Impact of the Analytical Blank in the Uncertainty Evaluation of the Copper Content in Waters by Flame Atomic Absorption Spectrometry

Author:

de Oliveira Elcio Cruz1,Monteiro Maria Inês Couto2,Pontes Fernanda Veronesi Marinho2,Almeida Marcelo Dominguez de2,Carneiro Manuel Castro2,da Silva Lílian Irene Dias2,Neto Arnaldo Alcover2

Affiliation:

1. PETROBRAS TRANSPORTE S.A, Gerência Geral de Engenharia, Av. Pres. Vargas, 328, 20091-060 Rio de Janeiro, RJ, Brazil

2. Centro de Tecnologia Mineral (CETEM); Coordenação de Análises Minerais (COAM); Setor de Caracterização Química (SCQ) Av. Pedro Calmon, 900 Ilha da Cidade Universitária, Rio de Janeiro, RJ, Brazil

Abstract

Abstract Chemical analysts use analytical blanks in their analyses, but seldom is this source of uncertainty evaluated. Generally, there is great confusion. Although the numerical value of the blank, in some situations, can be negligible, its source of uncertainty cannot be. This article discusses the uncertainty contribution of the analytical blank using a numerical example of the copper content in waters by flame atomic absorption spectrometry. The results indicate that the uncertainties of the analytical blank can contribute up to 50% when the blank sample is considered in this analysis, confirming its high impact. This effect can be primarily observed where the analyte concentration approaches the lower range of the analytical curve. Even so, the blank is not always computed. Therefore, the relevance of the analytical blank can be confirmed by uncertainty evaluation.

Publisher

Oxford University Press (OUP)

Subject

Pharmacology,Agronomy and Crop Science,Environmental Chemistry,Food Science,Analytical Chemistry

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