The sources of geogenic arsenic in aquifers at Datong basin, northern China: Constraints from isotopic and geochemical data

Xie, Xianjun; Wang, Yanxin; Ellis, A. S.; Su, Chunli; Li, Mengdi

doi:10.1016/j.gexplo.2011.05.006

Cited by 40 publications

(7 citation statements)

References 42 publications

(61 reference statements)

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“…As discussed above, the major and trace element analysis indicated that the Datong sediments along the borehole have similar sources and are predominantly derived from Permian to Cretaceous sedimentary rocks at this site. This conclusion is consistent with the results based on zircon U-Pb dating of high As aquifer sediments in this area (Xie et al, 2011).…”

Section: The Sediment Provenancesupporting

confidence: 93%

“…As-bearing minerals were regarded as the sources of As in sediments (Smedley and Kinniburgh, 2002;Xie et al, 2011;Harvey et al, 2002;Saunders et al, 2005). In order to understand the impact of sedimentary provenance on the accumulation of As in aquifer sediments, trace and major elements studies were conducted on the Datong aquifer sediments.…”

Section: The Sediment Provenancementioning

confidence: 99%

“…The As in sedimentary aquifers may result from chemical and mechanical weathering of As-bearing rocks (Saunders et al, 2005;Xie et al, 2011;Zheng, 2007), and As accumulation and distribution in aquifer sediments is often determined by provenance and weathering intensity. In the Datong basin, the aquifer sediments were largely derived from chemical weathering and subsequent erosion of bedrock around the basin in the Pliocene to Pleistocene and Holocene (Li and Zhu, 2000).…”

Section: Introductionmentioning

confidence: 99%

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Impact of sedimentary provenance and weathering on arsenic distribution in aquifers of the Datong basin, China: Constraints from elemental geochemistry

Xie

Wang

Ellis

et al. 2014

Journal of Hydrology

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Section: The Sediment Provenancesupporting

confidence: 93%

Section: The Sediment Provenancementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Impact of sedimentary provenance and weathering on arsenic distribution in aquifers of the Datong basin, China: Constraints from elemental geochemistry

Xie

Wang

Ellis

et al. 2014

Journal of Hydrology

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“…Linking As reactivity and speciation to the identity, relative quantity, and reactivity of Fe-bearing minerals in the river basins of South and Southeast Asia is needed to understand the distribution and transport of As. Moreover, efforts to this end have concentrated in the Bengal Basin (Akai et al, 2004;Datta et al, 2009;Ghosh et al, 2006;Hasan et al, 2009;Itai et al, 2010;Polizzotto et al, 2006;Polizzotto et al, 2005;Seddique et al, 2008;Seddique et al, 2011;Swartz et al, 2004;Uddin et al, 2011), and to a lesser extent in the Red River Delta (Vietnam) (Phuong et al, 2012;Postma et al, 2010;Postma et al, 2007) and Datong Basin (China) (Xie et al, 2009a;Xie et al, 2009b;Xie et al, 2011;Xie et al, 2008). Little is known about mineralogical aspects of the Mekong Delta influencing dissolved As concentrations (Kocar et al, 2008;Rowland et al, 2008).…”

Section: Introductionmentioning

confidence: 99%

Reactivity and speciation of mineral-associated arsenic in seasonal and permanent wetlands of the Mekong Delta

Stuckey

Schaefer

Benner

et al. 2015

Geochimica et Cosmochimica Acta

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Millions of people in the deltaic regions of S/SE Asia regularly consume As contaminated groundwater. Arsenic persists within these groundwaters despite being flushed by several pore volumes of recharge, indicative of an in-situ solid phase source. Despite the importance of this solid phase source, the identity and reactivity of the minerals hosting and releasing As in the deltaic aquifers remain poorly constrained. Here we seek to define the chemistry and reactivity of As and its host minerals in aquifer sediments recharged by both seasonally saturated and permanent wetlands on the Mekong Delta of Cambodia. Sediment cores were retrieved to depths of up to 30 m. Selective extractions on near-surface sediments (to depths of 4-6 m) indicate that more than a third (27-50%) of the Fe in the profile is "reducible" (citrate-bicarbonate-dithioniteextractable)-nominally consisting of Fe(III) oxides. The Fe(III) oxide fraction was approximately the same under seasonal wetlands (mean = 39%) compared with sediments from beneath permanent wetlands (mean = 37%). Correspondingly, Fe Kedge extended X-ray absorption fine structure (EXAFS) spectra analysis indicates that the Fe mineral phases are predominantly goethite and hematite (30-50%). Analysis of solid phase As speciation by X-ray absorption near edge structure (XANES) spectroscopy showed arsenate in the shallowest sediments (upper 1 and 4 m of seasonal and permanent wetlands), and arsenite and/or As sulfides as the dominant phases in the deeper sediments. The reducible As fraction ranged from 17-42 % of the total As at both sites. The exception was found in a peat layer at 6 m beneath the seasonal wetland, in which only 1% of the total As was reducible. Arsenian pyrite was the predominant form of As in the peat. Thus, a pool of As hosted by reducible mineral phases persists in sediments below both the seasonal and permanently saturated wetland sites.

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“…During this period naturally occurring As was found to be widespread in groundwater [10]. Arsenic contaminated groundwater has caused problems among millions of human beings in many regions around the world, especially in Asian countries including Bangladesh, India, Cambodia, Vietnam, China and recently also Chinese Taiwan, also found in Hungary, Chile and Argentina [8,11]. Sources of exposure of As was proved to be natural from the earth's crust and widely distributed throughout the environment in the air, water and land.…”

Section: Introductionmentioning

confidence: 99%

Current Situation of Aqueous Arsenic Contamination in Pakistan, Focused on Sindh and Punjab Province, Pakistan: A Review

Ahmed¹,

Mek²,

Nd³

et al. 2017

J Pollut Eff Cont

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The arsenic contamination has seriously affected public health in Pakistan, especially in highly contaminated Sindh and Punjab provinces. Results of recent studies show that over 3% of the population in Punjab was exposed to arsenic contamination of over 50 ug/L in drinking water, and 20% of the population is exposed to over 10 ug/L, with the limited standard of WHO, same as the EPA also sets the maximum contaminant level goal (MCLG) for drinking water. The situation in Sindh province was worse than in Punjab province, as the results show that 16% and 36% of population exposed to arsenic contaminated water over 50 ug/L and 10 ug/L respectively. According to a study conducted and based on samples from 1,184 wells across the country that actually proved that the process of boiling or filtration was not helpful to remove As from groundwater. Recent medical studies have confirmed 40 cases of arsenicosis occurred in worst situation. The purpose of this paper is to make a review about the current situation of arsenic contamination and its effect in the Pakistan.

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The sources of geogenic arsenic in aquifers at Datong basin, northern China: Constraints from isotopic and geochemical data

Cited by 40 publications

References 42 publications

Impact of sedimentary provenance and weathering on arsenic distribution in aquifers of the Datong basin, China: Constraints from elemental geochemistry

Impact of sedimentary provenance and weathering on arsenic distribution in aquifers of the Datong basin, China: Constraints from elemental geochemistry

Reactivity and speciation of mineral-associated arsenic in seasonal and permanent wetlands of the Mekong Delta

Current Situation of Aqueous Arsenic Contamination in Pakistan, Focused on Sindh and Punjab Province, Pakistan: A Review

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