Environmental analytical methods

Cloud point extraction coupled with HPLC-UV for the determination ofphthalate esters in environmental water samples

WANG Ling , JIANG Gui-bin , CAI Ya-qi , HE Bin , WANG Ya-wei , SHEN Da-zhong


Received August 11, 2006,Revised January 08, 2007, Accepted , Available online

Volume 19,2007,Pages 874-878

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A method based on cloud point extraction was developed to determine phthalate esters including di-ethyl-phthalate (DEP), di- (2-ethylhexyl)-phthalate (DEHP) and di-cyclohexyl-phthalate (DCP) in environmental water samples using high-performance liquid chromatography separation and ultraviolet detection (HPLC-UV). The non-ionic surfactant Triton X-114 was chosen as extraction solvent. The parameters a ecting extraction e ciency, such as concentrations of Triton X-114 and Na2SO4, equilibration temperature, equilibration time and centrifugation time were evaluated and optimized. Under the optimum conditions, the method can achieve preconcentration factors of 35, 88, 111 and detection of limits of 2.0, 3.8, 1.0 ng/ml for DEP, DEHP and DCP in 10-ml water sample, respectively. The proposed method was successfully applied to the determination of trace amount of phathalate esters in e uent water of the wastewater treatment plant and the lixivium of plastic fragments.

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