Chemistry: analytical and immunological testing – Metal or metal containing
Patent
1992-02-28
1994-03-15
Housel, James C.
Chemistry: analytical and immunological testing
Metal or metal containing
436 77, 436 80, 422 681, 422 78, G01N 3320
Patent
active
052945545
ABSTRACT:
In electroless or electric tin, lead or tin-lead alloy plating solution which may contain copper, the concentration of a metal ion component selected from divalent tin ion, lead ion, and copper ion is quantitatively determined by taking a sample from the solution, adding a chemical agent, for example, an oxidizing agent to the sample, thereby causing the selected metal ion to develop its color, measuring the absorbance of the sample due to the metal ion by colorimetry, and determining the concentration from the absorbance. A choice of chemical agent depends on a particular metal ion on analysis. When the solution contains more than one metal ion, correction is made by repeating the process using another chemical agent.
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Hotta Teruyuki
Kamitamari Tohru
Kiso Masayuki
Kubo Motonobu
Uchida Hiroki
C. Uyemura & Co., Ltd.
Housel James C.
Pyon Harold Y.
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