Chemistry: electrical and wave energy – Processes and products – Processes of treating materials by wave energy
Patent
1992-03-24
1993-03-23
Niebling, John
Chemistry: electrical and wave energy
Processes and products
Processes of treating materials by wave energy
204413, 204405, 204434, G01N 2726
Patent
active
051960966
ABSTRACT:
A method for measuring concentrations of addition agents in solutions of additive mixtures, namely for monitoring additives in PbSn plating solutions, comprising the steps of: (a) preparing a basis solution which contains an electroactive species whose electroreduction reaction is sensitive to the additive of interest; (b) preparing calibration standard sample solutions comprising appropriate concentrations of all species other than the additive; (c) preparing the working solution whose additive concentration is to be determined; (d) applying a pulse voltammetry technique, at a hanging Hg drop electrode, to a sample of the basis solution located in a cell of a polarographic analyzer; (e) thereafter measuring the polarographic peak height for the indicator reaction in the basis solution; (f) adding a measured amount of the working solution to the basis solution sample in the cell; (g) thereafter measuring the peak height for the indicator reaction in the mixed solution of step (f); and (h) repeating steps (f) and (g) until the peak height has dropped to a constant value.
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Chang I-Chia H.
Horkans Wilma J.
Bell Bruce F.
International Business Machines - Corporation
Niebling John
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