, Volume 343, Issue 12, pp 905-906

Determination of zinc in lubricating oil by polarography of emulsified samples

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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.