Residential exposure to drinking water arsenic in Inner Mongolia, China

Ning, Zhixiong; Lobdell, Danelle T.; Kwok, Richard K.; Liu, Zhiyi; Zhang, Shiying; Ma, Chenglong; Riediker, Michael; Mumford, Judy L.

doi:10.1016/j.taap.2007.02.012

Cited by 40 publications

(23 citation statements)

References 13 publications

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“…The major source of human arsenic exposure is from drinking water. Chronic arsenic poisoning via drinking water has been reported in many countries, including Bangladesh, Vietnam, and China, where arsenic in water exceeds the safety limit in many localities (Berg et al 2001;Ning et al 2007). Additionally, As can also enter the food chain through crops irrigated with the As-contaminated groundwater (Smith et al 2002;Meharg 2004).…”

Section: Introductionmentioning

confidence: 99%

Accumulation and Transformation of Arsenic in the Blue-Green Alga Synechocysis sp. PCC6803

Yin

Wang

Bai

et al. 2011

Water Air Soil Pollut

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Synechocysis sp. PCC6803 is a unicellular blue alga which ubiquitously exists in aquatic system and is considered to play a role in arsenic cycling. Our results showed that Synechocysis can accumulate arsenic as much as 1.0 and 0.9 gkg −1 DW when exposed to 0.5 mM arsenate and arsenite for 14 days, respectively. In addition, arsenic species in cells were assayed under different exposure conditions and it was found that inorganic arsenic, including arsenate and arsenite, is the dominant species. Organic methylated arsenicals can only be detected exposed to higher arsenic concentration range (100-500 μM). Arsenate is the dominant arsenic species and presents more than 80% of the total arsenic in cells. Efflux of both arsenate and arsenite was observed. When treated with 2.67 μM arsenite, Synechocysis can rapidly oxidize arsenite to arsenate and accumulate As rapidly. The observed arsenic oxidation in solute is solely caused by cellular oxidation. Given the robust ability of As accumulation, it can serve as a phytoremediation organism to efficiently remove arsenic from aquatic environments.

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Section: Introductionmentioning

confidence: 99%

Accumulation and Transformation of Arsenic in the Blue-Green Alga Synechocysis sp. PCC6803

Yin

Wang

Bai

et al. 2011

Water Air Soil Pollut

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“…Arsenic exposure through food poses a substantial risk to humans in certain parts of the world, particularly in Asia from the consumption of staple foods such as rice and vegetables, which have been irrigated with As-rich groundwater (Meharg et al 2009;Mondal and Polya 2008;Kile et al 2007;Smith et al 2006). However, drinking water is seen to pose the most significant risk to human health in Argentina, primarily through consumption and cooking, this is due to the various potential sources of arsenic present in the region, such as in groundwater and surface water (Nguyen et al 2009;Asante et al 2007;Ning et al 2007;Ohno et al 2007). …”

