自动回流萃取-MPT全谱仪测定航空润滑油中磨损金属的含量

Determination of Wear Metals in Aviation Lubricating Oil by Using a Simultaneous MPT Spectrometer with an Automatic Reflux Extraction System

将萃取与回流相结合，建立了一种处理航空润滑油中磨损金属的新方法，并用MPT全谱仪对磨损金属含量进行了同时检测．该方法基本上实现了样品处理的全自动化，克服了常用方法的部分缺点，对Zn，Cd，Cu，Fe和Ph的检出限（3σ）分别为0．084，0．043，0、022，0.052和0．064μg／g；相对标准偏差均小于5％（n=5）；回收率为94．5％～107．4％、对3个润滑油样品的检测结果令人满意．

A novel, simple and economic sample pretreatment system based on reflux extraction was developed for the determination of wear metals in the used aviation lubricating oil by using a simultaneous microwave plasma torch atomic emission spectrometer（MPT-AES）. The operating parameters for both sample pretreatment and analysis were studied and optimized. The detection limits are 0. 084, 0. 043, 0. 022, 0. 052, 0. 064 μg/g for Zn, Cd, Cu, Fe and Pb, respectively. The relative standard deviations are less than 5% （n = 5） , and the recovery ratios of these elements are in the range of 94. 5%-107.4%. The new system was suecessfully applied to the analysis of the lubricating oil samples.