Chemistry: analytical and immunological testing – Metal or metal containing
Patent
1996-04-15
1998-03-03
Soderquist, Arlen
Chemistry: analytical and immunological testing
Metal or metal containing
436 80, 436171, 436175, 436178, G01N 3320, G01N 2174, G01N 100
Patent
active
057233390
ABSTRACT:
A method of analyzing for As(III) as AsO.sub.2.sup.-1 ion in an Au(I) containing electroplating solution. The concentration of As(III) in the electroplating solution is maintained high enough to avoid formation of "burnt Au" oxides but low enough to avoid bond failures. A sample of the electroplating solution is withdrawn and added to a buffered solution, for example an acetate-ethylene diamine tetraacetic acid (EDTA) buffered solution. A complexing agent for Au(I) ion is added to the buffered solution. This can be an alkali metal cyanide. Next ammonium pyrrolidine dithiocarbamate is added as a complexing agent for the AsO.sub.2.sup.-1 ion. The ammonium pyrrolidine dithiocarbamate--AsO.sub.2.sup.-1 ion is extracted, for example with methyl isobutyl ketone (MIBK). The extract is analyzed for As(III) by atomic absorption, as electrothermal atomic absorption spectrometry.
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Konrad John Joseph
Sinicki Robert Anthony
Goldman Richard M.
International Business Machines - Corporation
Soderquist Arlen
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