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Pure Appl. Chem. Vol. 73, No. 1, pp. 45-54 (2001)

Pure and Applied Chemistry

Vol. 73, Issue 1

Detecting and circumventing sources of inaccuracy in flow analysis*

Elias A. G. Zagatto, Fábio R. P. Rocha, Patrícia B. Martelli, and Boaventura F. Reis

Centro de Energia Nuclear na Agricultura, Universidade de São Paulo, Box 96, Piracicaba SP 13400-970, Brazil

Abstract: Mechanized procedures for chemical analyses are susceptible to systematic errors usually difficult to trace. This holds also for flow analysis that although accepted worldwide may sometimes yield inaccurate results. The present work focused on the development of a simple system able to detect and circumvent sources of inaccuracy. The versatility inherent in the multicommuted flow analyzers was exploited for real-time characterization of the source of inaccuracy and overcoming the problem for every assayed sample. Specific situations where the analytical results are more susceptible to inaccuracy are emphasized.

* Lectures presented at the 11th European Conference on Analytical Chemistry (EUROANALYSIS XI), Lisbon, Portugal, 3 —9 September 2000. Other presentations are published in this issue, pp. 1-54.

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