Global Distribution of Geogenic High-Arsenic Groundwater: Comparison
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Please note this is a comparison between Version 1 by Wengeng Cao and Version 3 by Camila Xu.

Groundwater constitutes a vital source of freshwater, accounting for roughly 地下水是淡水的重要来源，约占地球上可用淡水资源总量的95% of the total available freshwater resources on Earth. It is utilized not only for daily water needs but also for agricultural irrigation, industrial purposes, ecological recharge, and power generation. 。它不仅用于日常用水需求，还用于农业灌溉、工业用途、生态补给和发电。

  • high-arsenic groundwater
  • worldwide scale
  • in situ remediation of arsenic
  • human health risk assessment

1. Introduction

[1]1. 引言

Groundwater constitutes a vital source of freshwater, accounting for roughly 95% of the total available freshwater resources on Earth [1]. It is utilized not only for daily water needs but also for agricultural irrigation, industrial purposes, ecological recharge, and power generation [2]. Therefore, groundwater holds significant value as a resource and plays a critical role in the environment. The degradation of groundwater quality represents a significant issue within the context of global environmental and climate change today. Since the Industrial Revolution, there has been widespread concern over the deterioration of groundwater quality [3]. Among the various groundwater quality issues, the release of high concentrations of heavy metals has had a significant impact on groundwater quality, and serious consideration must be given to its potential risks and hazards to human health. In particular, As is considered by the United States Agency for Toxic Substances and Disease Registry (ATSDR) to be the pollutant that poses the highest potential risk to human health due to the release from natural sources and the resulting high geogenic concentrations in groundwater [4]. The sources of As in groundwater primarily include natural origins such as geological formations, volcanic activity, and hydrothermal processes, as well as anthropogenic activities including mining, coal combustion, and petroleum extraction [5]. The majority of global health issues caused by As are linked to the consumption of water with high As concentrations. Due to the wide range of negative effects of high As concentrations on human health, the World Health Organization (WHO), the United States, and the European Union (EU) have lowered the Maximum Contaminant Level (MCL) of As in drinking water from 50 μg/L to 10 μg/L as a safe limit for As concentration in drinking water [6][,7]. High-As groundwater is defined as groundwater with As concentrations above the WHO drinking water standard. The enrichment of high-As groundwater is primarily influenced by a combination of natural sources and hydrogeochemical conditions, with the majority of natural high-As groundwater primarily being a result of geological arsenic contamination [5]. Despite the established risks, many countries, such as Bangladesh, Nepal, Pakistan, Mexico, and Argentina, continue to adopt the 50 µg/L standard for arsenic concentration in their national drinking water guidelines, due to a lack of professional expertise, economic considerations, and the low-level arsenic detection technology [8].
Human exposure to As occurs through direct and indirect pathways. Direct exposure involves drinking water with a high As concentration, contact with skin, and inhalation of gasses with a high As concentration. Indirect exposure mainly occurs through the food chain; this includes eating crops, vegetables, and fruits cultivated in As-contaminated soil or irrigated with As-rich groundwater, as well as consuming meat products from animals raised in such environments. Prolonged exposure to As, regardless of the route, can result in serious health disorders affecting the skin, blood vessels, and nervous system. Extended periods of high As exposure also notably increase the risk of developing cancers in organs like the lungs, liver, kidneys, and skin [9][,10] (Figure 1).
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Figure 1. Different pathways of arsenic exposure in groundwater and effects on humans (MMA-Monomethylarsenite; DMA-Dimethylarsenite).
Environmental As exists in groundwater in both organic and inorganic forms, with varying levels of toxicity associated with different forms. The three primary forms of inorganic arsenic are as follows: pentavalent arsenate [As(V)], trivalent arsenite [As(III)], and metallic arsenic. Arsenic in organic form often occurs as various organic arsenic compounds such as Monomethylarsenite (MMA) and Dimethylarsenite (DMA) [11]. Among these, inorganic arsenic is more toxic to humans, and the toxicity significantly differs between the oxidation states of As(III) and As(V). The toxicity of As(III) is more than 60 times higher than that of As(V) and 70 times higher than that of methylated arsenic [12]. The heightened toxicity of As(III) is partially because of its reactivity towards biologically relevant molecules [13]. The methylated arsenic forms, including MMA and DMA, exhibit moderate toxicity, while other organic forms, such as arsenobetaine (AsB) and arsenocholine (AsC), are generally considered non-toxic [12]. In aqueous solutions, As(III) and As(V) primarily exist as oxyanions due to the high charge and small ion radius of As3+ and As5+. The presence and dispersion of distinct arsenic compounds within hydrological systems are markedly influenced by both the redox potential and pH levels prevailing in aquatic environments [14]. Under circumstances characterized by moderate-to-high redox potentials, As tends to stabilize into the As(V) form (H3AsO4, H2AsO4−, HAsO42−, or AsO43−). Conversely, in environments featuring predominantly acidic or weakly alkaline reducing conditions, and lower redox potentials, As(III) tends to be prevalent as the uncharged H3AsO3 molecule [15].

