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Liquid Phase Microextraction of Di-(2- ethylhexyl) phthalate from Polymer Films with Deep Eutectic Solvent Composed of Choline hloride and Urea and Potentiometric determination

X. Zhu, J. Gao, J. Lang, H. Zhang, Y. Zhu

Di-(2-ethylhexyl) phthalate (DEHP) is an endocrine chemical, and has been widely used as a plastizer in polymer materials. In the present paper, DEHP was directly extracted from polymer films with micro liquid phase on a carbon paste electrode composed of graphite powder and deep eutectic solvent, and monitored by open circuit potential method. The micro extraction process follows an exponential association function with the apparent first order rate constant of 6.35×10-4 s-1. The potential responds to the amount of DEHP in the polymer films was described as the Nernstian equation with 31.0 mV/decade of slope, and used in the detection of DEHP. Five polymer film samples were tested by this method, the reasonable results were obtained