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Application of liquid membranes to sample preconcentration for the spectrometric determination of cadmium in seawater

✍ Scribed by Leyre Irigoyen; Carlos Moreno; Carolina Mendiguchía; Manuel García-Vargas

Publisher
Elsevier Science
Year
2006
Tongue
English
Weight
102 KB
Volume
274
Category
Article
ISSN
0376-7388

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✦ Synopsis

A bulk liquid membrane system has been used as preconcentration tool for the spectrometric determination of cadmium in seawater. The membrane contained di-(2-ethylhexyl)-phosphoric acid (DEHPA) as mobile carrier dissolved in kerosene. The effects of the composition of both organic and aqueous solutions on the permeation of Cd across the membrane were studied, and optimum conditions were found by the modified simplex method. Maximum preconcentration rates were obtained at a sample pH of 4.7, maintained with a 0.1 mol l -1 acetate buffer solution, a 0.3 mol l -1 HNO 3 receiving solution, and a carrier concentration of 0.17 mol l -1 . Under optimum conditions, a preconcentration yield of 100% was obtained for both synthetic and real seawater. The method was successfully applied to the determination of cadmium in real seawater.

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