Chemistry: analytical and immunological testing – Testing of catalyst
Reexamination Certificate
2011-03-08
2011-03-08
Gakh, Yelena G (Department: 1777)
Chemistry: analytical and immunological testing
Testing of catalyst
C436S079000, C436S080000, C436S084000, C436S166000, C436S172000, C436S173000, C436S174000, C356S316000, C356S318000, C250S288000
Reexamination Certificate
active
07901940
ABSTRACT:
A method is provided for measuring the concentration of a catalytic clement in a fuel cell powder. The method includes depositing on a porous substrate at least one layer of a powder mixture comprising the fuel cell powder and an internal standard material, ablating a sample of the powder mixture using a laser, and vaporizing the sample using an inductively coupled plasma. A normalized concentration of catalytic element in the sample is determined by quantifying the intensity of a first signal correlated to the amount of catalytic element in the sample, quantifying the intensity of a second signal correlated to the amount of internal standard material in the sample, and using a ratio of the first signal intensity to the second signal intensity to cancel out the effects of sample size.
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Matlin Ramail
Shore Lawrence
BASF Corporation
Gakh Yelena G
Hixson Christopher A.
Lau Bernard
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