Li Zhi, Hou Mengying, Bai Shasha, Wang Chun, Wang Zhi
Department of Chemistry, College of Science, Agricultural University of Hebei, Baoding, P. R. China.
Anal Sci. 2013;29(3):325-31. doi: 10.2116/analsci.29.325.
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.
本文采用以磁性石墨烯纳米复合材料（G-Fe3O4）为吸附剂的磁性固相萃取（MSPE），随后通过气相色谱和电子捕获检测进行测定，建立了一种用于环境水样和果汁样品中四种杀菌剂（腐霉利、福美双、乙烯菌核利和抑菌灵）的灵敏分析方法。对G-Fe3O4用量、萃取时间、样品溶液的离子强度和pH值、解吸溶剂和解吸时间等参数进行了优化。在最佳条件下，该方法对分析物的富集因子在1495至1849之间。杀菌剂的检测限在1.0至7.0 ng L(-1)范围内。该方法对分析物的回收率在79.2%至102.4%之间。所建立的G-Fe3O4-MSPE方法用于水和葡萄汁样品中四种杀菌剂的萃取和测定，简单且高效。
