Chemistry: analytical and immunological testing – Including titration or ph determination
Reexamination Certificate
2005-05-10
2005-05-10
Ludlow, Jan M. (Department: 1743)
Chemistry: analytical and immunological testing
Including titration or ph determination
C436S051000, C436S111000, C436S112000, C436S124000, C436S125000, C436S128000, C436S150000
Reexamination Certificate
active
06890758
ABSTRACT:
The concentration of citrate complexing agent in an electroless cobalt or nickel plating bath is determined by titrating a sample of the electroless plating bath containing a small concentration of free fluoride ion with a standard lanthanum nitrate solution. During the titration, La3+ion first reacts preferentially with the citrate complexing agent and then with fluoride ion, which reduces the free fluoride ion concentration. The endpoint for the titration is indicated by a substantial decrease in the free fluoride ion concentration, which is detected via a fluoride ion specific electrode (ISE). The method can be used for analysis of other complexing agents.
REFERENCES:
patent: 4541902 (1985-09-01), Kinoshita et al.
patent: 6673226 (2004-01-01), Bratin et al.
patent: 6709561 (2004-03-01), Pavlov et al.
Efstathiou and Hadjiioannou, Analytica Chim. Acta109, 319 (1979).
Bratin Peter
Kogan Alex
Pavlov Michael
Perpich Michael James
Shalyt Eugene
ECI Technology Inc.
Ludlow Jan M.
Tench D. Morgan
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