Chemistry: analytical and immunological testing – Metal or metal containing – Cu – ag – au
Reexamination Certificate
2008-05-27
2008-05-27
Soderquist, Arlen (Department: 1797)
Chemistry: analytical and immunological testing
Metal or metal containing
Cu, ag, au
C422S067000, C436S073000, C436S076000, C436S166000, C436S172000, C436S182000
Reexamination Certificate
active
10354990
ABSTRACT:
A method of measuring the concentration of metal ions in a sample comprising the steps of: providing a sample comprising a nonpolar, liquid hydrocarbon, suspected of containing a metal ion; adding a dye such as a spirobenzopyran dye or bathocuproine and a reducing agent to the sample; wherein the dye forms a complex with the metal ion; wherein the complex has a spectral shift in light absorbance relative to the dye; observing the spectral shift; and calculating the concentration of the metal ion in the sample.
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Collins Gregory E
Lu Qin
Morris Robert E
Grunkemeyer Joseph T.
Karasak John J.
Soderquist Arlen
The United States of America as represented by the Secretary of
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