The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jan. 15, 2002
Filed:
May. 19, 1999
Michael Kester, Richmond, CA;
Denys F. Leclerc, Vancouver, CA;
Thanh P. Trung, Vancouver, CA;
Edward A. Dylke, Prince George, CA;
Other;
Abstract
A method for determining the concentration of hydrogen ion, organic anionic species and anionic species selected from the group consisting of OH , CO , HS , ClO , SO , S O , polysulphide and peroxide in an aqueous sample solution, said method comprising subjecting said solution to near infrared radiation at a wavelength region of wave numbers selected from about 7,000 to 14,000 cm through a solution path length of at least 3 mm to obtain spectral data for said solution; obtaining comparative spectral data for said anionic species at known concentrations in aqueous solutions; and correlating by multivariate calibration the relationships between said spectral data of said sample solution and said comparative spectral data to determine said concentration of said anionic species in said sample solution. The method is of particular value for use with pulp liquor determination and control in regards to the rapid and accurate determination of the OH , HS , CO , ClO , SO , S O , polysulphide and peroxide anionic species, hydrogen cation and of organic species present in pulp liquor.