title: Derivative spectrophotometric method for copper determination.
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 (3σ) 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.
authors.affiliation: Department of Chemistry, Faculty of Sciences, University of Chile, Las Palmeras no. 3425, P.O. Box 653, Santiago, Chile.
authors.forename: M
authors.initials: M
authors.lastname: Inés Toral
authors.forename: P
authors.initials: P
authors.lastname: Richter
authors.forename: B
authors.initials: B
authors.lastname: Muñoz