Rapid determination of zinc in grease by fluorescent X-ray spectrography

Abstract

Rapid determination of zinc in grease was investigated by fluorescent X-ray spectrography. Two equal quantities of a sample were weighed out. One was dissolved in dithizone-chloroform solution, and the other in zinc-dithizone-chloroform solution. Two pieces of filter paper were separately soaked in each solution and dried. The amount of zinc in the sample was calculated from fluorescent X-ray intensities of these filter papers using standard-addition-method.
The method was applied to the analysis of samples containing 0.007 to 0.24% of zinc, and the results were in good agreement with those by chemical method. The time required for an analysis was about forty minutes.