TITLE

Determination of organophosphorus pesticides in environmental water samples by dispersive liquid–liquid microextraction with solidification of floating organic droplet followed by high-performance liquid chromatography

AUTHOR(S)
Chunxia Wu; Huimin Liu; Weihua Liu; Qiuhua Wu; Chun Wang; Zhi Wang
PUB. DATE
July 2010
SOURCE
Analytical & Bioanalytical Chemistry;Jul2010, Vol. 397 Issue 6, p2543
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
A simple dispersive liquid–liquid microextraction based on solidification of floating organic droplet coupled with high-performance liquid chromatography–diode array detection was developed for the determination of five organophosphorus pesticides (OPs) in water samples. In this method, the extraction solvent used is of low density, low toxicity, and proper melting point near room temperature. The extractant droplet could be collected easily by solidifying it in the lower temperature. Some important experimental parameters that affect the extraction efficiencies were optimized. Under the optimum conditions, the calibration curve was linear in the concentration range from 1 to 200 ng mL−1 for the five OPs (triazophos, parathion, diazinon, phoxim, and parathion-methyl), with the correlation coefficients ( r) varying from 0.9991 to 0.9998. High enrichment factors were achieved ranging from 215 to 557. The limits of detection were in the range between 0.1 and 0.3 ng mL−1. The recoveries of the target analytes from water samples at spiking levels of 5.0 and 50.0 ng mL−1 were 82.2–98.8% and 83.6–104.0%, respectively. The relative standard deviations fell in the range of 4.4% to 6.3%. The method was suitable for the determination of the OPs in real water samples.
ACCESSION #
51880436

 

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