Mobilization of arsenic from subsurface sediments by effect of bicarbonate ions in groundwater

Anawar, Hossain M.; Akai, Junji; Sakugawa, Hiroshi

doi:10.1016/j.chemosphere.2003.08.030

Cited by 226 publications

(103 citation statements)

References 26 publications

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“…Bicarbonate likely acts as a major arsenic leaching agent [36]. Bicarbonate ions may create a complex with FEOOH, replacing As from the surface of the sediments and minerals, leading to arsenic release in the groundwater [37]. In the present study, arsenic and bicarbonate show a positive correlation (r = 0.33) (Table 2), which could also be a reason for arsenic dissociation.…”

Section: Principal Component Analysissupporting

confidence: 48%

Evaluation of Water Quality for Drinking and Agricultural Suitability in the Lower Indus Plain in Sindh Province, Pakistan

Shahab

Rashid

et al. 2016

Pol. J. Environ. Stud.

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Indus Basin represents a conjunctive system for ground and surface water use. From it, originates the world's largest irrigation system underlain a deep alluvium and well transmissive aquifer resulting in higher water table. At present, this area is at risk of ground water aquifer contamination due to extensive agricultural activities that needs to be constantly monitored. A total of 218 ground water samples were collected across the Sindh Province and were evaluated for drinking and agricultural purpose subjected to Hydrochemical analysis. The analytical parameters were compared with WHO and Pakistan water quality standards and majority of the samples were found not potable. 62.84% of EC samples, 34.86% TDS, 43% Na ) and Cl -and HCO 3 -exceeds over SO 4 2-indicating saline water and carbonate weathering as the source of solutes in Sindh groundwater. Suitability of groundwater for drinking and agricultural purpose indicates that majority of the samples were very far from drinking water standards while few samples were considered unsuitable for agricultural purpose especially in the lower southern Sindh( Thatta, Badin and Tharparker). Proper drainage

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Section: Principal Component Analysissupporting

confidence: 48%

Evaluation of Water Quality for Drinking and Agricultural Suitability in the Lower Indus Plain in Sindh Province, Pakistan

Shahab

Rashid

et al. 2016

Pol. J. Environ. Stud.

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“…Reductive dissolution of oxide minerals in reducing environments due to microbial activities is widely accepted as a principal mechanism for As release (Oremland and Stolz, 2003;Islam et al, 2004). In addition, competitive ions such as phosphate and silicate may promote As release (Hongshao and Stanforth, 2001;Anawar et al, 2004). Therefore, the fate of groundwater As depends on complex biogeochemical processes and may be quite different in various geological formations (Mukherjee et al, 2009).…”

Section: Introductionmentioning

confidence: 99%

Comparison of arsenic geochemical evolution in the Datong Basin (Shanxi) and Hetao Basin (Inner Mongolia), China

Luo

Cui

et al. 2012

Applied Geochemistry

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a b s t r a c tInsightful knowledge of geochemical processes controlling As mobility is fundamental to understanding the occurrence of elevated As in groundwater. A comparative study of As geochemistry was conducted in the Datong Basin (Shanxi) and Hetao Basin (Inner Mongolia), two strongly As-enriched areas in China.The results show that As concentrations ranged from <1-1160 lg L À1 (n = 37) in the Datong Basin and <1-804 lg L À1 (n = 62) in the Hetao Basin. The groundwater is of the Na-HCO 3 type in the Datong Basin and Na-Cl-HCO 3 type in the Hetao Basin. Silicate mineral weathering and cation exchange processes dominated the groundwater geochemistry in the two study areas. Principal component analysis of 99 groundwater samples using 12 geochemical parameters indicated positive correlations between concentrations of As and Fe/Mn in the Datong Basin, but no correlation of As and Fe/Mn in the Hetao Basin. Phosphate correlated well with As in the Datong Basin and Hetao Basin, suggesting phosphate competition might be another process affecting As concentrations in groundwater. High concentrations of As, Fe, and Mn occurred in the pe range À2 to À4. The results of this study further understanding of the similarities and differences of As occurrence and mobility at various locations in China.

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“…27 The peak molar IC amount in the pore water thus constitutes a 3000-fold of the peak molar arsenic amount, so it seems evident that the sorption of arsenic oxyanions to the solid soil fraction is affected by HCO 3 À . Appelo et al 42 and Anawar et al 43 indeed suggested displacement by HCO 3 À to be a main As mobilization mechanism, which has however been disputed by Radu et al 20 based on column experiments with synthetic iron oxide-coated sand. The accumulation of IC also indicates the establishment of reducing conditions regardless the presence of Fe or Mn oxide reduction.…”

Section: Relation Betweenmentioning

confidence: 99%

Presence and mobility of arsenic in estuarine wetland soils of the Scheldt estuary (Belgium)

et al. 2009

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We aimed to assess the presence and availability of arsenic (As) in intertidal marshes of the Scheldt estuary. Arsenic content was determined in soils sampled at 4 sampling depths in 11 marshes, together with other physicochemical characteristics. Subsequently, a greenhouse experiment was set up in which pore water arsenic (As) concentrations were measured 4 times in a 298-day period in 4 marsh soils at different sampling depths (10, 30, 60 and 90 cm) upon adjusting the water table level to 0, 40 and 80 cm below the surface of these soils. The As content in the soil varied significantly with sampling depth and location. Clay and organic matter seem to promote As accumulation in the upper soil layer (0-20 cm below the surface), whereas sulfide precipitation plays a significant role at higher sampling depths (20-100 cm below the surface). The As concentrations in the pore water of the greenhouse experiment often significantly exceeded the Flemish soil sanitation thresholds for groundwater. There were indications that As release is not only affected by the reductive dissolution of Fe/Mn oxides, but also by e.g. a direct reduction of As(V) to As(III). Below the water table, sulfide precipitation seems to lower As mobility when reducing conditions have been sufficiently established. Above the water table, sulfates and bicarbonates induce As release from the solid soil phase to the pore water.

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Mobilization of arsenic from subsurface sediments by effect of bicarbonate ions in groundwater

Cited by 226 publications

References 26 publications

Evaluation of Water Quality for Drinking and Agricultural Suitability in the Lower Indus Plain in Sindh Province, Pakistan

Evaluation of Water Quality for Drinking and Agricultural Suitability in the Lower Indus Plain in Sindh Province, Pakistan

Comparison of arsenic geochemical evolution in the Datong Basin (Shanxi) and Hetao Basin (Inner Mongolia), China

Presence and mobility of arsenic in estuarine wetland soils of the Scheldt estuary (Belgium)

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