Chemistry: analytical and immunological testing – Metal or metal containing – Ti – zr – hf – va – nb – ta – cr – mo – w
Reexamination Certificate
2006-12-12
2006-12-12
Warden, Jill (Department: 1743)
Chemistry: analytical and immunological testing
Metal or metal containing
Ti, zr, hf, va, nb, ta, cr, mo, w
C436S074000, C436S053000
Reexamination Certificate
active
07148068
ABSTRACT:
A method is disclosed for determining the concentration of trivalent chromium Cr(III) in a sample. The addition of perchloric acid has been found to increase the atomic chromium spectrometric signal due to Cr(III), while leaving the signal due to hexavalent chromium Cr(VI) unchanged. This enables determination of the Cr(III) concentration without pre-concentration or pre-separation from chromium of other valences. The Cr(III) concentration may be measured using atomic absorption spectrometry, atomic emission spectrometry or atomic fluorescence spectrometry.
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A. Reheulishvilli et al, Determination of the Content of Cr(VI) by the Method of Flame Atomic Absorption and Atomic Fluorescent Spectrometry (2002), Bulletin of the Georgian Academy of Sciences, 3, 501-504.
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Technical Report of the 8th Quarter—Project G-348, issued Sep. 30, 2002.
Reheulishvili Aleksandre N.
Tsibakhashvili Neli Ya.
Gottlieb Paul A.
Lucas John T.
Moss Keri
Warden Jill
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