Arsenic contamination of groundwater: A global synopsis with focus on the Indian Peninsula

Geoscience Frontiers, Journal Year: 2020, Volume and Issue: 12(3), P. 101079 - 101079

Published: Oct. 1, 2020

More than 2.5 billion people on the globe rely groundwater for drinking and providing high-quality water has become one of major challenges human society. Although is considered as safe, high concentrations heavy metals like arsenic (As) can pose potential health concerns hazards. In this paper, we present an overview current scenario contamination in various countries across with emphasis Indian Peninsula. With several newly affected regions reported during last decade, a significant increase been observed global contamination. It estimated that nearly 108 are by (with concentration beyond maximum permissible limit 10 ppb recommended World Health Organization. The highest among these from Asia (32) Europe (31), followed Africa (20), North America (11), South (9) Australia (4). 230 million worldwide, which include 180 Asia, at risk poisoning. Southeast Asian countries, Bangladesh, India, Pakistan, China, Nepal, Vietnam, Burma, Thailand Cambodia, most affected. 20 states 4 Union Territories have so far groundwater. An attempt to evaluate correlation between poisoning aquifer type shows extracted unconsolidated sedimentary aquifers, particularly those located within younger orogenic belts world, worst 90% pollution inferred be geogenic. We infer alluvial sediments source postulate strong relation plate tectonic processes, mountain building, erosion sedimentation. Prolonged consumption arsenic-contaminated results severe issues skin, lung, kidney bladder cancer; coronary heart disease; bronchiectasis; hyperkeratosis arsenicosis. Since geogenic origin, extend complexly linked geometry properties region. Therefore, remedial measures designed based mineral, climatological hydrogeological corrective available removing using filters, exploring deeper or alternative treatment itself, dilution method artificial recharge groundwater, conjunctive use, installation nano-filter, other procedures. vast majority poor who live rural areas not aware protocols. creating awareness proper medical care remain great challenge. Very few policy actions taken international level over past decade reduce water, goal preventing toxic impacts health. recommend United Nations Environment Programme (UNEP) WHO should take stock situation launch drive create people/medical professionals/health workers/administrators concern.

Language: Английский

---

Environmental arsenic exposure and its contribution to human diseases, toxicity mechanism and management

Environmental Pollution, Journal Year: 2021, Volume and Issue: 289, P. 117940 - 117940

Published: Aug. 9, 2021

Language: Английский

---

Review on the interactions of arsenic, iron (oxy)(hydr)oxides, and dissolved organic matter in soils, sediments, and groundwater in a ternary system

Chemosphere, Journal Year: 2021, Volume and Issue: 286, P. 131790 - 131790

Published: Aug. 5, 2021

Language: Английский

---

Groundwater hydrochemistry, source identification and pollution assessment in intensive industrial areas, eastern Chinese loess plateau

Environmental Pollution, Journal Year: 2021, Volume and Issue: 278, P. 116930 - 116930

Published: March 11, 2021

Language: Английский

---

Removal of arsenate from contaminated waters by novel zirconium and zirconium-iron modified biochar

Journal of Hazardous Materials, Journal Year: 2020, Volume and Issue: 409, P. 124488 - 124488

Published: Nov. 5, 2020

Language: Английский

---

Role of in Situ Natural Organic Matter in Mobilizing As during Microbial Reduction of Fe^III-Mineral-Bearing Aquifer Sediments from Hanoi (Vietnam)

Environmental Science & Technology, Journal Year: 2020, Volume and Issue: 54(7), P. 4149 - 4159

Published: March 11, 2020

Natural organic matter (NOM) can contribute to arsenic (As) mobilization as an electron donor for microbially-mediated reductive dissolution of As-bearing Fe(III) (oxyhydr)oxides. However, investigate this process, instead using NOM, most laboratory studies used simple fatty acids or sugars, often at relatively high concentrations. To the role relevant C sources, we therefore extracted in situ NOM from upper aquitard (clayey silt) and lower sandy aquifer sediments Van Phuc (Hanoi area, Vietnam), characterized its composition, 100-day microcosm experiments determine effect OM on mineral reduction, As mobilization, microbial community composition. We found that clayey silt (OMC) resembles young, not fully degraded plant-related material, while (OMS) is more bioavailable related biomass. Although all microcosms were amended with same amount (12 mg C/L), extent reduction after 100 days was highest acetate/lactate (43 ± 3.5% total Fe present sediments) followed by OMS (28 0.3%) OMC (19 0.8%). Initial rates also higher (0.53 Fe(II) 6 days) than (0.18 0.08 days, respectively). initially dissolved detected setups, concentrations (8.3 0.3 8.8 0.8 μg As/L) reached OMS, respectively, compared acetate/lactate-amended setups (6.3 0.7 As/L). 16S rRNA amplicon sequence analyses revealed mainly enriched Geobacter, supported growth activity a diverse community. Our results suggest although less efficient stimulating highly acetate/lactate, it ultimately has potential mobilize even As.

