GLYPHOSATE AND AMINOMETHYLPHOSPHONIC ACID LEVELS IN WATER AND SOIL SAMPLES FROM TRANSYLVANIAN ROMA COMMUNITY ANALYZED BY HPLC-FLD METHOD
DOI:
https://doi.org/10.24193/subbchem.2022.4.18Keywords:
Glyphosate, aminomethylphosphonic acid, water, soil, FMOC-Cl, RP-HPLC-FLD.Abstract
This paper purpose was to develop a sensitive and selective method for the determination of glyphosate, and aminomethylphosphonic acid (AMPA) residues in water and glyphosate from soil samples. The method involves a derivatization step with 9-fluorenylmethylchloroformate in borate buffer of these compounds and liquid chromatography separation with fluorescence detection (HPLC-FLD). Separation of derivatized glyphosate and AMPA compounds was performed on an Agilent ZORBAX C18 reversed-phase column. The mobile phase consisted of a mixture of acetonitrile and 0.05 M KH2PO4 solution [30:70 v/v]. Limits of detection (LOD) was 0.28 µg L-1 for glyphosate, and 0.35 µg L-1 for AMPA, and limits of quantification (LOQ) was 0.84 µg L-1 for glyphosate and 1.05 µg L-1 for AMPA. The method has been validated for surface water and soil by recovery studies with samples spiked at 25 and 5 µg L-1. In water samples, the mean recoveries values ranged between 86.44 - 103.9% for glyphosate, and 71.27 - 99.08% for AMPA. The mean recoveries values for glyphosate ranged from 57 - 81.5% in soil samples. The developed method has been applied for determination of these compounds in water and soil samples from agricultural and rural areas of Roma community from some Transylvania Counties.
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