Reis B F, Knochen M, Pignalosa G, Cabrera N, Giglio J
Universidade de São Paulo, CENA, Av. Centenário 303, CEP 13400-961 Piracicaba, São Paulo, Brazil.
Talanta. 2004 Dec 15;64(5):1220-5. doi: 10.1016/j.talanta.2004.03.070.
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 0-40ppm (w/w) (Cu, Fe) and 0-15ppm (w/w) (Cr, Pb) were also achieved.
在本工作中，描述了一种使用火焰原子吸收光谱法作为检测技术测定润滑油中铜、铬、铁和铅的流动分析程序。流动歧管设计用于实施多换向方法，它由三台由个人计算机控制的三通电磁阀组成。所展示的流动系统能够在无需任何预处理的情况下处理油样以测定磨损金属。为评估准确性，将结果与使用火焰原子吸收光谱法的手动程序所获得的结果进行了比较。应用联合置信椭圆检验，在95%置信水平下未观察到显著差异。还实现了其他有益特性，如每小时50次测定的样品通量；铜的相对标准偏差（n = 5）低于2%，铬、铁和铅的相对标准偏差低于8%；以及在0 - 40ppm（w/w）（铜、铁）和0 - 15ppm（w/w）（铬、铅）范围内的线性响应。
