Citation: TAO Xuemei, ZHU Hongxia, GAO Lihong, LI Renyong. Determination of glufosinate, aminomethylphosphonic acid, and glyphosate residues in farmland soil by post-column addition of alkali using high performance anion exchange chromatography-pulse amperometric detection[J]. Chinese Journal of Chromatography, ;2019, 37(9): 1004-1010. doi: 10.3724/SP.J.1123.2019.03025 shu

Determination of glufosinate, aminomethylphosphonic acid, and glyphosate residues in farmland soil by post-column addition of alkali using high performance anion exchange chromatography-pulse amperometric detection

1.
Gansu Province Environmental Monitoring Centre, Gansu, Lanzhou 730030, China;
2.
China National Environmental Monitoring Centre, Beijing 100012, China;
3.
Application Development Center, Thermo Fisher Scientific, Beijing 100085, China;
4.
Zhongke PUYAN(Beijing) Science and Technology Co., Ltd., Beijing 100027, China

Received Date: 20 March 2019

A chromatographic method was developed for the determination of glufosinate (GLUF), aminomethylphosphonic acid (AMPA), and glyphosate (GLY) in farmland soil by the post-column addition of alkali using high performance anion exchange chromatography-pulse amperometric detection. Samples were extracted with 2 mmol/L sodium hydroxide solution, then filtered through a 0.22 μm membrane, and purified by a IC-C₁₈ column and IC-Na column. Three target compounds and coexisting ions in the filtered solution were separated on an IonPacAS11-HC anion exchange column (250 mm×4 mm), and were detected by the post-column addition of alkali using pulse amperometric detection. Results showed that GLUF and GLY had good linearity in the range of 20.0-1000 μg/L, and AMPA had good linearity in the range of 5.0-400 μg/L, with correlation coefficients above 0.999. The limits of detection of GLUF, AMPA, and GLY were 0.08, 0.02, and 0.04 mg/kg, respectively, and the recoveries were in the range of 80.2%-106% with RSDs of 0.7%-5.0% (n=6). The method provides strong anti-interference, high sensitivity, and accuracy, and can be adopted simply and quickly; therefore, it is suitable for detecting the residues of GLUF, AMPA, and GLY in farmland soil.
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沈阳化工大学材料科学与工程学院沈阳 110142