[Substantiation of cyclophos MPEL in the soil]

On the basis of studies aimed at the substantiation of MAC for cyclophos in soil it was established, that subthreshold amounts of cyclophos according to the water-migration and air-migration indexes of harmfulness equal 0.03 mg per 1 kg of absolutely dry soil, according to the general sanitary index--0.1 mg/kg. Since cyclophos destruction period in plants is relatively short (8 days), there is no danger of translocation of the pesticide from soil in amounts exceeding the maximum allowable level for cyclophos in food stuffs. The pesticide migration in the system soil-plant was not determined. The water migration and air-migration indexes are the limiting indexes of harmfulness for cyclophos. 0.03 mg/kg is recommended as the maximum allowable concentration of cyclophos in soil.