Optimization of the analytical control in the water of the residues of the potato protection system pesticides
DOI:
https://doi.org/10.11603/mcch.2410-681X.2018.v0.i2.9143Keywords:
insecticides, fungicides, herbicides, the method of reverse-phasehigh-performance liquid chromatography, the limit of quantitative determination.Abstract
Introduction. One of the main agricultural crops of Ukraine is the potato – the most favorite and indispensable food product for millions of our compatriots. One of the most important conditions for the integrated protection of crops is the control of the correct pesticide formulations application, the element of which is to determine the content of their active substances in the objects of the environment.
The aim of the study – to develop a method for the analytical determination of thiamethoxam, imidacloprid, metrubuzine, dimetomorph, azoxystrobin, oxathiapiproline and famoxadone in water in their co-presence.
Research Methods. The method of reverse-phase high-performance liquid chromatography with ultraviolet detection was used. Statistical processing of the results was carried out using the package of statistical programs IBM SPSS Statistics Base v.22 and MS Excel.
Results and Discussion. As a result of the conducted laboratory researches, the most optimal chromatographic conditions were selected, including mobile phase (acetonitrile + water in the ratio (50+50) and (70+30)) using gradient elution. The optimal wavelength for the research was 245 nm. The retention time (min) for: thiamethoxamis 3.5±0.1; imidacloprid – 4.1±0.1; metrubuzin – 6.3±0.1; E isomer of dimethomorph – 8.5±0.1; Z isomer of dimethomorph – 8.9±0.1; azoxystrobin – 9.5±0.1; oxathiapiroline – 10.2±0.1 and famoxadone – 12.1±0.1. We developed the optimal conditions for the chromatographic determination of thiamethoxam, imidacloprid, metribuzin, dimethomorph, azoxystrobin, oxathiapiproline and famoxadone in a joint presence in the water sample: wavelength – 245 nm, gradient elution conditions selected for different gradient profiles of the two components of the mobile phase, acetonitrile and water 50+50; 70+30; 50+50).
Conclusion. The optimal conditions of extraction and chromatography of the studied substances at a copresence in the water sample provide control of their content with a limit of quantitative determination of each compound of 0.0002 mg/dm3.
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