Original scientific paper

A New Method for Data Analysis in Studies of Trace Metal Complexation

Ivica Ružić ; Ruđer Bošković Institute, Center for Marine Research, P.O.B. 1016, 10001 Zagreb, Croatia
Jadranka Pečar ; Ruđer Bošković Institute, Center for Marine Research, P.O.B. 1016, 10001 Zagreb, Croatia

Abstract

A new method for correction of the asymptote at high additions of trace metal during titration was developed for the van den Berg- Ružić plot. Using this method, a more accurate value for complex- ing capacity can be obtained from titration data. The accuracy of this parameter is a limiting factor for detailed studies of trace metal complexation in natural waters. In addition, a sequential analysis of the shape of titration curves is proposed, by which more than two different groups of complexes can be identified in the case of a large ratio between the complexing capacity and trace metal concentration originally present in the water sample. These procedures are illustrated by the analysis of synthetic titration curves for two and three groups of different complexes. The complexation parameters were reproduced with satisfactory accuracy in both cases. Simultaneous use of both the van den Berg-Ružić and Scatchard plots is suggested in order to test the agreement between the experimental titration data and theoretical predictions based on the complexation parameters determined.

Keywords

Hrčak ID:

135617

URI

https://hrcak.srce.hr/135617

Publication date:

3.4.1997.

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