Abstract
A direct solvent extraction-gas chromatographic method was developed for the determination of organophosphorus compounds as additives in lubricating oil for control purposes. Ethanol (95%) was used as an extractant and Varian GC-Vista 6000 gas chromatograph with a 3% OV-17 column and dual flame photometric detector was used for the measurements under the optimum experimental conditions. The accuracy and precision of the method were determined by preparing model samples of different types of engine lubricating base oils blended with different amounts of triphenyl phosphate or p-tricresyl phosphate ranging from 0.002 to 1.0% (w/w), which correspond to 2.12–955 ppm of phosphorus. The results showed errors ranging from 0.40 to 2.96% and the relative standard deviation did not exceed 3%. This method was applied successfully to the determination of phosphorus compounds in different types of lubricating oils. Each sample requires 20 min for analysis and 72 samples can be analysed per 8-h day. The effect of storage on the amount of phosphorus as an additive in lubricating oils was also considered.
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