Spatial variability of arsenic concentration in soils and plants, and its relationship with iron, manganese and phosphorus

被引:83
作者
Hossain, M. B. [2 ]
Jahiruddin, M. [1 ]
Panaullah, G. M. [3 ]
Loeppert, R. H. [4 ]
Islam, M. R. [1 ]
Duxbury, J. M. [5 ]
机构
[1] Bangladesh Agr Univ, Dept Soil Sci, Mymensingh 2202, Bangladesh
[2] Bangladesh Inst Nucl Agr, Soil Sci Div, Mymensingh 2200, Bangladesh
[3] CIMMYT Bangladesh, Dhaka 1230, Bangladesh
[4] Texas A&M Univ, Dept Soil & Crop Sci, College Stn, TX 77843 USA
[5] Cornell Univ, Dept Crop & Soil Sci, Ithaca, NY 14853 USA
关键词
Water arsenic; Soil arsenic; Rice arsenic; Iron oxide; Phosphorus;
D O I
10.1016/j.envpol.2008.06.015
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
Spatial distribution of arsenic (As) concentrations of irrigation water, soil and plant (rice) in a shallow tube-well (STW) command area (8 ha), and their relationship with Fe, Mn and P were studied. Arsenic concentrations of water in the 110 m long irrigation channel clearly decreased with distance from the STW point, the range being 68-136 mu g L-1. Such decreasing trend was also noticed with Fe and P concentrations, but the trend for Mn concentrations was not remarkable. Concerning soil As, the concentration showed a decreasing tendency with distance from the pump. The NH4-oxalate extractable As contributed 36% of total As and this amount of As was associated with poorly crystalline Fe-oxides. Furthermore only 22% of total As was phosphate extractable so that most of the As was tightly retained by soil constituents and was not readily exchangeable by phosphate. Soil As (both total and extractable As) was significantly and positively correlated with rice grain As (0.296 +/- 0.063 mu g g(-1), n = 56). Next to drinking water, rice could be a potential source of As exposure of the people living in the As affected areas of Bangladesh. (C) 2008 Elsevier Ltd. All rights reserved.
引用
收藏
页码:739 / 744
页数:6
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