimentary rock, sediments

 Shale/submarine shale

3–15

< 490

 Marine sedimentsa

14

0~580

 Sandstone

4.1

0.6–120

 Limestone/dolomite

2.6

0.1–20.1

 Evaporite

3.5

0.1–10

 Ferrigenous sedimentary rocks

 

1–2900

 River and lake sediments

5

< 1–13,000

 Soli

 

0.4–100

 Peaty soil

13

2–36

 Coal

 

0.3–35,00

Edited data from Boyle and Jonasson (1973) and Smedley and Kinniburgh (2002)

aCoastal area of Japan Islands, AIST https://gbank.gsj.jp/geochemmap/ocean/data/ganyuryo/ocean-noudo.csv

Solubilities of sulfide and arsenide minerals in water are generally low, and in anoxic environments, these minerals are insoluble. For example, under standard temperature and pressure conditions, the solubility coefficient (as log K) of realgar (AsS) is − 83.13, and that of orpiment (As2S2) is − 180.43 (Boyle and Jonasson 1973). However, in oxic waters, those minerals are easily oxidized to dissolve. Typically, during chemical weathering of arsenic ore deposits and subsequent soil formation, arsenic host phases change as follows: arsenopyrite and löllinite in the ore body become scorodite, pharmacosiderite, and arsenosiderite in the weathered rock, and then arsenic-bearing goethite in soil (Majzlan et al. 2014). In the alteration products, arsenate ion substitutes for sulfate ion under neutral to alkaline conditions (Fernández-Martínez et al. 2008). Because in general arsenite and arsenate minerals (e.g., scorodite) are highly soluble in aqueous solution, except under strongly acidic conditions, these minerals are often sources of arsenic contamination. In fact, weathering products can be more important sources of arsenic contamination than primary source rocks and minerals as a result of secondary enrichment and their higher solubilities. For example, bulk arsenic concentrations in soils, sediments, and weathered crust from river basins in the Mother Lode District, California, are higher (> 2000 mg/kg at the maximum) than concentrations in nearby host rocks (< 600 mg/kg) (Savage et al. 2000).

In arsenic-contaminated Cenozoic aquifers, arsenic is hosted mainly in iron oxyhydroxides/oxides, especially goethite, which is a weakly crystallized product from ferrihydrite (amorphous iron hydroxides) via chemical weathering of iron-bearing minerals. However, few studies have examined the site of iron oxyhydroxides/oxide precipitation and the incorporation of arsenic into the aquifer sediments. Dissolved arsenic in the Red River of Vietnam is probably derived from sulfide mineral smelting operations at upstream locations in China (Cui et al. 2014). However, waste arsenic from smelting operations cannot be the source of the arsenic in the Quaternary sediment aquifers of the delta. In the Red River delta, the major mechanism of arsenic contamination of groundwater is probably reduction of arsenic-bearing iron oxyhydroxide minerals (e.g., Berg et al. 2007). Instead, arsenic-bearing iron hydroxides/oxides in the delta sediments are probably chemical weathering products transported from an upstream source area. In situ decomposition of arsenic-bearing pyrite occurring in association with seasonal changes of the groundwater level was presumed to be the cause of arsenic contamination in Munshuganj, Bangladesh (Pollizzotto et al. 2005), whereas in situ chemical weathering of chlorite was inferred to be the main mechanism in Sonragaon, Bangladesh (Masuda et al. 2012, 2013). The results of these studies imply that the source of arsenic contamination in aquifers of the Ganges–Brahmaputra delta is in situ dissolution of arsenic from primary minerals rather than dissolution of or desorption from arsenic-bearing iron oxyhydroxides. Moreover, excess use of groundwater would accelerate such dissolution by promoting inductive recharge of surface water and rapid changes in chemical conditions.

Biogeochemical reactions related to arsenic contamination

Biogeochemical reactions are another factor controlling arsenic behavior, especially in the hydrosphere and pedosphere. Primary production affects arsenic behavior, especially in surface waters, because of the similarity of the chemical characteristics of As(V) and phosphorous. Clean open-ocean water contains 1.5 μg/L arsenic on average (Andreae 1978), whereas in terrestrial waters, the background level of arsenic is < 0.1 μg/L (Matschullat 2000), but the concentration varies widely, depending on the geology and on the presence of anthropogenic sources along the channels. Biological alteration of arsenic compounds in surface waters has been well documented. Andreae (1978) showed that As(III), DMAA(V) (dimethylarsinic acid), and MMAA (V) (monomethylarsonic acid) are produced in association with increasing phytoplankton activity in Donner and Squaw lakes in California, and since then, numerous studies have documented that increasing eutrophication of estuaries is globally associated with the reduction of arsenate and organo-arsenical production. For example, arsenite and methyl-arsenic species became dominant in Lake Biwa water as biological activity increased (Hasegawa et al. 2010). Seawater contains as much as 1.8 μg/L arsenic, and the arsenic is sometimes concentrated by marine biological activity. For example, arseno-sugar compounds concentrate in phytoplankton and algae, and arseno-betaine concentrates in marine animals (Edmonds et al. 1997). Derivatives such as monomethylarsonic acid can also form by in situ microbial methylation (Reimer and Thompson 1988). In coastal areas, organo-arsenic compounds, mostly derived from marine biological activity, account for < 1% of total arsenic in surface sediments (Takeuchi et al. 2005). Takeuchi et al. (2005) noted that organo-arsenic compounds in marine sediments are decomposed by microbial activity within several decades; therefore, the formation rate of new organo-arsenic compounds is smaller than their degradation rate.

