FIELD: analytical methods. SUBSTANCE: method of determining microquantities of heavy metals (Cd, Cu, Co, Ni, Zn) in natural water and waste waters consists in sorption of metals by fine synthetic calcium hydrosilicate at weight ratio of the latter to sample 1:(2000-2200). EFFECT: increased degree of concentration of metals and speeded up their coprecipitation. 4 tbl, 3 ex
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