2. Global Distribution of Geogenic High-Arsenic Groundwater

High-As groundwater is widespread worldwide. According to statistics, 107 countries are affected by high-As groundwater, with the highest number in Asia (32) and Europe (31), followed by Africa (20), North America (11), South America (9), and Australia (4) [16]. The most affected countries are Bangladesh, India, Pakistan, China, Nepal [7], Laos [17], Cambodia [18], Myanmar [19], Vietnam [20], and the United States. The world map (Figure 2) displays the global distribution of geogenic high-As groundwater, predominantly found in inland basins and river deltas in South Asian, East Asian, and South American countries. Major countries are shown in Table 1. Generally, the river-marine sedimentary shallow (Holocene) aquifers in the river deltas are the main areas where high-As groundwater occurs naturally, and it occurs mainly under reducing aquifer conditions [21].
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Figure 2. Main countries worldwide affected by geogenic high-arsenic groundwater (≥10 μg/L) (taking the maximum arsenic concentration), see Table 1 for specific data.
Globally, the problem of geogenic high-As groundwater is particularly prominent in South and Southeast Asia, especially in Bangladesh and India [22]. In Bangladesh, 61 areas have been identified as having high-As groundwater. The potential population at risk is approximately 20 million people [23]. According to the National Drinking Water Survey of Bangladesh, around 8% of the water samples had As levels exceeding the Bangladesh standard of 50 μg/L, while around 18% of the samples were above the WHO guideline of 10 μg/L [24]. The concentration of As in groundwater is higher in Bangladesh compared to other countries, and some tube wells even contain As concentrations as high as 4730 μg/L [25][,26]. In India, high-As groundwater has already affected twenty states and four union territories, and about 100 million people are under threat from the toxicity of high-As groundwater [16][,27][,28][,29]. The impact of high-As groundwater in India is concentrated on the Ganges–Yarlung Tsangpo Plain, seen on the neo-alluvial (Holocene) floodplains of the rivers in the Himalayas [30][,31]. Approximately 50–60 million individuals in Pakistan consume high-As groundwater (>50 μg/L) in vulnerable areas [32]. A meta-analysis of groundwater affected by As in Pakistan showed that 73% of these groundwater samples contained arsenic above 10 µg/L [33]. China is also one of the world’s most representative areas of high-As groundwater, with more than 20 provinces/autonomous regions having high-As groundwater problems. These high-As groundwater provinces are mainly located in the fluvial/alluvial-lacustrine plains and basins (Yinchuan Plain, Hetao Plain, Guide Basin, Hohhot Basin, Junggar Basin, Datong Basin, etc.) located in arid/semi-arid regions and alluvial plains/basins and river deltas in humid/semi-humid regions (Yangtze River, Yellow River Delta, Pearl River Delta, Delta, Huaihe River, Alluvial Plain, Yellow River, Yuncheng Basin, Taiyuan Basin, Songnen Plain, etc.) [34][,35][,36][,37]. The population affected by high-As groundwater contamination in China was estimated to be about 19.6 million according to a statistical risk assessment model developed by Rodríguez-Lado et al. [38].
Table 1.
The occurrence of high-As groundwater reported by major countries in the world.
Country Study Area Max As conc. (µg/L) Samples Environmental Condition and/or Enrichment Mechanism References
Afghanistan Ghazni and maidan Wardak provinces 990 746 The weathering and leaching action [39]
Argentina Santiago del Estero Province 14,969 40 Volcanic ash sedimentary environment; agricultural irrigation [40]
La Pampa 5300 44 The geological factors; weathering of volcanic ash and loess; oxidizing condition [41]
Australia Stuarts Point coastal 85 140 Desorption of As from Al-hydroxides and As-enriched Fe-oxyhydroxides; high concentrations of HCO3− and PO4− [42]
Bangladesh Noakhali 4730 52,202 Eroded by flood plain rivers [25]
Bolivia   364 24 The alteration of volcanic rocks; evaporation and redox reactions [43]
Botswana Botswana 116 20 Delta; evaporation concentration; weakly alkaline environment; pH 6.29–8.60 [44]
Brazil   2980   Anthropogenic; volcanic activity and weathering of rocks [43]
Burkina Faso   1630 45 Zones of gold mineralization in volcano-sedimentary rocks [45]
China中国 Datong Basin 1932 1022 The weak alkaline reductive environment; high HCO3− concentration; water–rock interactions [46]
Hetao Basin 572 63 The reducing conditions; the dissolved organic; the competitive effects of other anions [47]
Jianghan Basin江汉盆地 2330 34 The high HCO3− concentrations浓度; microorganisms and exogenous substances; the seasonal variation微生物和外源性物质;季节变化;

