Analytical control optimization of residues fungicides from the class of pyrazole carboxamides in water
DOI:
https://doi.org/10.11603/mcch.2410-681X.2017.v0.i3.8203Keywords:
fungicides, high-performance liquid chromatography, water.Abstract
Introduction. Over the past few years, fungicidal formulations based on fluxapyroxad, penthiopyrad, isopyrazam and sedaxan have been proposed in the world market. Such pesticides meet modern requirements and are recommended in the world to protect more than 30 major crops. Given the wide range of crops for which these preparations are offered, as well as the anti-drug strategy for the pesticides application, which involves the use of substances with a new mechanism of action and the introduction of combined formulations based on two or more active substances, it is possible to actively use pyrazolecarboxamides in one region, that is why there is a possibility of their simultaneous arrival in environmental objects.
The aim ofthe study– to develop a methodology for the analytical determination of fluxapyroxad, penthiopyrad, isopyrazam and sedaxanin their joint presence in water.
Materials and Methods. Chromatographic analysis was performed on liquid chromatographs LC-10ADvp and LC-20AD from Shimadzu (Japan) with ultraviolet detection.
Results and Discussion. It was found that the C18 column is more promising for solving the problem of pyrazolecarboxamidesseparation under study. The gradient regime in the eluent system was recognized as optimal: A (acetonitrile), B (methanol) and C (bidistilled water). The retention time (min) is: for fluxapyroxad– 6.8±0.1; trans-sedaxan– 7.4±0.1; cis-sedaxane– 8.2±0.1; penthiopyrad– 9.3±0.1 and isopyrazam– 11.0 ± 0.1.
Conclusions. The conditions for the simultaneous determination of fluxapyroxad, penthiopyrad, isopyrazam and sedaxanby the high-performance liquid chromatography method with their simultaneous presence in water sample wasdeveloped.It makes it possible to significantly accelerate the analysis and reduce the costs of conducting it.
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