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- Title
Analysis of Zinc Dialkyldithiophosphate Additives in Commercial Lubricating Oil using Matrix Assisted Laser Desorption/Ionization-Time of Flight Mass Spectrometry.
- Authors
Sangvanich, Polkit; Tungcharoen, Jannate; Petsom, Amorn
- Abstract
The zinc dialkyl/aryl dithiophosphates (ZDDPs) are multifunctional lubricating oil additives. In this research, the analysis of ZDDPs additive in lubricating oils using Matrix Assisted Laser Desorption/Ionization Time-of-Flight (MALDITof) has been developed. The complexes [Zn(DTP)(DMSO)2]+ from reaction between zinc dithiophosphate with dimethylsulfoxide were prepared. Analysis parameters for MALDI-Tof MS have been investigated; types of matrix and analyte: matrix ratio. The optimum condition of the analysis is dithranol as a matrix with tetrahydrofuran as solvent and the ratio of [Zn(DTP)(DMSO)2]+ to matrix is 1:75 by volume. And then, this developed method is applied for the analysis of ZDDPs additive in a commercial lubricating oil. Moreover, the results also suggested that additives in commercial lubrication oils can be separated to two groups; zinc dialkyldithiophosphates and zinc diaryldithiophosphates. Consequently, the pattern of ZDDPs can be used as a tool for producers of commercial lubricating oil products.
- Subjects
LUBRICATING oils; MATHEMATICAL complexes; DIMETHYL sulfoxide; ADDITIVES; LUBRICANT additives
- Publication
Acta Chimica Slovenica, 2008, Vol 55, Issue 3, p582
- ISSN
1318-0207
- Publication type
Article