Derivative spectrophotometric method for copper determination |
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Authors: | M. Inés Toral Pablo Richter Braulio Muñoz |
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Affiliation: | (1) Department of Chemistry, Faculty of Sciences, University of Chile, Las Palmeras no. 3425, P.O. Box 653, Santiago, Chile |
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Abstract: | A simple, sensitive and selective method by solvent extraction-first derivative spectrophotometry is described for the determination of microamounts of copper in water by means of its reaction and extraction at pH 8.0 with 3-(4-phenyl-2-pyridinyl-5-phenyl-1,2,4-triazine) (PPT) and picrate (2,4,6-trinitro-phenol) into 1,2-dichloroethane. Copper was thus determined in the range 7.5–350 ng/ml with a detection limits (3 ) of 2.3 ng/ml. The relative standard deviations were in all instances less than 2.0%. The proposed method was successfully applied for the determination of copper in several kinds of water. |
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