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A very simple, ultra-sensitive, highly selective and non-extractive spectrophotometric method for the determination of trace amounts copper(II) has been developed. Salicylaldehydebenzoylhydrazone(SAL-BH)has been proposed as a new analytical reagent for the direct non-extractive spectrophotometric determination of copper(II). SAL-BH reacts with copper in a slightly acidic(0.0001-0.005M H2SO4) in 40% 1,4-dioxane media with copper(II) to give a highly absorbent greenish yellow chelate with a molar ratio 1:1(CuII:SAL-BH) The reaction is instantaneous and the maximum absorption was obtained at 404 nm and remainsstable for 72 h. The average molar absorptivity and Sandell’s sensitivity were found to be 1.4×105 L mol-1cm-1and 5.0 ng cm-2 of copper(II), respectively. Linear calibration graphs were obtained for 0.01 –18 mg L-1of CuII. The detection limit and quantification limit of the reaction system were found to be 1 ng mL-1and 10 μg L-1, respectively. A large excess of over 50 cations, anions and complexing agents (e.g., tartrate, oxalate, citrate, phosphate, thiocyanate etc.) do not interfere in the determination. The method is highly selective for copperand was successfully used for the determination of copper in several standard reference materials (steels and alloys) as well as in some environmental waters (portable and polluted), biological (human bloodand urine), food and soil samples and solutions containing both copper(I) and copper(II) as well as some complex synthetic mixtures. The results of the proposed method for biological and food samples were comparable with AAS and were found to be in goodagreement. The method has high precision and accuracy (s = ± 0.01 for 0.5 mg L-1)
M. Jamaluddin Ahmed, Tasnima Zannat. (2012) A Simple Spectrophotometric Method for the Determination of Copper in Some Real, Environmental, Biological, Food and Soil Samples Using SalicylaldehydeBenzoylHydrazone, Pakistan Journal of Analytical & Environmental Chemistry, Volume 13, Issue 1.
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