Determinação de contaminantes em óleos lubrificantes usados e em esgotos contaminados por esses lubrificantes

Química Nova

Eva Lúcia Cardoso Silveira¹  Lília Basílio De Caland¹  Carla Verônica Rodarte De Moura¹  Edmilson Miranda Moura¹ 

[1] ,Universidade Federal do Piauí Departamento de Química Teresina PI ,Brasil

关键词: metal determination;    lubricating oil;    atomic absorption spectrometry;   

DOI  :  10.1590/S0100-40422006000600009

来源: SciELO

【 摘 要 】

A simple and reliable ashing procedure is proposed for the preparation of used lubricating oil samples for the determination of Zn, Fe, Pb, Ni and Cu by the flame atomic absorption spectrometry technique. Sulphanilic acid was added to oil samples, the mixture coked and the coke ashed at 550 ºC. The solutions of the ash were analysed by flame AAS for these metals. The quantification limits were 38.250 µg g-1 for Zn, 4.550 µg g-1 for Fe, 1.562 µg g-1 for Pb, 1.450 µg g-1 for Ni, and 0.439 µg g-1 for Cu. The determinations, in lubricating oil, showed good precision and accuracy with recoveries between 90 and 110 %, indicating a negligible matrix effect in the experiments using addition of analyte, with relative standard deviation lower than 5%. The results for analysis of wastewater contamined by theses lubricants showed a very high relative standard deviation.

【 授权许可】

CC BY-NC   
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