Optimization of analitycal control over residues of active ingridients of modern pesticides in reservoirs water.

A highly sensitive and selective method of pyraclostrobin, boscalid, tebufenpyrad and prohexadione-calcium determination under their combined presence in water sample, using high-performance liquid chromatography was developed. On the base of mentioned active ingredients (combined fungicide Bellis, insecto-acaricide Masai and plant growth regulator Regalis) pesticides may be used in one vegetation season for fruit trees protection. Method of co-determination of these substances is based on the preparation of water samples for extraction, extraction of pyraclostrobin, boscalid, tebufenpyrad and prohexadione-calcium, concentrating of extract of substances mixtures and chromatographic deter­mination with ultraviolet detection. A distinctive feature of this method is changing of ratio of components of mobile phase (mixture of acetonitrile and 0,1 % aqueous solution of phosphoric acid) in the process of chromatographic analysis, which allowed to clearly visualize test substances in case of their joint presence in one sample. Imple­mentation of developed and patented method into practice optimizes control over application of pesticides in agri­cul­ture and their monitoring in reservoirs water by significant acceleration of analysis and reduction of expenses in its carying out