strongly reducing environment强烈减少环境;

reducing environment减少环境		 [48]
Taiwan (Lanyang and Chianan Plain)台湾（兰阳和嘉南平原） 1010   Alluvial plain冲积平原; high DOC; strong reducing conditions高 DOC;强还原条件 [49]
Tarim Basin塔里木盆地 91.2 233 Reducing environment减少环境; the dissolved organic; reductive dissolution release溶解的有机物;还原溶出释放; [50]
Yinchuan银川 177 92 Agricultural irrigation农业灌溉; the reductive dissolution of Fe oxides; the high Fe氧化物的还原溶解;高PO4− concentrations浓度 [51]
Pearl River Delta珠江三角洲 161 18 Reductive environment还原环境; the high 高NH4+ concentrations浓度; high concentrations of 高浓度的NH4+ and organic matter和有机物 [52]
Cambodian柬埔寨人   1610 207 Holocene alluvial sediments全新世冲积沉积物; reducing environment减少环境 [53]
Costa Rica哥斯达黎加 Northern Costa Rica哥斯达黎加北部 29,100 35 Associated with the volcanic rock与火山岩有关 [43]
Czech Republic捷克共和国 Mokrsko莫克尔斯科 1690 62 pH 值> 9 [54]
Ecuador厄瓜多尔   969 67 In hot springs泡温泉 [43]
Ethiopia埃塞俄比亚 Southwestern Ethiopia埃塞俄比亚西南部 184.5 44 pH 值< 7 [55]
Ghana加纳   1760 357 Spillages of the mines地雷泄漏; pH pH 值 4.8–6.99 [56]
Hungary匈牙利 Southern Hungary匈牙利南部 260 73 At a深度为 depth of 0.8–2.4 km and containing ，包含 CH4 [57]
India印度 Bhair海尔 1466 1365 Ganga Plain恒河平原; Holocene newer alluvium and the Pleistocene older alluvium全新世较新的冲积层和更新世较旧的冲积层 [58]
Shahpur block, 街区，Bhojpur district, Bihar state区，比哈尔邦 1805 4704 Ganges plain恒河平原 [28]
Punjab旁 遮 普 3192 4780 Alluvial aquifers冲积含水层 [58]
Iran伊朗 Kurdistan库尔德斯坦 Some villages一些村庄 1500 27 Mining and sedimentary environment采矿和沉积环境 [59]
East Azarbaijan东阿塞拜疆-Tabriz Plain大不里士平原 2000 18 Hydrogeological and水文地质和

