Determination of contaminants in used lubricating oils and in wastewater contamined by these lubricants

Quimica nova

Moura, Edmilson Miranda¹  Silveira, Eva Lúcia Cardoso¹  Moura, Carla Verônica Rodarte de¹  Caland, Lília Basílio de¹ 

[1] Universidade Federal do Piauí, Teresina, Brasil

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

DOI  :  10.1590/S0100-40422006000600009

学科分类：化学（综合）

来源: Sociedade Brasileira de Quimica

【 摘 要 】

A simple and reliable ashing procedure is proposed for the preparation of usedlubricating oil samples for the determination of Zn, Fe, Pb, Ni and Cu by theflame atomic absorption spectrometry technique. Sulphanilic acid was added tooil samples, the mixture coked and the coke ashed at 550 ºC. Thesolutions of the ash were analysed by flame AAS for these metals. The quantificationlimits were 38.250 µg g-1 for Zn, 4.550 µg g-1for Fe, 1.562 µg g-1 for Pb, 1.450 µg g-1 forNi, and 0.439 µg g-1 for Cu. The determinations, in lubricatingoil, 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 ofwastewater contamined by theses lubricants showed a very high relative standarddeviation.

【 授权许可】

CC BY