Simultaneous determination of organotin pesticides by HPLC-ICP-MS and their sorption, desorption, and transformation in freshwater sediments. (15th May 2016)

• Record Type: Journal Article
• Authors: Gui, Wenjun; Tian, Chunxia; Sun, Qianqian; Li, Shuying; Zhang, Wei; Tang, Jun; Zhu, Guonian
• Is Part Of: Water research. Volume 95(2016)
• Page Start: 185
• Page End: 194
• Publication Date: 2016-05-15
• Subjects: Triphenyltin hydroxide -- Azocyclotin -- Fenbutatin oxide -- Inductively coupled plasma-mass spectrometry -- Sorption -- Transformation; OTCs organotin compounds -- OTPs organotin pesticides -- TPTOH triphenyltin hydroxide -- ACT azocyclotin -- FBTO fenbutatin oxide -- DCM dichloromethane -- TEA triethylamine -- TEAA triethylamine-acetic acid -- PTFE polytetrafluoroethylene -- HPLC-ICP-MS high performance liquid chromatography-inductively coupled plasma-mass spectrometry -- LLE liquid–liquid extraction -- MLODs method limits of detection -- MLOQs method limits of quantification -- SLOQ sample limit of quantification; Water -- Pollution -- Research -- Periodicals; 363.7394
• DOI: 10.1016/j.watres.2016.02.056
• Languages: English
• ISSNs: 0043-1354

Abstract

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 ( K d ) 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. Graphical abstract: Highlights: Simultaneous analysis of three OTPs in environmental samples by HPLC-ICP-MS. Sorption isotherms of three OTPs on sediments were followed the Henry model. Sorption kinetic of the OTPs on sediment obeyed the pseudo 2nd-order kinetic model. External mass transfer of particles was the rate-controlling of the adsorption. OTPs could moderately degrade in anaerobic or aerobic water-sediment system.