environmental reducing conditions环境还原条件
Ardabil阿尔达比勒-A city市 5834 163 Interaction of hydrothermal fluids with the rocks and geogenic source-geological structure热液流体与岩石和地质源地质构造的相互作用
Mazandar an-Haraz River河 110 20 Geogenic source and mining地质来源和采矿
Tabas South Khorasan塔巴斯南呼罗珊 53 29 Weathering风化
Razavi Khorasan Chelpu Kashmar拉扎维·呼罗珊·楚普·克什玛尔 606 12 Geogenic地质

Origin sedimentary environment成因沉积环境
Isfahan Mutehgold mining district伊斯法罕穆特金矿区 1061 17 Weathering and mining风化和采矿
Japan日本   38 136 Reducing environment and factory blowdown减少环境和工厂排污 [26]
Korea韩国 Geumsan County锦山县 113 150 Oxidation reaction of sulfide minerals in metasedimentary rocks and desor变质沉积岩中硫化物矿物的氧化反应及高ption process under high pH conditionsH条件下的解吸过程 [60]
Nigeria尼日利亚 Warri瓦里-Port Harcourt, Ogun State, Kaduna哈科特港，奥贡州，卡杜纳 750 20 Alluvial sediments, reducing environment, slightly acidic冲积沉积物，还原环境，微酸性 [16]
Pakistan巴基斯坦 Kasur, 、Shhiwal, 、Bahawalpur, and 和 Rahim Yar Khan 3090 395 Irrigation and factory sewage灌溉和工厂污水 [61]
Lahore municipality拉合尔市 85 41 Topsoil and extensive irrigation of unconfined aquifers, reductive dissolution表土和非承压含水层的广泛灌溉，还原溶蚀 [32]
Mailsi梅尔西 812 44 Human activity人类活动 [49]
Paraguay巴拉圭   120 37 Human activity and volcanic ash deposition environment人类活动和火山灰沉积环境 [43]
Lao PDR老挝人民民主共和国 Vientiane万象 24.4 3 Reducing environment减少环境 [17]
Borikhamxay（博里坎赛酒店） 30 7 Reducing environment减少环境
Champasack尚帕萨克 25.6 27 Reducing environment减少环境
Attapeu阿速坡 31.6 10 Reducing environment减少环境
Myanmar缅甸 Ayeyarwady伊洛瓦底江 630 55 Reductive dissolution of Fe oxyhydroxides氢氧化铁的还原溶解 [49]
Mexico墨西哥 La Laguna Region拉古纳地区 5000 29 Adsorption or coprecipitation on iron oxides, clay-mineral surfaces, and organic carbon在氧化铁、粘土矿物表面和有机碳上的吸附或共沉淀
Zacatecas萨卡特卡斯 75.4 182 Geological地质成因， origin, water–rock interaction水-岩相互作用 [49]
Nepal尼泊尔 Nawalparasi纳瓦帕拉西 2620 18,000 Seasons and climate change, water–rock interaction季节与气候变化，水岩相互作用
Pakistan巴基斯坦 Larkana Sindh,拉尔卡纳信德省， 318 58 pH 值 6.8–8.1 [62]
Punjab旁 遮 普 655 141 pH 值 7.0–9.3 [63]
Spain西班牙 Duero Cenozoic Basin杜罗新生代盆地 613 514 pH 值 5.87–1.58 [64]
Thailand泰国 Suphan Buri素攀武里府 5000 21 pH 值 5.20–5.90; EhEH 250–370 mV毫伏 [16]
USA美国 San Joaquin Valley, California加利福尼亚州圣华金谷 148.5 4983 Arid and semi-arid basins干旱和半干旱盆地;

