HYGIENIC EVALUATION OF A NEW ACTIVE INGREDIENT CYCLOXIDIM BEHAVIOR IN THE ENVIRONMENTAL OBJECTS

Abstract

Relevance. Sunflower plants are very demanding for the soil and require optimal moisture, especially for the development phase of 2-3 pairs of leaves. It is important to use herbicides at this stage of vegetation as weeds can lead to impoverishment of soil and nutrients, and contribute to the development of pests and diseases.
 Objective of the work is the hygienic assessment of the behavior of the new herbicide Stratos Ultra in the objects of the environment and the justification of the hygienic norms of its active substance cycloxydim in sunflower seeds and soils.
 Materials and methods. Natural research was conducted on the basis of the «Kremenne» farm in the Kyiv region, Brovarsky district, p. Gogoliv. The stability of cycloxydim in soils and plants was estimated according to the calculated half-life (τ50) and almost complete destruction (τ95) of the substance periods. Mathematical processing of the results obtained in the program Microsoft Excel.
 Results. After treatment initial concentrations of the cycloxydim in the soil and green mass of plants were 0,43±0,07 mg/kg and 0,5±0,04 mg/kg, respectively. At the same time, in the soil-climatic conditions of Ukraine, τ50 in the field conditions is on average 8 days (7,57-8,90 days), τ95 – 35 days (35,37-38,97 days), in other European countries cycloxydim τ50 is on average 5 days (1-10 days), and τ50 of the main metabolite – cycloxydim-sulfoxide (ВН 517-ТСО) – 16 days. MAC in water of water reservoirs – 0,06 mg/dm3.
 Conclusions. Cycloxydim can be attributed to the IV class (low hazardous), for resistance to water – to the first class of danger. Approximately acceptable concentration in the soil is grounded at the level of 0,3 mg/kg. Based on the results of the determination of the actual content of cyclooxydim in sunflower seeds, The maximum acceptable level in sunflower seeds is 0,4 mg/kg, and for sunflower oil is not substantiated.