Avaliação de diferentes métodos para a determinação de cobre em óleo mineral isolante por espectrometria de absorção atômica com forno de grafite

Química Nova

Luiz Fernando S. Caldas¹  Carlos Eduardo R. De Paula¹  Daniel M. Brum¹  Fábio G. Lepri¹  Ricardo J. Cassella¹ 

[1] ,Universidade Federal Fluminense Departamento de Química Analítica Niterói RJ ,Brasil

关键词: insulating oil;    copper;    GFAAS;   

DOI  :  10.5935/0100-4042.20140125

来源: SciELO

【 摘 要 】

This aim of this work was to compare two methods for copper determination in insulating oils from power transformers by GFAAS. The first method was extraction induced by emulsion breaking, which determined the preconcentration of copper in an aqueous solution and exhibited a limit of quantification of 0.27 µg L-1. Also, a second method based on the direct introduction of samples into GFAAS in the form of detergent emulsions, prepared with Triton X-114 and HNO3, was investigated. In this case, the limit of quantification was 1.7 µg L-1. Seven samples of used oils were successfully analyzed by both methods.

【 授权许可】

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