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The Chemical Educator

ISSN: 1430-4171 (electronic version)

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Abstract Volume 5 Issue 1 (2000) pp 27-30

Spectrophotometric Methods for the Simultaneous Determination of Metals in University Laboratories

Julia Pérez-Iglesias,* Hervilia M. Seco-Lago, Jesús M. Castro-Romero, José M. Fernández-Solís, and Victoria González-Rodríguez

Department of Analytical Chemistry, University School Polytechnic of Ferrol, University of A Coruña, Ctra. Aneiros s/n, Serantes, 15405- Ferrol. Spain

Published online: 1 February 2000

Abstract. Spectrophotometry is an analytical technique that is studied at the university level because of its ease of operation and low expense. Three different experimental methods of gradual difficulty are proposed for the application of this technique to the simultaneous determination of two metals. The techniques are applicable to the practice of all subdisciplines of experimental chemistry. These techniques are (1) absorption spectrophotometry, the determination of cobalt (II) and copper (II); (2) first-derivative spectrophotometry, the determination of chromium (III) and copper (II); and (3) first-derivative spectrophotometry using the zero-crossing method, the determination of copper (II) and mercury (II).

Key Words:  Laboratories and Demonstrations; quantitative analysis; Beer-Lambert law; absorption spectrophotometry; absorption spectroscopy; experiment

(*) Corresponding author. (E-mail:

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Issue date: February 1, 2000

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