Distribution of arsenic and other trace elements in the Holocene sediments of the Meghna River Delta, Bangladesh

被引:24
作者
Bibi, M. Hawa [1 ]
Ahmed, Faruque [1 ]
Ishiga, Hiroaki [1 ]
机构
[1] Shimane Univ, Dept Geosci, Matsue, Shimane 6908504, Japan
来源
ENVIRONMENTAL GEOLOGY | 2006年 / 50卷 / 08期
关键词
Meghna River Delta; arsenic; sediment; groundwater; Bangladesh;
D O I
10.1007/s00254-006-0298-x
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
Geochemical study of the Holocene sediments of the Meghna River Delta, Chandpur, Bangladesh was conducted to investigate the distribution of arsenic and related trace and major elements. The work carried out includes analyses of core sediments and provenance study by rare earth element (REE) analysis. Results showed that the cores pass downward from silty clays and clays into fine to medium sands. The uppermost 3 m of the core sediments are oxidized [average oxidation reduction potential (ORP) + 230 mV], and the ORP values gradually become negative with depths (-45 to -170 mV), indicating anoxic conditions prevail in the Meghna sediments. The REE patterns of all lithotypes in the study areas are similar and are comparable to the average upper continental crust. Arsenic and other trace elements (Pb, Zn, Cu, Ni, and Cr) have greater concentrations in the silts and clays compared to those in the sands. Positive correlation between As and Fe was found in the sediments, indicating As may be adsorbed on Fe oxides in aquifer sediments.
引用
收藏
页码:1243 / 1253
页数:11
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