ascorbic-acid and dibenzo-18-crown-6

A column chromatographic separation method has been developed for separation of Lead(II) using poly[dibenzo-18-crown-6]. The separation was carried out in L-ascorbic acid medium. The adsorption of Lead(II) was quantitative from 1 x 10(-2) M to 1 x 10(-7) M L-ascorbic acid. The capacity of poly [dibenzo-18-crown-6] for Lead (II) was found to be 0.530 +/- 0.01 mmol/g of crown polymer. Lead(II) was separated from commonly associated metal ions such as Mg(II), Co(II), Ni(II), Cd(II), Mn(II) Th(IV) and U(VI) and other associated metal ions in binary as well as in multicomponent mixtures. The sorption of Lead was carried out in presence of various ions to ascertain the tolerance limits of individual. The method was extended for the determination of Lead in real samples. The method is simple, rapid and selective having good reproducibility (approximately +/- 2%).

Topics: Adsorption; Ascorbic Acid; Chromatography; Crown Ethers; Lead; Reproducibility of Results; Spectrophotometry; Waste Disposal, Fluid; Water Pollutants, Chemical; Water Purification