Chemistry: analytical and immunological testing – Including sample preparation – Liberation or purification of sample or separation of...
Reexamination Certificate
2006-12-26
2006-12-26
Warden, Jill (Department: 1743)
Chemistry: analytical and immunological testing
Including sample preparation
Liberation or purification of sample or separation of...
C210S263000, C210S264000, C210S660000, C210S681000, C210S688000, C422S067000
Reexamination Certificate
active
07153698
ABSTRACT:
A method and test for field sample arsenic speciation in aqueous solutions, in particular, arsenic speciation in drinking water, is described. In particular, the method and test uses in series three columns wherein the first column removes interfering cations from water, the second column removes dimethylarsenate (DMA) from the water, and the third column removes As(V) (collectively H3AsO4/H2AsO4−/HAsO42−/AsO43−) and monomethylarsinate (MMA) while As(III) (collectively H3AsO3/H2AsO3−/HAsO32−/AsO33−) remains in the water effluent. The bound arsenic species are separately eluted from the columns in a laboratory and then each of the eluants and the effluent are tested for the arsenic species, preferably using graphite furnace atomic absorption spectroscopy.
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patent: 2003/0132155 (2003-07-01), Litz et al.
Nakazato et al., “Determination of arsenite, arsenate, and monomethylarsonic acid in seawater by ion-exclusion chromatography combined with inductively coupled plasma mass spectrometry using reaction cell and hydride generation techniques”, Aug. 16, 2002, Elsevier Science, vol. 58, No. 1, pp. 121-132.
Flores del Pino Lisveth V.
Havezov Ivan
Long David T.
Voice Thomas C.
Board of Trustees of Michigan State University
Hyun Paul
McLeod Ian C.
Merritt Steven E.
Warden Jill
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