Journal
JOURNAL OF AOAC INTERNATIONAL
Volume 94, Issue 5, Pages 1617-1624Publisher
OXFORD UNIV PRESS INC
DOI: 10.5740/jaoacint.10-388
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A new preconcentration method was developed for the determination of trace amounts of Cu(II), Fe(III), Pb(II), Ni(II), and Cd(II) on a double-walled carbon nanotube disk. 4-(2-Thiazolylazo) resorcinol was used as a complexing reagent. The effects of parameters, including pH of the solutions, amounts of complexing reagent, eluent type, sample volume, flow rates of solutions, and matrix ions were examined for quantitative recoveries of the studied analyte ions. The retained metal ions were eluted by 2 M HNO3. The LOD values for the analytes were in the range of 0.7-4.4 mu g/mL. Natural water samples and standard reference materials were analyzed by the presented method.
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