Russia) Mezhdunarodnai︠a︡ nauchno-prakticheskai︠a︡ konferent︠s︡ii︠a︡ "Biogeokhimii︠a︡ elementov i soedineniĭ toksikantov v subsratnoĭ i pishchevoĭ t︠s︡epi︠a︡kh agro- i akvalʹnykh sistem" (2007 Ti︠u︡menʹ