EXTRACTION OF LEAD(II) WITH CYANEX-302 AND ITS SPECTROPHOTOMETRIC DETERMINATION WITH PAR

A method is developed for the extraction of lead(II) from an aqueous s olution of pH 2.1-8.3 with cyanex 302 [bis(2,4,4-trimethylpentyl monot hiophosphinic acid)] in toluene as an extractant. Lead(II) was strippe d with 0.1 mol dm(-3) nitric acid and determined spectrophotometricall y with PAR. The method is most sensitive and permits the separation of lead(II) from binary mixtures containing commonly associated metal io ns. The method is applicable for the separation and determination of l ead in alloys and environmental samples. (C) 1998 Elsevier Science B.V .