title: Simultaneous determination of organotin pesticides by HPLC-ICP-MS and their sorption, desorption, and transformation in freshwater sediments.
abstract: In order to better assess their environmental risks, the sorption and degradation of triphenyltin hydroxide, azocyclotin and fenbutatin oxide were studied in two sediments under varying laboratory conditions in this study. An analytical method for simultaneous determination of the three organotins in environmental samples was firstly developed using high performance liquid chromatography-inductively coupled plasma-mass spectrometry (HPLC-ICP-MS). The limit of detection and limit of quantification for standards ranged from 0.13 to 1.46 μg/L. Fortification study showed that when spiked at 2-250 μg/kg the mass recoveries were 73.7-119.6%. Sorption isotherm experiments indicated that the organotins could be strongly adsorbed by the sediments, and organotin sorption kinetics obeyed the pseudo second-order kinetic model. The sorption affinity was inversely related to their water solubility. All isotherms fitted with the Henry mode fairly well (r(2) > 0.96) with distribution coefficients (Kd) ranging from 746.1 to 2465.2 mL/g. The three organotins could rapidly move from the upper water layer to the lower sediment layer, and they were all of moderate degradation compounds with the degradation half lives varying from 38.3 to 84.5d in anaerobic and aerobic water-sediment systems. The degradation rate seemed to be positively related to organic matter content of sediment. Result inferred that the three organotins had the low risks to pollute groundwater when applied on dry land and could moderately degrade in water-sediment system. However, more attention should still be paid to these organotins due to the wide application on agricultural field.
authors.affiliation: Institute of Pesticide and Environmental Toxicology, Zhejiang University, Hangzhou 310058, PR China; Department of Plant, Soil and Microbial Sciences, Michigan State University, East Lansing 48824, USA.
authors.forename: Wenjun
authors.initials: W
authors.lastname: Gui
authors.affiliation: Institute of Pesticide and Environmental Toxicology, Zhejiang University, Hangzhou 310058, PR China.
authors.forename: Chunxia
authors.initials: C
authors.lastname: Tian
authors.affiliation: Institute of Pesticide and Environmental Toxicology, Zhejiang University, Hangzhou 310058, PR China.
authors.forename: Qianqian
authors.initials: Q
authors.lastname: Sun
authors.affiliation: Institute of Pesticide and Environmental Toxicology, Zhejiang University, Hangzhou 310058, PR China.
authors.forename: Shuying
authors.initials: S
authors.lastname: Li
authors.affiliation: Department of Plant, Soil and Microbial Sciences, Michigan State University, East Lansing 48824, USA; Environmental Science and Policy Program, Michigan State University, East Lansing 48824, USA.
authors.forename: Wei
authors.initials: W
authors.lastname: Zhang
authors.affiliation: Zhejiang Provincial Center for Disease Prevention and Control, Hangzhou 310009, Zhejiang Province, PR China. Electronic address: tanjun_77@hotmail.com.
authors.forename: Jun
authors.initials: J
authors.lastname: Tang
authors.affiliation: Institute of Pesticide and Environmental Toxicology, Zhejiang University, Hangzhou 310058, PR China. Electronic address: zhugn@zju.edu.cn.
authors.forename: Guonian
authors.initials: G
authors.lastname: Zhu
mesh_terms: D000327:Adsorption; D002851:Chromatography, High Pressure Liquid; D005618:Fresh Water; D019015:Geologic Sediments / Q000737:chemistry; D013058:Mass Spectrometry; D010575:Pesticides
chemical_list: D010575:Pesticides
keywords: Azocyclotin; Fenbutatin oxide; Inductively coupled plasma-mass spectrometry; Sorption; Transformation; Triphenyltin hydroxide