Application of second harmonic alternating current anodic stripping voltammetry in the simultaneous trace and ultra trace metal determination of a multicomponent system

✍ Scribed by Francesco Fagioli; Clinio Locatelli; Silvio Landi; Roberto Vecchietti

• Publisher: John Wiley and Sons
• Year: 1989
• Tongue: English
• Weight: 465 KB
• Volume: 1
• Category: Article
• ISSN: 1040-0397
• DOI: 10.1002/elan.1140010512

✦ Synopsis

Second harmonic alternating current voltammetry coupled with anodic stripping techniques has been used for the simultaneous determination of lead(II), tin(II), and thallium( I) (elements which, in common supporting electrolytes exhibit similar half-wave potentials). The supporting electrolyte was 0.1 M HC104 for the Pb-TI couple with the subsequent addition of EDTA (0.02 M) for measuring the tin ion. Once conditions for the experimental measurements were optimized, calculation was done for the various concentration ratios for which one could determine one element in the presence of the other two; the maimum experimental error was 5%. These concentration ( c ) ratios were a s follows: cs,, : 0.02 M). Precision and accuracy data (3-5%) are also reported and expressed, respeczively, as the relative standard deviation and relative error. The detection h i t for each element proved t o be around lo-' M. Tlie standard addition technique improved the resolution o f the alteranting current voltammetric method, even in the case of very high concentration ratios.