Is organic matter a source or redox driver or both for arsenic release in groundwater?

Anawar, Hossain M.; Tareq, Shafi M.; Ahmed, Golam

doi:10.1016/j.pce.2013.04.009

Cited by 50 publications

(22 citation statements)

References 54 publications

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“…Similarly, mean concentration of sulphate is twice the permissible limit (250 mg/L) of WHO for drinking water Table 4. Very high sulphate content in the groundwater of study area suggests the gypsum dissolution, use of inorganic fertilizer and the recent recharge of saline water [20,21]. High concentration of sulphate in study area is consistent with the study of Mashiatullah, et al [18] in Ghizri creek which is 5.6 km away from Qayyumabad.…”

Section: Major Anionssupporting

confidence: 88%

Assessment of Groundwater Quality in Coastal Region a Case Study of Qayyumabad, Karachi, Pakistan

Khan

Raza

Fatima

et al. 2020

Asian Review of Environmental and Earth Sciences

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The aim of present study is to assess groundwater quality of Qayyumabad area for drinking purpose. Groundwater samples (n = 20) were collected from wellbores from variable depths (12-300 feet) occurring on both banks of the Malir River near study area. Water quality was assessed through estimation of physical parameters including, pH, Eh, TDS, EC, hardness, temperature, aesthetic character (taste, color and odor) and chemical parameters including major cations (Na, K, Ca, Mg), anions (Cl, NO₃, SO₄, HCO₃) and minor/trace elements (Fe, As). Data revealed that groundwater of study area has very high TDS content (range: 805-40340 mg/l) and positive Eh (-180 to +125 mV), suggesting the recent recharge. The pH varies in the range of 6.55-7.75 which comply with WHO limit (6.5-8.5) for drinking water. Major solutes varied in the order of Na (mean: 2587 mg/l) > Mg (433mg/l) > Ca (231mg/l) > K (91 mg/l) while anions in the order of Cl (mean: 3385 mg/l) > SO₄ (mean: 580 mg/l) > HCO₃ (mean: 343 mg/l) > NO₃ (11.43 mg/l). Both arsenic and iron contents occur within the WHO permissible limits except two samples which showed elevated Fe (4950 ppb) and As (100 ppb) respectively. These results suggest that groundwater in study area is unfit for drinking purpose. Principal component analysis (PCA) explained four factors where F1 suggests the salts leaching mechanism and F2 indicated anoxia prevalence due to organic matter decomposition. On the other hand, F3 confirmed water rock interaction and F4 supported the prevalence arsenic release associated with anoxia.

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Section: Major Anionssupporting

confidence: 88%

Assessment of Groundwater Quality in Coastal Region a Case Study of Qayyumabad, Karachi, Pakistan

Khan

Raza

Fatima

et al. 2020

Asian Review of Environmental and Earth Sciences

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“…However, organic/sulfide fraction of As in peat layers was higher than 1.4 mg/kg. This indicates that As content was affected by organic matter content as pointed out by Anawar et al (2013).…”

Section: Arsenic Sequential Extractionmentioning

confidence: 58%

Factors affecting arsenic content of unconsolidated sediments and its mobilization in the Ishikari Plain, Hokkaido, Japan

2017

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Arsenic (As) contamination of groundwater is often caused by As leaching from geological formations. This study focused on factors affecting As content in unconsolidated sediments by using three sediment cores in the Ishikari Plain, Hokkaido, Japan. The geochemical properties of the sediments were characterized by the chemical and mineral compositions as well as leaching experiments and sequential extractions of As. The results showed that higher As content of 4-9 mg/kg was observed in peat layers with organic matter content >10 wt%, and that higher As contents deeper than 8 m below the surface were also observed. The deeper sediments were likely to be formed in brackish water conditions due to lower weight ratios of organic carbon content to sulfur content (C/S<10). The results of the leaching experiments showed that As was mobilized at slightly alkaline region. These indicate that the distribution of As depended on the organic content in the sediments and sedimentation condition, and that the mobility of As in the sediment was affected by pH.

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“…Elevated bicarbonate (mean > 285) is reported from all three union councils where it is almost same (mean: 289 mg/L) in the UC-1 and 2 and relatively less in UC-3. Very high content of bicarbonate in the groundwater generally occur either due to carbonate mineral dissolution or organic matter decomposition (Anawar et al, 2013) in flood plain setting. Since the alluvial sediments brought by the Indus River are mainly comprised of silt and clay (non carbonate grains) the source of bicarbonate seems to be organic matter decomposition.…”

Section: Prevalence Of Anoxiamentioning

confidence: 99%

“…Strong positive loading of major ions and TDS explains intense water-sediment interaction. Similarly, significant loading of As and HCO 3 depicts organic matter decomposition due to which arsenic is being released both from organic matter itself and aquifer sediments (Anawar et al, 2013) very strong loading of Cl, SO 4 and Na indicates sewage mixing with groundwater which is triggering the arsenic release process (Cole & Ryan, 2005). The second component (F2) (19%) shows strong positive loadings of As, PO4, NO3, Fe, K coupled with strong negative association of pH, SO4 and F-.…”

Section: Principle Component Analysis (Pca)mentioning

confidence: 99%

Groundwater Arsenic Contamination in Semi-Urban Areas of Tando Muhammad Khan District: A Case Study from Deltaic Flood Plain of Sindh, Pakistan

Khan¹,

Husain²,

Bakhtiari³

et al. 2017

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An attempt has been made to assess the arsenic contamination and role of anthropogenic activities on its release in the groundwater of alluvial aquifers occurring on deltaic flood plain of Indus River. Groundwater collected from three semi-urban union councils of Tando Muhammad Khan district revealed that the groundwater has bad quality for drinking which varied in the order of UC-2 > UC-1 > UC-3. Anoxia is prevalent in the aquifers of study area which is indicated by high HCO

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Is organic matter a source or redox driver or both for arsenic release in groundwater?

Cited by 50 publications

References 54 publications

Assessment of Groundwater Quality in Coastal Region a Case Study of Qayyumabad, Karachi, Pakistan

Assessment of Groundwater Quality in Coastal Region a Case Study of Qayyumabad, Karachi, Pakistan

Factors affecting arsenic content of unconsolidated sediments and its mobilization in the Ishikari Plain, Hokkaido, Japan

Groundwater Arsenic Contamination in Semi-Urban Areas of Tando Muhammad Khan District: A Case Study from Deltaic Flood Plain of Sindh, Pakistan

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