alluvial, fluvial, and lacustrine deposits冲积、河流和湖泊沉积物; pH > 7.8; reducing conditionspH>7.8;还原条件		 [65]
Lahontan Valley, in Churchill County, Nevada内华达州丘吉尔县的拉洪坦谷 4100 59 Lacustrine sediments湖泊沉积物 [66]
Vietnam越南 Mekong Delta湄公河三角洲 850 109 pH 值 7.22–8.63 [49]
In Europe, As contamination in groundwater is attributed to geothermal and hydrothermal systems, dominated by bedrock and volcanic deposits [在欧洲，地下水的污染归因于地热和热液系统，以基岩和火山沉积物为主[67]。潘诺尼亚盆地（罗马尼亚，塞尔维亚和匈[2]. The situation in the Pannonian Basin (Romania, Serbia, and Hungary) is particularly noteworthy, as over 牙利）的情况尤其值得注意，因为超过600,000 residents may be exposed to high-As groundwater [名居民可能暴露于高砷地下水[57].]。此外，芬兰基岩地下水中砷的最大浓度为 Additionally, the maximum concentration of arsenic found in bedrock groundwater in Finland is 1040 μg/L. The highest concentration of As recorded in the Ischia Island area, southern Italy, was 1479 μg/L, which was 148 times higher than the MCL. Hydrothermal activity and thermal control seem to be the main factors responsible for the liberation of As from minerals [。意大利南部伊斯基亚岛地区记录到的最高砷浓度为1479微克/升，是MCL的148倍。热液活动和热控制似乎是导致砷从矿物中释放的主要因素[68].]。 The United States and Canada have also experienced extensive geogenic high-As groundwater contamination, although the concentration is lower than that of Asian countries [美国和加拿大也经历了广泛的地质成因高砷地下水污染，但其浓度低于亚洲国家[69]. In Latin America, arsenic compounds in groundwater are mainly derived from geothermal fluids as well as volcanic activity []。在拉丁美洲，地下水中的砷化合物主要来源于地热流体和火山活动[43]. The As levels of drinking water are too high in ]。在墨西哥31个州中，有13 of Mexico’s 31 states [个州的饮用水含量过高[70].]。特别是，在La In pLarticular, As concentrations of guna地区的孔隙弱渗透层中发现了5000 μg/L were discovered in pore weakly permeable layers in the La Laguna area [的浓度[71]. Groundwater As sources of geothermal origin have been identified at ]。地下水：在瓜纳华托州的Juventino Rosas in the State of Guanajuato and 和墨西哥州的Ixtapan de la Sal and 和Tonatico in the State of México [已经确定了地下水作为地热来源[72]. The area of ]。阿根廷地下水中受Argentina most affected by As in groundwater is the 影响最大的地区是Chaco-Pampean Plain, with approximately 88% of the 86 collected groundwater samples surpassing the WHO guideline values, and the population at risk in Argentina is about 4 million people [平原，在收集的86个地下水样本中，约有88%超过了WHO的指导值，阿根廷的高危人群约为400万人[54].]。 In Africa, high-As groundwater has been found in only a few areas across the continent, primarily in the western and southern regions, more due to insufficient research rather than a shortage of problems [在非洲，只有少数几个地区（主要是西部和南部地区）发现了高砷地下水，这更多是由于研究不足，而不是缺乏问题[67]. Twenty countries in Africa have recorded high concentrations of arsenic in groundwater, including Botswana, Burkina Faso, Ethiopia, and Ghana []。非洲有20个国家记录了地下水中砷的高浓度，包括博茨瓦纳、布基纳法索、埃塞俄比亚和加纳[67]. The maximum concentration of ]。布基纳法索地下水中As in groundwater in Burkina Faso was 的最大浓度为1630 μg/L, while an analogous maximum concentration of ，而加纳地下水中的As最高浓度为1760 μg/L was detected in groundwater in Ghana [[56][73]. ,73]。

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