Microbial metabolic activity also plays a key role in the cycling of arsenic in the geosphere, including in groundwater aquifers, because microorganisms transform the arsenic into more mobile forms (Oremland and Stolz 2003; Yamamura and Amachi 2014). Microbially mediated metabolic activity involving arsenic can be categorized into four processes: (1) arsenite oxidation, (2) arsenate respiration, (3) arsenate reduction, and (4) arsenite methylation (Mukhopadhyay et al. 2002; Cai et al. 2013). Arsenic-metabolizing microbes were first identified in geologic bodies in which arsenic had become concentrated; for example, arsenite-oxidizing and arsenate-reducing bacteria were found in riverbed sediments containing mine tailings in France (Quéméneur et al. 2010). Arsenic-metabolizing bacteria are now known to be widely distributed in both contaminated and uncontaminated sediments (Cai et al. 2013).

Incubation experiments conducted with sediments from arsenic-contaminated groundwater aquifers of the Ganges–Brahmaputra delta demonstrated a relation between microbial activity and arsenic behavior; for example, arsenic was fixed in authigenic framboidal pyrite (Akai et al. 2004), and anaerobic metal-reducing bacteria worked to release arsenic from the sediments via reduction of Fe (III) (Islam et al. 2004). Zhu et al. (2008) showed that arsenic-bearing pyrite in black shale decomposed seven times faster when incubated with microbes than when incubated without microbes. These experimental results demonstrated that microbial activity can promote arsenic contamination of groundwater aquifers by changing the arsenic phase from insoluble to soluble.

Arsenic-oxidizing (Ghosh et al. 2014) and arsenic-reducing bacteria (Paul et al. 2015) identified by genetic analyses of microorganisms in arsenic-contaminated groundwaters from West Bengal, India, also suggest that microbial activity plays an essential role in releasing arsenic into groundwater aquifers in that area.

Conclusions

Although natural arsenic contamination processes of surface and groundwaters are not simple but involve various interactions among the geosphere, hydrosphere, and biosphere, contamination mechanisms have been well documented in recent decades. Arsenic contamination is widespread globally, but contaminated areas tend to concentrate in and around active tectonic zones. Large-scale contamination does not simply reflect the arsenic concentration in host rocks and sediments; the dispersal of arsenic phases is important for promoting water–mineral interactions because of the large reaction interface between minerals/materials and water. In addition, secondary arsenic minerals formed by chemical weathering likely expand the area and increase the level of contamination in association with biogeochemically promoted changes of redox and pH conditions in the hydrosphere.

The arsenic biogeochemical cycle affects the food chain. Inorganic arsenic compounds not only contaminate the hydrosphere, they also accumulate in biological organisms. Because inorganic arsenic compounds are more toxic than most organic arsenic compounds, their presence in agricultural products is concerning. For example, in Japan, rice is a major source of inorganic arsenic (Oguri et al. 2014). Research aimed at enhancing the understanding of the metabolic cycling of arsenic by humans would facilitate prevention and mitigation of arsenic poisoning.

Not all arsenic contamination can be mitigated, because some contamination occurs as a result of natural processes. However, by acquiring more knowledge of the natural arsenic cycle, we can find ways to minimize the area and number of people affected by arsenic contamination. Many studies have documented the chemical properties and reaction paths of arsenic species and identified arsenic-metabolizing bacteria with the aim of developing chemical treatment and bioremediation methods for arsenic-contaminated groundwaters (e.g., Takeuchi et al. 2007; Yamamura and Amachi 2014). International cooperation with regard to both scientific and practical aspects is key to preventing and mitigating arsenic disasters, especially in developing countries, where they can be particularly severe.

Declarations

Acknowledgements

I thank the session conveners of the 2017 JpGU annual meeting, especially Prof. Y. Himiyama, for giving me the opportunity to present this report, and two anonymous reviewers, for the valuable comments to improve the manuscript.

Funding

This work was supported by KAKENHI (JSPS scientific fund) #17H01863.

Author’s contributions

The author read and approved the final manuscript.

Competing interests

The author declares that there are no competing interests.

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Authors’ Affiliations

(1)
Graduate School of Science, Osaka City University, 3-3-138, Sugimoto, Sumiyoshi-ku, Osaka 558-8585, Japan

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