FIELD: medicinal technique. SUBSTANCE: invention relates to an agent for determination of heavy metal ions. Biosensor consists of biochemical reagent that is able to induce chemical reaction in the presence of metal ions and a transformer that is able to detect the end agent to be transformed and formed directly or indirectly by reaction induced by biochemical reagent in the presence of metal ions. Biochemical reagent has an enzyme which is a reductase for metal to be detected. Indicated metal ions can be taken among the group including ions of mercury, chrome, arsenic, technetium, copper, silver, gold, selenium, vanadium, molybdenum and uranium. Reductase can be used with coenzymes in biochemical chain reaction, for example, nicotinamide coenzyme NADP and luciferase coenzyme that emits light. EFFECT: broadened pattern of agents for assay of heavy metal ions in environment. 13 cl, 7 dwg, 4 ex
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