Section: Introductionmentioning

confidence: 99%

Arsenic contamination of natural waters in San Juan and La Pampa, Argentina

O'Reilly

Watts

Shaw

et al. 2010

Environ Geochem Health

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Arsenic (As) speciation in surface and groundwater from two provinces in Argentina (San Juan and La Pampa) was investigated using solid phase extraction (SPE) cartridge methodology with comparison to total arsenic concentrations. A third province, Río Negro, was used as a control to the study. Strong cation exchange (SCX) and strong anion exchange (SAX) cartridges were utilised in series for the separation and preservation of arsenite (As ). Samples were collected from a range of water outlets (rivers/streams, wells, untreated domestic taps, well water treatment works) to assess the relationship between total arsenic and arsenic species, water type and water parameters (pH, conductivity and total dissolved solids, TDS). Analysis of the waters for arsenic (total and species) was performed by inductively coupled plasma mass spectrometry (ICP-MS) in collision cell mode. Total arsenic concentrations in the surface and groundwater from Encon and the San José de Jáchal region of San Juan (north-west Argentina within the Cuyo region) ranged from 9 -357 μg l -1As. Groundwater from Eduardo Castex (EC) and Ingeniero Luiggi (LU) in La Pampa (central Argentina within the Chaco-Pampean Plain) ranged from 3 -1326 μg l -1As. The pH range for the provinces of San Juan (7.2 -9.7) and La Pampa (7.0 -9.9) are in agreement with other published literature. The highest total arsenic concentrations were found in La Pampa well waters (both rural farms and pre-treated urban sources), particularly where there was high pH (typically > 8.2), conductivity (> 2600 μS cm As. Arsenic species for both provinces were predominantly As for groundwater, respectively. This translates to a relative As III abundance of 69 -100 % of the total arsenic in surface waters and 32 -100 % in groundwater. This is unexpected because it is typically thought that in oxidising conditions (surface waters), the dominant arsenic species is As V . However, data from the SPE methodology suggests that As III is the prevalent species in San Juan, indicating a greater influence from reductive processes. La Pampa groundwater had As (equating to up to 33 % of the total arsenic). Previously published literature has focused primarily on the inorganic arsenic species, however this study highlights the potentially significant concentrations of organoarsenicals present in natural waters. The potential for separating and preserving individual arsenic species in the field to avoid transformation during transport to the laboratory, enabling an accurate assessment of in-situ arsenic speciation in water supplies is discussed.

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“…[1][2][3][4][5][6][7] Similar problems have been observed in Latin America. Highly As concentrations have been detected in groundwater of Mexico, Chile, Argentina, [6,8,9] and recently in Uruguay, Colombia, Guatemala, Costa Rica, Cuba and Venezuela.…”

Section: Introductionmentioning

confidence: 77%

Natural contamination with arsenic and other trace elements in groundwater of the Central–West region of Chaco, Argentina

Blanes¹,

Buchhamer

Giménez

2011

Journal of Environmental Science and Health, Part A

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This study covered the central agricultural region of the Chaco province, which lacks a permanent river networks. However, during the rainy period there is localized groundwater recharge. About 84 groundwater samples were taken during the period April-December 2007. These groundwater samples were collected from two different depths: 62 samples from shallow wells (4 to 20 m) and 24 samples from deep wells (20 to 100 m). Chemical variables were determined: pH, specific conductance, total dissolved solid, hardness, alkalinity, HCO(3)-, CO(3)(2-), SO(4)(2-), Cl-, NO(3)-, NO(2) -, NH(4)+, F-, As((tot)), Na+, K+, Ca2+, Mg2+, Fe, Cu, Ni, Pb and Zn. The chemical composition of groundwater in the study area is dominantly sodium bicarbonate and sodium chloride bicarbonate, comprising more than 60% (52/86) of shallow and deep groundwater samples. Of the 86 analyzed groundwater samples, 88% exceeded the WHO (World Health Organization) and CAA (Código Alimentario Argentino) standards (10 μg/L) for As (arsenic) and 9% exceeded the WHO standard (1.5 mg/L) for F(-).Groundwater highly contaminated with As (max. 1,073 μg/L) and F- (max. 4.2 mg/L) was found in shallow aquifer. The contaminated groundwater is characterized by high pH (max. 8.9), alkalinity (max. HCO(3)- 1,932 mg/L), SO(4)(2-) (max. 11,862 mg/L), Na(+) (max. 3,158 mg/L), Cl(-) (max. 10,493 mg/L) and electric conductivity greater than 33.3 μS/cm. Other associated elements (Ni, Pb, Cu and Zn) are present in low concentrations, except for Fe that in 32% of samples exceeded the guideline value of 0.3 mg/L suggested by the CAA.

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Residential exposure to drinking water arsenic in Inner Mongolia, China

Cited by 40 publications

References 13 publications

Accumulation and Transformation of Arsenic in the Blue-Green Alga Synechocysis sp. PCC6803

Accumulation and Transformation of Arsenic in the Blue-Green Alga Synechocysis sp. PCC6803

Arsenic contamination of natural waters in San Juan and La Pampa, Argentina

Natural contamination with arsenic and other trace elements in groundwater of the Central–West region of Chaco, Argentina

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