Arsenic in shallow groundwater of Bangladesh: investigations from three different physiographic settings

被引:120
|
作者
Hasan, M. Aziz
Ahmed, K. Matin
Sracek, Ondra
Bhattacharya, Prosun [1 ]
Von Broemssen, Mattias
Broms, Sandra
Fogelstroem, Johan
Mazumder, M. Lutful
Jacks, Gunnar
机构
[1] Royal Inst Technol, Dept Land & Water Resources Engn, KTH Int Groundwater Arsen Res Grp, S-10044 Stockholm, Sweden
[2] Univ Dhaka, Dept Geol, Dhaka 1000, Bangladesh
[3] Masaryk Univ, Fac Sci, Inst Geol Sci, Brno 61137, Czech Republic
关键词
arsenic; alluvial and deltaic aquifers; hydrochemistry; redox-buffering; Bangladesh;
D O I
10.1007/s10040-007-0203-z
中图分类号
P [天文学、地球科学];
学科分类号
07 ;
摘要
Occurrences of arsenic (As) in the Bengal Basin of Bangladesh show close relationships with depositional environments and sediment textures. Hydrochemical data from three sites with varying physiography and sedimentation history show marked variations in redox status and dissolved As concentrations. Arsenic concentration in groundwater of the Ganges Flood Plain (GFP) is characteristically low, where high Mn concentrations indicate redox buffering by reduction of Mn(IV)-oxyhydroxides. Low DOC, HCO3-, NH4+ and high NO3- and So(4)(2-) concentrations reflect an elevated redox status in GFP aquifers. In contrast, As concentration in the Ganges Delta Plain (GDP) is very high along with high Fe and low Mn. In the Meghna Flood Plain (MFP), moderate to high As and Fe concentrations and low Mn are detected. Degradation of organic matter probably drives redox reactions in the aquifers, particularly in MFP and GDP, thereby mobilising dissolved As. Speciation calculations indicate supersaturation with respect to siderite and vivianite in the groundwater samples at MFP and GDP, but groundwater in the GFP wells is generally supersaturated with respect to rhodochrosite. Values of log P-CO2 at MFP and GDP sites are generally higher than at the GFP site. This is consistent with Mn(IV)-redox buffering suggested at the GFP site compared to Fe(III)-redox buffering at MFP and GDP sites.
引用
收藏
页码:1507 / 1522
页数:16
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