Abstract
Lead and cadmium in 0.1Mpotassium chloride -0.01M hydrochloric acid (20ml) are electrodeposited on a mercury-plated platinum electrode (0.7 mm diam.×2.2 mm) at -1.0Vvs. S.C.E. for 30 min. After 30 to 60 sec, an anodic dissolution curve is recorded by a radio-frequency polarograph (455 kc/s, 100% amplitude modulation with 200 c/s square wave, 4 V) at the scan rate of 0.2 V/min. The peak height-concentration curves are linear over the range of 0.01 to 0.1μg of lead and 0.1 to 1μg of cadmium. The method is applied to the determination of lead and cadmium in vanadium in combination with the anion-exchange separation.
