[PDF][PDF] Determination of Cd, Pb, Cu and Zn in wood by differential puls anodic stripping voltammetry

J Opydo, W Zembrzuski - Chemia Analityczna, 1993 - beta.chem.uw.edu.pl
J Opydo, W Zembrzuski
Chemia Analityczna, 1993beta.chem.uw.edu.pl
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 1-1 acetic acid in the case of Cd, Pb and Cu and 0.2 mol 1-1 acetate buffer at pH 4.5
in the case of Zn. The accuracy and precision of the described method were satisfactory (the …
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 1-1 acetic acid in the case of Cd, Pb and Cu and 0.2 mol 1-1 acetate buffer at pH 4.5 in the case of Zn. The accuracy and precision of the described method were satisfactory (the relative standard deviation was 11.8% for Cd, 1.4% for Pb, 9.0% for Cu and 15.9% for Zn).
W pracy przedstawiono metode oznaczania kadmu, olowiu, miedzi i cynku w drewnie debow Quercus robur L., metoda woltamperometrii roznicowe] pulsowej, z uzyciem wiszacej rteciowej elektrody kroplowej. Pr6bki drewna mineralizowano mieszanina 30% wody utlenionej z niewielkim dodatkiem stezonego kwasu azotowego. Elektrolitem podstawowym byl 0, 2 mol~-1 roztw6r kwasu octowego w przypadku oznaczania Cd, Pb i Cu oraz 0, 2 mol 1-1 bufor octanowy (pH 4.5) wprzypadku oznaczania Zn. Dokladnosc i precyzja opracowanej metody s<\zadowalajace (wzgledne odchylenie standardowe opracowanej metody wynosi 11.8% dla Cd, 1.4% dla Pb, 9.0% dla Cu i 15.9% dla Zn).'
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