Voltammetric Determination of Arsenic in Zinc Oxide Used as a Feed Additive

Abstract

Cathodic stripping voltammetry at a hanging mercury drop electrode was applied for determination of arsenic in samples of zinc oxide intended for use as a feed additive. The determinations were carried out in acidic medium in the presence of Cu(II). The As(V) was prereduced to As(III) by potassium iodide and ascorbic acid at ambient temperature. The detection limit was 0.1 ng mL−1. The feasibility of simultaneous determination of arsenic and cadmium in such analysis was also shown. The electrothermal atomic absorption spectrometry was used as a reference method.

Electroanalytical methods for determination of the metal content and acetic-acid-available metal fractions in soils

“…DP ASV was used for determination of cadmium and lead. For arsenic the use of DP CSV requires removal of HNO 3 before determination [4,5]. Because of reports of losses of arsenic during heating of samples at 150°C after addition of 0.2 mL H 2 SO 4 in the presence of HF [12], for soils C, D, and reference material an investigation was conducted to determine whether digestion with HNO 3 and HClO 4 is possible without addition of HF.…”

“…A Princeton Applied Research 264 A polarographic analyzer equipped with an X-Y recorder (RE 0150 PAR), Polarecord E-504 (Metrohm), and the electrode system HMDE as working electrode, saturated Ag/AgCl as reference electrode, and Pt-wire as an auxiliary electrode, was used for voltammetry Cathodic stripping voltammetry for determination of arsenic was performed according to a procedure described elsewhere [4,5]. Sample solution (approx.…”

“…In the work discussed in this paper the usefulness of anodic stripping voltammetry (ASV) for determination of Cd and Pb [3] and of cathodic stripping voltammetry (CSV) for determination of As [4,5], in extracts obtained by solid-liquid extraction of soil samples according to the procedure proposed by the Standard Measurement and Testing Programme (BCR) [6,7,8], and in solution after microwave digestion of the soil samples, has been evaluated. For comparison atomic absorption spectrometry with a graphite furnace was also used.…”

Determination of trace arsenic with DDTC-Na by cathodic stripping voltammetry in presence of copper ions

“…Arsenic determination in those conditions depends on the number of factors such as: the copper concentration, time and the deposition potential, the concentration of supporting electrolyte and its pH. This system was studied by Kowalska and Golimowski [9,10]. Recently Piech et al [21] showed that this method has unique dependence on hydrodynamic conditions during deposition step.…”