title: Development of a field sampling method based on magnetic nanoparticles for the enrichment of pesticides in aqueous samples.
abstract: A field sampling method based on magnetic core-shell silica nanoparticles was developed for field sampling and the enrichment of low concentrations of pesticides in aqueous samples. The magnetic nanoparticles could be easily extracted from water samples by a custom-made magnetic nanoparticle collector. The recovery of 15 mg of magnetic particles from a 500 mL water sample was 90.8%. Mixtures of seven pesticides spiked into pure water and pond water were used as marker samples to evaluate the field sampling method. The average recoveries at three levels of spiking were in the range 60.0-104.7% with relative standard deviations <7.1%. The proposed method has good linearity with a correlation coefficient >0.9990 in the concentration range 0.5-15 μg L(-1). The results of the analysis of a sample of poisoned pond water indicate that this method is fast, convenient and efficient for the field sampling and enrichment of pesticides in aqueous samples.
authors.affiliation: Shanghai Key Laboratory of Functional Materials Chemistry, Department of Chemistry and Molecular Engineering, East China University of Science and Technology, Shanghai 200237, P. R. China. weibingzhang@ecust.edu.cn.
authors.forename: Lingyi
authors.initials: L
authors.lastname: Zhang
authors.forename: Xiaoling
authors.initials: X
authors.lastname: Sheng
authors.forename: Runsheng
authors.initials: R
authors.lastname: Zhang
authors.forename: Zhichao
authors.initials: Z
authors.lastname: Xiong
authors.forename: Zhongping
authors.initials: Z
authors.lastname: Wu
authors.forename: Songmao
authors.initials: S
authors.lastname: Yan
authors.forename: Yurong
authors.initials: Y
authors.lastname: Zhang
authors.forename: Weibing
authors.initials: W
authors.lastname: Zhang
mesh_terms: D005591:Chemical Fractionation / Q000295:instrumentation / Q000379:methods; D004784:Environmental Monitoring; D060328:Magnetic Phenomena; D053768:Metal Nanoparticles / Q000737:chemistry*; D010575:Pesticides / Q000737:chemistry*; D014867:Water / Q000737:chemistry*; D014874:Water Pollutants, Chemical / Q000737:chemistry
chemical_list: D010575:Pesticides; D014874:Water Pollutants, Chemical; D014867:Water