title: [Concentration levels and sources analysis of additives element in engine oil].
abstract: The present article adopts wavelength-dispersive X-ray fluorescence spectrometry to measure elements of P, S and C1 in 98 engine oil samples from America, Germany and Japan and including SM, SN, CI and CH API grade. Proportional relationship of Zn/P, S/Mo and Ca/Mg illustrated the correlation between experimental data and additive contents. The experiment indicates that the concentration levels of Zn, P, Ca, S, Mg and Mo were 0.09%-0.17%, 0.07%-0.15%, 0.13%-0.43%, 0.20%-0.47%, 0.04%-0.15% and 0.01%-0.05% respectively, among which the Ca, S, P and Zn were the main elements of engine oil, Mg and Mo exist in high quality level engine oil, while Nb, W, Ti and Na were present in individual engine oil.
authors.affiliation: Ningbo Entry-Exit Inspection & Quarantine Bureau, Ningbo 315000, China. wanglycos2000@sohu.com
authors.forename: Hao
authors.initials: H
authors.lastname: Wang
authors.affiliation: Ningbo Entry-Exit Inspection & Quarantine Bureau, Ningbo 315000, China.
authors.forename: Zhen-xing
authors.initials: ZX
authors.lastname: Lin
authors.affiliation: Ningbo Entry-Exit Inspection & Quarantine Bureau, Ningbo 315000, China.
authors.forename: Bei-lei
authors.initials: BL
authors.lastname: Wu