Yadav Veena, Kaur Pervinder, Kaur Paawan
Department of Chemistry, Punjab Agricultural University, Ludhiana, 141004, India.
Department of Agronomy, Punjab Agricultural University, Ludhiana, 141004, India.
Environ Monit Assess. 2017 Nov 6;189(12):613. doi: 10.1007/s10661-017-6334-3.
The present study was conducted to determine the effect of light conditions and chemical properties of water on dissipation of glyphosate. The residues of glyphosate and aminomethylphosphonic acid (AMPA) were quantified using fluorescence spectrophotometer after derivatization with 9-fluoroenylmethoxycarbonyl chloride (FMOC-Cl) and orthopthaldehyde (OPA). Average percent recoveries of glyphosate and AMPA from distilled, tap, and ground water ranged from 87.5 to 94.9, 87.3 to 93.7, and 80.6 to 92.0, respectively, with relative standard deviation less than 10%. The limit of detection and limit of quantification of glyphosate and AMPA from different water matrices ranged from 0.001 to 0.03 μg mL and 0.003 to 0.01 μg mL, respectively. The dissipation of glyphosate followed the first-order kinetics, and half-life varied from 1.56 to 14.47 and 13.14 to 42.38 days under UV and sunlight, respectively. The pH and electrical conductivity (EC) of water has differential influence on dissipation of glyphosate, and it increased with increase in pH and EC.
本研究旨在确定光照条件和水的化学性质对草甘膦消解的影响。用9-芴甲氧羰基氯（FMOC-Cl）和邻苯二甲醛（OPA）衍生化后，使用荧光分光光度计对草甘膦和氨甲基膦酸（AMPA）的残留量进行定量。草甘膦和AMPA在蒸馏水、自来水和地下水中的平均回收率分别为87.5%至94.9%、87.3%至93.7%和80.6%至92.0%，相对标准偏差小于10%。不同水基质中草甘膦和AMPA的检测限和定量限分别为0.001至0.03μg/mL和0.003至0.01μg/mL。草甘膦的消解符合一级动力学，在紫外线和阳光下的半衰期分别为1.56至14.47天和13.14至42.38天。水的pH值和电导率（EC）对草甘膦的消解有不同影响，且随pH值和EC的增加而增加。
