title: A simplified sampling technique for use with the Weisz ring oven: application to qualitative analysis of some gold and silver alloys.
abstract: 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.
authors.affiliation: Microanalytical Chemistry Unit, National Research Centre, Dokki, Cairo, United Arab Republic.
authors.forename: L J
authors.initials: LJ
authors.lastname: Ottendorfer
authors.forename: Y A
authors.initials: YA
authors.lastname: Gawargious
authors.forename: S S
authors.initials: SS
authors.lastname: Hassan