A simplified sampling technique for use with the Weisz ring oven: application to qualitative analysis of some gold and silver alloys.
Up to 100 microg of sample can be collected from gold or silver alloys by rubbing the specimen with the ground hemispherical tip of a 4-mm Pyrex glass rod. Gold alloys are then dissolved in potassium cyanide solution containing hydrogen peroxide; silver alloys are exposed to vapours of nitric acid. Procedures for transfer, ring oven separation and identification of alloy constituents in the sample solutions are described.
Ottendorfer
L J
LJ
Microanalytical Chemistry Unit, National Research Centre, Dokki, Cairo, United Arab Republic.
Gawargious
Y A
YA
Hassan
S S
SS