Arsenic mobilisation in rice paddy soils irrigated with As-contaminated water: A synopsis of case studies from West-Bengal, India
Elevated arsenic concentration in potable and irrigation water extracted from wells has become a world wide health problem to millions of peoples, especially in delta regions of large rivers, like in the Bengal Delta Plain (BDP). This paper presents results of several case-studies on As fluxes based on the distribution, speciation and mobility of As in the soil of rice paddies of the BDP in order to evaluate the influence of irrigation with As-rich groundwater on soil and plant. Especially Fe containing root plagues play an important role in the fixation and release of As in soils. Although no critical or even significantly increased concentrations of As could be documented in consumable parts of plants, results indicate that irrigation with high As water could be still problematic,leading to a relative rapid accumulation of As in agricultural soils. The non-critical As concentrations in rice and wheat corn as found in this study can not be generalized and have to be assessed in connection with the total daily dietary. Specific monitoring studies have to be carried out in any area affected by As contaminated irrigation and potable water to assess the specific As pathways and to efficiently protect the health of the population.
D.Stüben St.Norra Z.Berner U, Kramar M.Kiczka P.Agarwala D.Chandrasekharam R.Rout
Institut für Mineralogie und Geochemie, Universitat Karlsruhe, Germany Institute of Terrestrial Ecology, ETH Zürich, Switzerland Department of Earth Sciences, Indian Institute of Technology, Mumbai, India
国际会议
第十二届水-岩相互作用国际研讨会(P0roceedings of the 12th International Symposium on Water-Rock Interaction)
昆明
英文
1507-1511
2007-07-31（万方平台首次上网日期，不代表论文的发表时间）