Analytical Sciences

Extraction of Imide Fungicides in Water and Juice Samples Using Magnetic Graphene Nanoparticles as Adsorbent Followed by Their Determination with Gas Chromatography and Electron Capture Detection

Zhi LI,* Mengying HOU,* Shasha BAI,** Chun WANG,* and Zhi WANG*

*Department of Chemistry, College of Science, Agricultural University of Hebei, Baoding 071001, P. R. China
**College of Food Science & Technology, Agricultural University of Hebei, Baoding 071001, P. R. China

In this paper, a sensitive analytical method for four fungicides (procymidone, folpet, vinclozolin and ditalimfos) in environmental water and juice samples was developed by using magnetic solid-phase extraction (MSPE) with magnetic graphene nanocomposite (G-Fe₃O₄) as the adsorbent, followed by determination with gas chromatography and electron capture detection. Parameters such as the amount of G-Fe₃O₄, extraction time, ionic strength and pH of the sample solution, desorption solvent and desorption time were optimized. Under the optimum conditions, the enrichment factors of the method for the analytes were in the range from 1495 to 1849. The limits of detection for the fungicides ranged from 1.0 to 7.0 ng L⁻¹. The recoveries of the method for the analytes were in the range from 79.2 to 102.4%. The developed G-Fe₃O₄-MSPE method was simple and efficient for the extraction and determination of the four fungicides in water and grape juice samples.

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