Fe_3O_4磁性石墨烯分散固相萃取水中的有机氯污染物

Fe_3O_4 magnetic dispersive solid-phase extraction with graphene for determination of organochlorine pesticides contaminants in water

开发负载胶束的磁性Fe_3O_4纳米微粒修饰的石墨烯作为新型分散固相萃取材料,并用于水中有机氯的检测。磁性石墨烯由氧化石墨烯和Fe^(2+)通过氧化还原法一步合成,负载阳离子表面活性剂CTAB形成纳米混合胶束作为提取系统。应用本方法分析水中的29种有机氯,检测限达到1.5~5.0 ng/L,样品加标回收率范围在75.22%~97.15%。复重性的相对标准偏差小于9.995%,与传统的固相萃取法相比,方法的灵敏度提高了50~113倍。该方法快速、灵敏、准确,可以同时测定水中多种有机氯农残,适合于大批量样品的测定。

A novel dispersive solid-phase extraction（ DSPE） analysis method was established by combining Fe3O4 magnetic nanoparticles modified graphene as absorption material for determination of organochlorine pesticides（ OCPs） in water. Magnetic nanoparticles modified graphene（ MNG） was prepared by graphene oxide and Fe2＋ through redox reaction in one step. Cationic surfactant CTAB was added as micelle forming agent,in which MNG was carrier of mixed micelles extraction system. Mixed micelle modified MNG had higher loading capacity than pure Fe_3O_4 magnetic graphene. This method was applied to detect 29 kinds of OCPs in water. The detection limit was in the range of 1. 5 ~ 5. 0 ng/L. The recovery was ranged from 75. 22% to 97. 15%. The relative standard deviation（ RSD）of repeatability was lower than 9. 995%. As compared with ordinary solid-phase extraction,the sensitivity of newmethod increased 50 ~ 113 times. The method was suitable for simultneous determination of OCPs pesticide residues in water with high accuracy,sensitivity and less pre-treatment time,which was suitable for batch analysis of samples.