Оптимізація аналітичного контролю залишкових кількостей фунгіцидів цифлуфенаміду та дифеноконазолу у воді

Abstract

Introduction. Annually, the assortment and application rates of pesticides are supplemented with new compounds of various chemical classes. Methods for the determination of active substances in water by the method of gas-liquid chromatography are known to provide for the determination of only one fungicide, which is quite costly. Therefore, it remains an actual goal to develop a method that will simultaneously identify different substances in one sample. Such a technique allows significantly increasing the speed of one definition and reducing the cost of conducting it. Such a method has not only economic but also ecological significance, since it can be effectively used for monitoring environmental studies.The aim of the study – to development a technique for the analytical determination of cyflufenamide and difenoconazole microquantities in water simultaneously.Research Methods. Research includes extraction, concentration and chromatography of prepared water samples. The quantitative determination of cyflufenamide and difenoconazole was carried out by gas-liquid chromatography using an electron-capture detector.Results and Discussion. The best result of active substances extraction from water samples was achieved using chloroform as an extractant. Chromatography conditions were established under which the retention time is: for cyflufenamide – 3.19 minutes; difenoconazole – 12.58 minutes. Limit of the quantification of this method for cyflufenamide is 0.001 mg/dm3, difenoconazole – 0.001 mg/dm3.Conclusions. The conditions for simultaneous determination of cyflufenamide and difenoconazole by the method of gas-liquid chromatography are developed with their simultaneous presence in the water sample, which allows significantly speeding up the analysis and reducing the cost of conducting it.