Evaluation of different methods for copper determination in insulating oils by graphite furnace atomic absorption spectrometry

Quimica nova

de Paula, Carlos Eduardo R.¹  Caldas, Luiz Fernando S.²  Cassella, Ricardo J.²  Brum, Daniel M.²  Lepri, Fábio G.³ 

[1] Instituto Federal de Educação, Ciência e Tecnologia do Rio de Janeiro, Nilópolis, Brasil;Universidade Federal Fluminense, Niterói, Brasil;Universidade Federal Rural do Rio de Janeiro, Seropédica, Brasil

关键词: insulating oil;    copper;    GFAAS.;   

DOI  :  10.5935/0100-4042.20140125

学科分类：化学（综合）

来源: Sociedade Brasileira de Quimica

【 摘 要 】

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

【 授权许可】

CC BY