Summary
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.
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García-Antón, J., Grima, R. Determination of zinc in lubricating oil by polarography of emulsified samples. Fresenius J Anal Chem 343, 905–906 (1992). https://doi.org/10.1007/BF00321966
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DOI: https://doi.org/10.1007/BF00321966