Cloud point extraction coupled with HPLC-UV for the determination of
phthalate esters in environmental water samples |
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Authors: | WANG Ling JIANG Gui-bin CAI Ya-qi HE Bin WANG Ya-wei and SHEN Da-zhong |
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Institution: | 1. School of Chemistry and Chemical Engineering, Shan Dong University, Jinan 250100, China;State Key Laboratory of Environmental Chemistry and Ecotoxicology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China 2. State Key Laboratory of Environmental Chemistry and Ecotoxicology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China 3. School of Chemistry and Chemical Engineering, Shan Dong University, Jinan 250100, China |
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Abstract: | 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 by high-performance liquid chromatography separation and ultraviolet detection (HPLC-UV). The non-ionic surfactant Triton X-114 was chosen as extraction solvent. The parameters affecting extraction efficiency, 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 effluent water of the wastewater treatment plant and the lixivium of plastic fragments. |
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Keywords: | phthalate esters cloud point extraction Triton X-114 non-ionic surfactant HPLC-UV wastewater treatment environmental phthalate esters determination coupled extraction point trace effluent plant lixivium plastic fragments sample detection preconcentration factors optimum conditions centrifugation time |
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