The development of methods for the determination of residues of the herbicide halauxifen-methyl in barley and rape

  • Mikhail F. Zayats Institute of Plant Protection, 2 Mira Street, Pryluki 223011, Minsk district, Belarus
  • Sergey M. Leschev Belarusian State University, 4 Niezaliežnasci Avenue, Minsk 220030, Belarus
DOI: https://doi.org/10.33581/2520-257X-2019-1-59-65

Abstract

Optimal conditions for the extraction of halauxifen-methyl from grain, straw and green mass of barley; seeds, oil and green mass of rape, as well as the conditions for the purification of extracts were selected on the basis of the distribution constants (P) and distribution coefficients (D) experimentally determined at a temperature of (20 ± 1) °C. At the first stage, acetonitrile, or acidified acetonitrile, or a mixture of water and acetonitrile were used to extract the pesticide. Halauxi fen-methyl was found to be a weakly hydrophobic substance and it exhibits the properties of a weak base in aqueous solutions. For the purification of plant material extracts hexane – 1 mol/L aqueous solution of hydrochloric acid and hexane – 10 % K2HPO4 aqueous solution were successfully used (to neutralize the acid and increase the extraction constant due to the salting out effect). The samples obtained after purification are sufficiently pure. So, the residual amounts of halauxifen-methyl can be determined by widespread liquid chromatography with diode array (ultraviolet) detection at the level, which is equal or lower to the maximum allowable content of herbicide in barley and rape.

Author Biographies

Mikhail F. Zayats, Institute of Plant Protection, 2 Mira Street, Pryluki 223011, Minsk district, Belarus

PhD (chemistry); leading researcher at the laboratory of pesticide dynamics

Sergey M. Leschev, Belarusian State University, 4 Niezaliežnasci Avenue, Minsk 220030, Belarus

doctor of science (chemistry), full professor; professor at the department of analytical chemistry, faculty of chemistry

References

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Published
2019-02-15
Keywords: solvent extraction, halauxifen-methyl, sample preparation method, liquid chromatography, barley, rape
How to Cite
Zayats, M. F., & Leschev, S. M. (2019). The development of methods for the determination of residues of the herbicide halauxifen-methyl in barley and rape. Journal of the Belarusian State University. Chemistry, 1, 59-65. https://doi.org/10.33581/2520-257X-2019-1-59-65
Issue
No 1 (2019): Journal of the Belarusian State University. Chemistry
Section
Original Articles

Copyright (c) 2019 Journal of the Belarusian State University. Chemistry

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