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@@ Study of ecology and biogeochemistry is helpful for understanding ecologicaltoxicology of As,Cd,Hg,Pb and Cr.Anthropogenic activities,such as mineexploitations,contaminate usually a large amount of water,soil and farmlands.Toxicelements from them wiU enter eventually plants and food chains,and cause damagesto human health.Dietary intake ofthe toxic metals has also a great impact on humanhealth.