Analysis of Imazaquin in Soybeans by Solid-phase Extraction and High-performance Liquid Chromatography | Zendy

Cheng Guo | Zendy; Jiye Hu | Zendy; X. -Y. Chen | Zendy; J. -Z. Li | Zendy

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Analysis of Imazaquin in Soybeans by Solid-phase Extraction and High-performance Liquid Chromatography

Author(s) -

Cheng Guo,

Jiye Hu,

X. -Y. Chen,

J. -Z. Li

Publication year - 2008

Publication title -

bulletin of environmental contamination and toxicology

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.543

H-Index - 70

eISSN - 1432-0800

pISSN - 0007-4861

DOI - 10.1007/s00128-007-9340-2

Subject(s) - chromatography , chemistry , solid phase extraction , residue (chemistry) , phosphoric acid , extraction (chemistry) , matrix (chemical analysis) , sample preparation , detection limit , mass spectrometry , biochemistry , organic chemistry

An analytical method for the determination imazaquin residues in soybeans was developed. The developed liquid/liquid partition and strong anion exchange solid-phase extraction procedures provide the effective cleanup, removing the greatest number of sample matrix interferences. By optimizing mobile-phase pH water/acetonitrile conditions with phosphoric acid, using a C-18 reverse-phase chromatographic column and employing ultraviolet detection, excellent peak resolution was achieved. The combined cleanup and chromatographic method steps reported herein were sensitive and reliable for determining the imazaquin residues in soybean samples. This method is characterized by recovery >88.4%, precision <6.7% CV, and sensitivity of 0.005 ppm, in agreement with directives for method validation in residue analysis. Imazaquin residues in soybeans were further confirmed by high performance liquid chromatography-mass spectrometry (LC-MS). The proposed method was successfully applied to the analysis of imazaquin residues in soybean samples grown in an experimental field after treatments of imazaquin formulation.

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