A multicommuted flow system for the determination of copper, chromium, iron and lead in lubricating oils with detection by flame AAS |
| |
Authors: | Reis B F Knochen M Pignalosa G Cabrera N Giglio J |
| |
Affiliation: | a Universidade de São Paulo, CENA, Av. Centenário 303, CEP 13400-961 Piracicaba, São Paulo, Brazil b Departamento “Estrella Campos”, Facultad de Química, Universidad de la República, Av. Gral. Flores 2124, Casilla 1157, 11800, Montevideo, Uruguay |
| |
Abstract: | In this work, a flow analysis procedure for the determination of copper, chromium, iron and lead in lubricating oils using flame AAS as detection technique is described. The flow manifold was designed to implement the multicommutation approach and it comprised three 3-way solenoid valves controlled by a personal computer. The flow system presented allowed to process the oil samples to determine wear metals without any prior preparation. Aiming to assess accuracy the results were compared with those obtained by manual procedure using flame AAS. Applying the joint-confidence ellipse test, no significant difference at the 95% confidence level was observed. Other profitable features such as a sample throughput of 50 determinations per hour; relative standard deviations (n = 5) below 2% for Cu, and below 8% for Cr, Fe and Pb; and linear responses in the range 0–40 ppm (w/w) (Cu, Fe) and 0–15 ppm (w/w) (Cr, Pb) were also achieved. |
| |
Keywords: | Flow analysis Multicommutation Lubricating oil Flame atomic absorption spectrometry Copper, chromium, iron and lead |
本文献已被 ScienceDirect PubMed 等数据库收录! |
|