Language: Английский

---

Coupled controls of the infiltration of rivers, urban activities and carbonate on trace elements in a karst groundwater system from Guiyang, Southwest China

Ecotoxicology and Environmental Safety, Journal Year: 2022, Volume and Issue: 249, P. 114424 - 114424

Published: Dec. 15, 2022

Hydrogeochemical processes of trace elements (TEs) are considerable significance to river water and groundwater resource assessment utilization in the karst region. Therefore, seven TEs were analyzed investigate their contents, spatial variations, sources, controlling factors Guiyang, a typical urban area southwest China. The results showed that average content (e.g., As = 1.44 ± 0.47 μg/L andCo 0.15 0.06 μg/L) was higher than 0.51 0.42 0.09 0.05 μg/L). types samples dominated by Ca/Mg-HCO3 Ca/Mg-Cl types, while those Ca-Cl types. Principal component analysis (PCA) correlation (CA) analyses indicated Mn study related infiltration. end-member further revealed infiltration (As 0.86-1.81 μg/L, Cl/SO42- 0.62-0.89) activities 0.21-0.32 0.51-0.89) two main As, Co, Mn) area. In addition, ion ratios weathering carbonates also an important control on hydrogeochemistry Fe Guiyang waters. This element (TE) contents greatly associated with input recharge, provided new perspective for understanding geochemical behavior surface bodies, which will help protection areas

Language: Английский

---

Worldwide Distribution, Health Risk, Treatment Technology, and Development Tendency of Geogenic High-Arsenic Groundwater

Water, Journal Year: 2024, Volume and Issue: 16(3), P. 478 - 478

Published: Jan. 31, 2024

The presence of high concentrations geogenic arsenic (As) in groundwater poses a serious threat to the health millions individuals globally. This paper examines research progress with As through comprehensive literature review and analysis, covering distribution, risks, situ remediation, regulatory technologies, development trends, establish reference for future research. global distribution high-As is mainly inland basins river deltas countries South Asia, East America. High-As risk areas can be modeled using hydrogeologic data field measurements. modeling approach allows assessing measuring potential groundwater. In order provide safe drinking water promptly effectively affected by groundwater, rapid detection remediation techniques have been given significant attention. introduces household- or community-scale removal including flocculant–disinfectant, bucket treatment units, use activated alumina, nano zero-valent iron, aquifer iron coating technology, bioremediation, summarizing basic mechanisms each technology. Guaranteeing sustainability site-scale reasonable management, exploring alternative sources are crucial combating contamination. Future studies should aim elucidate As’s coexistence other pollutants treating As-containing wastes sludge produced during process better options.

Language: Английский

---

Arsenic behavior in groundwater in Hanoi (Vietnam) influenced by a complex biogeochemical network of iron, methane, and sulfur cycling

Journal of Hazardous Materials, Journal Year: 2020, Volume and Issue: 407, P. 124398 - 124398

Published: Oct. 29, 2020

The fate of arsenic (As) in groundwater is determined by multiple interrelated microbial and abiotic processes that contribute to As (im)mobilization. Most studies date have investigated individual related (im)mobilization rather than the complex networks present situ. In this study, we used RNA-based community analysis combination with hydrogeochemical measurements elucidate behavior along a 2 km transect near Hanoi, Vietnam. stretches from riverbank across strongly reducing As-contaminated Holocene aquifer, followed redox transition zone (RTZ) Pleistocene at which concentrations are low. Our analyses revealed fermentation methanogenesis as important providing electron donors, fueling microbially mediated reductive dissolution As-bearing Fe(III) minerals ultimately promoting mobilization. consequence high CH4 concentrations, methanotrophs thrive aquifer zone. Finally, our results underline role SO42−-reducing putative Fe(II)-/As(III)-oxidizing bacteria sink for As, particularly RTZ. Overall, suggest network biogeochemical has be considered better understand groundwater.

Language: Английский

---

Arsenic mobilization by anaerobic iron-dependent methane oxidation

Communications Earth & Environment, Journal Year: 2020, Volume and Issue: 1(1)

Published: Nov. 12, 2020

Abstract Arsenic groundwater contamination threatens the health of millions people worldwide, particularly in South and Southeast Asia. In most cases, release arsenic from sediment was caused by microbial reductive dissolution arsenic-bearing iron(III) minerals with organic carbon being used as electron donor. Although many arsenic-contaminated aquifers high concentrations methane were observed, its role mobilization is unknown. Here, using microcosms experiments hydrogeochemical community analyses, we demonstrate that functions donor for methanotrophs, triggering minerals, increasing abundance genes related to oxidation, ultimately mobilizing into water. Our findings provide evidence a methane-mediated mechanism distinct previously described pathways. Taking this together common presence aquifers, suggest methane-driven may contribute on global scale.

Language: Английский

---