Collection and Separation of Metal with Xanthogenic Acid Derivative of Vinyl Polymer for Gel Filtration

Abstract

A new ion exchanger named "xanthogenized TOYOPEARL" (X-TYP) was prepared by the reaction of TOYOPEARL HW-40 (Toyo Soda Manufacturing Co. ) with carbon disulfide in aqueous sodium hydroxide solution. Mercury (II), copper (II ), lead(II), cadmium (II), nickel (II) and zinc(II) were collected completely from 50 ml of 1 x10-5 mol ⋅l-1 solution of each metal salts over the pH range of 0.1-10.0, O.1-10.0, 3.5-5.7, 4.4-5.4, 4.4-7.4 and 5.48.5, respectively, by stirring with 0.1g of X-TYP for 30 min at room temperature. Collection of each metals was incomplete in the presence of EDTA. Each metals except for mercury of 5.00 x 10-4 mmol were collected completely by column method with 0.3 g of X-TYP from 5l of test solution and recovered by elution with conc. nitric acid. The separation of copper and zinc was carried out as follows. Both 5.00 x 10-4 mmol of two metals were collected together by passing 500 ml mixed metal solution at pH 5.4 through a column packed with O.3g of X-TYP. Zinc was eluted with 2 mol⋅l-1 nitric acid and then copper left on X-TYP was eluted with conc. nitric acid. The separation of copper from other metals such as nickel, cadmium and lead was also successful by the similar procedure. Similarly, nickel was separated successfully from lead by elution with nitric acid (pH 3) after collection of two metals.