Analysis of rain water by differential-pulse stripping voltammetry in nitric acid medium

✍ Scribed by Z. Komy; E. Roekens; R. van Grieken

• Publisher: Elsevier Science
• Year: 1988
• Tongue: English
• Weight: 512 KB
• Volume: 204
• Category: Article
• ISSN: 0003-2670
• DOI: 10.1016/s0003-2670(00)86357-6

✦ Synopsis

Differential-pulse anodic stripping voltammetry is applied to determine cadmium, lead and copper m rain water acidified with nitric acid to pH 1.5, and zinc after partial neutralization to pH 4.5. Subsequently, cobalt and nickel are measured in the adsorptive mode after formation of their dimethylglyoximates. The effects of pH on the stripping peaks for Zn, Cd, Pb and Cu and of chloride on the stripping peak of copper are reported. Good agreement is found with d.p.s.v. determinations m hydrochloric acid medium and with a.a.s. measurements in most cases. Excellent accuracy is demonstrated; the average relative standard deviation per measurement appears to be between 12 and 22% for the overall analytical procedure for concentrations of 0.15-50 ,ug 1-i of the various metals in the samples.