(31)P-NMR Analysis of Zinc Dialkyl(Diaryl)-Dithiophosphate in Lubricating Oil

摘要

To assure that the oils furnished the government are of the same formulations as the oils originally qualified, a new method has been developed to examine Zinc dialkyl(diaryl)dithiophosphate (ZDDP) additives by using P-NMR. Two finished oils and primary alkyl-ZDDP, secondary alkyl-ZDDP, and aryl-ZDDP were examined. P-NMR was found to be a better method than other existing analytical methods to analyze the change of ZDDP additives in full formulated oil without pre-separation. (Author)