Determination of zinc in lubricating oil by polarography of emulsified samples
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- García-Antón, J. & Grima, R. Fresenius J Anal Chem (1992) 343: 905. doi:10.1007/BF00321966
A new polarographic determination of zinc in lubricating oils is based on the formation of an oil/toluene-water emulsion and bubbling nitrogen through the emulsion. A well developed peak appears at −1440 mV. The precision is ±3% for a sample with 382 mg Zn/kg.