Determination of the Cd, Pb, Cu, Zn in wood by differential pulse anodic stripping voltammetry

This paper presents a new method for the determination of cadmium, lead, copper and zinc in the wood of oaks ''Quercus robur L.'', using differential pulse anodic stripping voltammetry at the hanging mercury drop electrode. Wood samples were mineralized by a mixture of 30% hydrogen peroxide with a small addition of concentrated nitric acid. The base electrolyte was 0.2 mol l-1 acetic acid in the case of Cd, Pb and Cu and 0.2 mol l-1 acetate buffer at pH 4.5 in the case of Zn. The accuracy and precision of the described method were satisfactory (the standard deviation was 11.8% for Cd, 1.4% for Pb, 9.0% for Cu and 15.9% for Zn). (author). 11 refs, 3 tabs