ЧУВСТВИТЕЛЬНОСТЬ ТЕСТ-ОРГАНИЗМОВ К МИНЕ- РАЛЬНЫМ ФОРМАМ АЗОТА
SENSITIVITY OF TEST-ORGANISMS TO MINERAL NITROGEN FORMS

Summary/Abstract: Modeling of the natural drinking water pollution with mineral forms of nitrogen (ammonium ions, nitrate ions, nitrite ions) was carried out. The modeled waters were tested using D. magna, C. affinis, P. caudatum, the “Ecolum” test system to determine the series of sensitivity of test-organisms to nitrogen contamination. It is shown that 5 and 10 MPC of all nitrogen forms studied did not exert acute toxic effect on D. magna, but significantly inhibited the fecundity of individuals after 24 days of the experiment. In the bioassay on the oppression of the fertility of C. affinis, the effect of similar doses of nitrate and nitrite ions was more significant: a decrease in the index up to 3,8 times was observed. The effect of ammonium ions at doses of 5 and 10 MPC for C. affinis was lethal. In the dose range of 25–100 MPC, the effects for the lower crustaceans D. magna and C. affinis were lethal according to the acting ion. For bacteria “Ecolum” 5 and 10 MPC, nitrate and nitrite ions exerted a stimulating effect on the bioluminescence, and only the action of ammonium ions significantly inhibited the test function (group III toxicity).

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