日本金属学会誌

J. Japan Inst. Metals, Vol. 21, No. 4 (1957),
pp. 199-203

Preparation of Briquetted Samples for Spectrochemical Analysis of Non-Ferrous Metals

Nakaaki Oda, Nagaharu Morioka and Sadayuki Tunoo


Abstract:

Some of the materials submitted to our spectrographic laboratory for analysis are in the forms of powder,grains chips, and scraps which are not suitable for electrodes in condensed spark tests from the viewpoint of sample shape and segregation of impurities in metal.If the sample ingot is not uniform due to the segregation effect, fine sample chips or drilling are collected from various positions including the representative constituents of ingot, by means of grinding, shaving or double boring technique. The obtained fine drilling, shaving or grinding materials are pulverized into the range of 40∼100 meshes. This powder may be briquetted (40∼80 kg/cm2 for Pb and Zn) into solid rods presenting a homogenous surface for spark excitation, under which condition accurate analysis can be made spectrochemically as well as cast and machined metal electrodes. A briquetting die for making solid rods of 5 mm in diameter and 25 mm in length is described. A comparison of briquetted rod and cast rod on zinc and lead showed that the precision, the accuracy and the spectral sensitivity obtained by this briqette method are comparable with those obtained by the conventional cast electrode method. This technique can be applied also to preparation of spectrochemical standard metal electrodes.


(Received 1956/9/17)

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