Amperometric determination of cyanides at the low ppb level by automated preconcentration based on gas diffusion coupled to sequential injection analysis
2009 (English)In: Talanta: The International Journal of Pure and Applied Analytical Chemistry, ISSN 0039-9140, E-ISSN 1873-3573, Vol. 77, 1620-1626 p.Article in journal (Refereed) Published
A simple, sensitive method for determining free cyanides is described. The assay is based on automated gas diffusion of the analyte using sequential injection analysis (SIA) coupled to amperometric detection on a silverworking electrode. The effects of varying several parameters affecting the analytical procedure (including the flow rates of the donor and acceptor streams, the concentrations of the reagents and the sample volumes)were studied. The validity and quality of themethodwere also assessed, by examining its linearity, limits of detection and quantitation, precision, selectivity to potentially interfering substances. Its sensitivity can be enhanced by applying a simple preconcentration step, following which limits of detection were found to be 0.05–0.12gL−1.
Application of the proposed assay to the analysis of tap, mineral and tablewater samples spiked at concentrations ranging from1 to 10gL−1 CN−, yielded satisfactory recoveries (88–112%).
Place, publisher, year, edition, pages
2009. Vol. 77, 1620-1626 p.
IdentifiersURN: urn:nbn:se:su:diva-35126DOI: 10.1016/j.talanta.2008.09.058ISI: 000263388600011OAI: oai:DiVA.org:su-35126DiVA: diva2:286461