Journal
QUIMICA NOVA
Volume 25, Issue 5, Pages 808-813Publisher
SOC BRASILEIRA QUIMICA
DOI: 10.1590/S0100-40422002000500017
Keywords
copper; speciation; cathodic stripping voltammetry
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Probably one of the most difficult and challenging aspects of measuring trace metals in natural waters is to avoid contamination during sampling, manipulation and analysis. This work discusses how to avoid contamination using simple procedures, and considers alternative methods to purify deionised water and low grade reagents to enable accurate determination of trace metals in natural waters in a common laboratory. Measurements were performed by cathodic stripping voltammetry and copper was used as a model metal to test the procedures. It was possible to evaluate copper speciation in natural waters even when total dissolved copper concentration was as low as 1.5 nmol L-1. The methods' accuracy was confirmed by analysis of certified seawater.
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