Citation: HUANG Qian, HE Man, CHEN Beibei, HU Bin. Magnetic solid phase extraction combined with gas chromatography-flame photometric detection for the determination of organophosphorus pesticides in juice samples[J]. Chinese Journal of Chromatography, ;2014, 32(10): 1131-1137. doi: 10.3724/SP.J.1123.2014.07028 shu

Magnetic solid phase extraction combined with gas chromatography-flame photometric detection for the determination of organophosphorus pesticides in juice samples

1.
Key Laboratory of Analytical Chemistry for Biology and Medicine (Ministry of Education), College of Chemistry and Molecular Sciences, Wuhan University, Wuhan 430072, China

Corresponding author: HU Bin,
Received Date: 18 July 2014

Fund Project: 国家自然科学基金项目(20975076). (20975076)

A novel method for the determination of organophosphorous pesticides (OPPs) in fresh juice samples was developed. Fe₃O₄@P(St-co-MAA) magnetic microparticles were synthesized and modified with styrene (St) and methacrylic acid (MAA) by coating St and MAA on magnetic particles and characterized by a series of techniques. The results indicated that Fe₃O₄ magnetic nanoparticles (MNPs) have been successfully modified with St and MAA. Based on the prepared Fe₃O₄@P(St-co-MAA) magnetic microparticles, a novel method of magnetic solid phase extraction (MSPE)-gas chromatography (GC)-flame photometric detection (FPD) was developed for the determination of OPPs. The extraction/desorption conditions of MSPE were optimized, and the analytical performance was evaluated under the optimal conditions. The limits of detection (LODs, S/N=3) for target OPPs were in the range of 0.013-0.305 μg/L with the RSDs (n=7) ranging from 3.1% to 8.8%. The enrichment factors varied from 406 to 951. The linear ranges were over three orders of magnitudes (R²>0.99) and the reproducibilities were 7.4%-14.5% (n=5). Finally, the proposed MSPE-GC-FPD method was successfully applied to the analysis of the five OPPs in fresh tomato and strawberry juice samples, with the recoveries of target OPPs in the range of 85.4%-118.9% for the spiked samples. The proposed MSPE-GC-FPD method is featured with low cost, fast separation and high enrichment factor.
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沈阳化工大学材料科学与工程学院沈阳 110142