Centrifuge-less dispersive liquid-liquid microextraction base on the solidification of switchable solvent for rapid on-site extraction of four pyrethroid insecticides in water samples

doi:10.1016/j.chroma.2016.10.013

	Centrifuge-less dispersive liquid-liquid microextraction base on the solidification of switchable solvent for rapid on-site extraction of four pyrethroid insecticides in water samples
	Hu, Lu 1; Wang, Huazi 1; Qian, Heng 1; Liu, Chaoran 1; Lu, Runhua 1; Zhang, Sanbing 1; Zhou, Wenfeng 1; Gao, Haixiang 1; Xu, Donghui 2
刊名	JOURNAL OF CHROMATOGRAPHY A
	2016
卷号	1472 页码:1-9
关键词	Switchable solvent Dispersive liquid-liquid microextraction Solidification Filtration Pyrethroid insecticides High-performance liquid chromatography
ISSN号	0021-9673
DOI	10.1016/j.chroma.2016.10.013
通讯作者	Hu, Lu
英文摘要	An on-site dispersive liquid liquid microextraction base on the solidification of switchable solvent has been developed as a simple, rapid and eco-friendly sample extraction method for the fast determination of pyrethroid insecticides in aqueous samples using high-performance liquid chromatography with ultraviolet detection. In this extraction method, medium-chain saturated fatty acids (n >= 10), which can rapidly solidify at low temperatures (<20 degrees C), were investigated as switchable hydrophilic solvents. The fatty acids were converted into the hydrophilic form by adding sodium hydroxide. Microdroplets of the fatty acids were generated when injected into an acidic sample that had been pretreated by the addition of sulfuric acid. The formed cloudy solution was cooled to a low temperature to turn the fatty acids into a solid, which was then separated by filtration, thus avoiding the time-consuming step of centrifugation. The microextraction process was performed in a 10 mL syringe and the pretreatment process could thus be finished in 5 min. No external energy resources were required in this method, which makes it a potential method for on-site extraction. The optimal experimental parameters were as follows: 350 of decanoic acid (1 mol/L) was used as the extraction solvent, 150 mu L of sulfuric acid (2 mol/L) was used to decrease the pH of the samples, no salt was added, and the temperature of the samples was in the range of 20-40 degrees C. Finally, the sample was cooled in an ice bath for three minutes. Under these optimal conditions, good responses for four pyrethroid insecticides were obtained in the concentration ranges of 1-500 mu g/L, with coefficients of determination greater than 0.9993. The recoveries of the four pyrethroid insecticides ranged from 84.7 to 95.3%, with relative standard deviations ranging from 1.6 to 4.6%. The limits of detection based on a signal-to-noise ratio of 3 were in the range of 0.24-0.68 mu g/L, and the enrichment factors were in the range of 121-136. The results demonstrate that this method was successfully applied to determine pyrethroid insecticides in real water samples. No centrifugation or any special apparatus are required, make this a promising method for rapid field-sampling procedures. (C) 2016 Elsevier B.V. All rights reserved.
学科主题	Chemistry, Analytical
语种	英语
出版者	ELSEVIER SCIENCE BV
WOS记录号	WOS:000388153700001
内容类型	期刊论文
源URL	[http://111.203.20.206/handle/2HMLN22E/105890]
专题	蔬菜花卉研究所_质量安全与检测技术研究室
作者单位	1.China Agr Univ, Dept Appl Chem, Yuanmingyuan West Rd 2, Beijing 100194, Peoples R China 2.Chinese Acad Agr Sci, Inst Vegetables & Flowers, Lab Qual & Safety Risk Assessment Vegetable Prod, Minist Agr, 12 Zhongguancun South St, Beijing 100081, Peoples R China
推荐引用方式 GB/T 7714	Hu, Lu,Wang, Huazi,Qian, Heng,et al. Centrifuge-less dispersive liquid-liquid microextraction base on the solidification of switchable solvent for rapid on-site extraction of four pyrethroid insecticides in water samples[J]. JOURNAL OF CHROMATOGRAPHY A,2016,1472:1-9.
APA	Hu, Lu.,Wang, Huazi.,Qian, Heng.,Liu, Chaoran.,Lu, Runhua.,...&Xu, Donghui.(2016).Centrifuge-less dispersive liquid-liquid microextraction base on the solidification of switchable solvent for rapid on-site extraction of four pyrethroid insecticides in water samples.JOURNAL OF CHROMATOGRAPHY A,1472,1-9.
MLA	Hu, Lu,et al."Centrifuge-less dispersive liquid-liquid microextraction base on the solidification of switchable solvent for rapid on-site extraction of four pyrethroid insecticides in water samples".JOURNAL OF CHROMATOGRAPHY A 1472(2016):1-9.