A liquid–liquid extraction technique for phthalate esters with water-soluble organic solvents by adding inorganic salts |
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Authors: | Yaqi Cai Yu’e Cai Yali Shi Jiemin Liu Shifen Mou Yiqiang Lu |
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Institution: | (1) Key Laboratory of Environmental Chemistry and Ecotoxicology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, 100085 Beijing, China;(2) Department of Chemistry, University of Science and Technology Beijing, 100083 Beijing, China |
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Abstract: | In the presence of inorganic salts, the mixture solution of some water-soluble organic solvents and water can form two clearly
separated phases. One is the organic solvent rich phase, the other is the water rich phase. In the phase separation process,
hydrophobic solutes dissolved in the mixture solution such as phthalate esters can be extracted into the organic solvent rich
phase quantitatively. Based on this phase separation phenomenon, a liquid–liquid extraction technique of phthalate esters
using water-soluble organic solvents as organic phases was developed. Several important parameters affecting the extraction
efficiency including the kind and the amount of water-soluble organic solvents, the kind and the amount of inorganic salts
and the pH of the sample solutions were carefully studied. This new extraction technique has been applied to the HPLC analysis
for water lixivium of plastic wrapping film. Under the optimized conditions, detection limits of 1.5, 2.3, 1.0, 2.6, 1.3 and
3.0 ng mL−1 were obtained for diethylphthalate, di-n-propylphthalate, di-iso-butylphthalate, dicyclohexylphthalate, di-n-octylphthalate and di-n-nonylphthalate ester respectively. The strongpoints of this new liquid–liquid extraction technique are the easy phase separation,
rapid partition equilibrium, less toxicity and very good compatibility with subsequent HPLC determinations. |
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Keywords: | : Liquid– liquid extraction phthalate esters water-soluble organic solvents HPLC |
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