FIELD: analysis of materials. SUBSTANCE: process is implemented with the use of growing embryos and larvae of sea-urchins which serve as natural indicator of level of technogenic fouling, have high sensitivity to toxic action of radionuclides, pesticides, metals and other toxicants and is already used for laboratory determination of summary toxicity of sea water. Harmful effects of individual chemical and physical toxicants, their combinations and summary toxicity is shown in biological equivalents of strontium 90. EFFECT: objective and relatively fast obtainment of quantitative information on level of summary harmfulness of environment. 4 tbl
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