Chemistry: analytical and immunological testing – Metal or metal containing
Reexamination Certificate
2006-10-24
2011-11-08
Warden, Jill (Department: 1773)
Chemistry: analytical and immunological testing
Metal or metal containing
Reexamination Certificate
active
08053241
ABSTRACT:
A novel reagent is used to identify arsenic-treated wood. The stain may detect arsenic extracted from wood into solution; arsenic transferred from wood to a wipe, which is then extracted into solution; or the stain may be directly applied at a predetermined location on the wood's surface. Copper preservatives are not detected by the stain and phosphate interference is minimized. The process is quick, inexpensive, and easy to use. Development of a blue color (i.e., reduction of at least some Mo (VI) to Mo (V) in molybdenum blue) indicates the presence of arsenic.
REFERENCES:
patent: 5330917 (1994-07-01), Stone
patent: 373599 (1970-03-01), None
Truog, E., A.H. Meyer, Improvments in the Deige Colormetric Method for Phosphorous and Arsenic, Mar. 1, 1929, Analytical Edition, vol. 1, No. 3, pp. 136-139.
Lepage “Chemical methods for the determination of preservatives in wood”Instituto de Pesquisas Tecnologicas Sao Paolo-Brasil, Publication No. 893, pp. 49-65 (1970).
Chen et al. “Methods for rapid multi-element analysis in the field and their applications IV. Determination of arsenic and cadmium”Rock and Mineral Analysis, vol. 23, No. 1, pp. 25-28 (Mar. 2004).
Anchieta et al. “Spectrophotometric detection of arsenic using flow-injection hydride generation following sorbent extraction preconcentration”Talanta, vol. 50, pp. 959-966 (1999).
Khan et al. “Arsenic speciation of solvent-extracted leachate from new and weathered CCA-treated wood”Environmental Science&Technology, vol. 38, pp. 4527-4534 (Jul. 2004).
Int'l Search Report for PCT/US2006/041393.
Written Opinion for PCT/US2006/041393 mailed Mar. 27, 2007.
Omae Amy L.
Solo-Gabriele Helena M.
Townsend Timothy G.
Cole Monique
Nixon & Vanderhye P.C.
The University of Miami
Warden Jill
LandOfFree
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