DETERMINATION OF ANIONIC SPECIES CONCENTRATION BY NEAR INFRARED SPECTROSCOPY

摘要

A method for determining the concentration of anionic species selected fromthe group consisting of OH-, CO3= and HS- and of organic species in an aqueoussample solution, said method comprising subjecting said solution to nearinfrared radiation at a wavelength region of wave numbers selected from about7,000 to 14,000 cm-1 through a solution path length of at least 3 mm to obtainspectral data for said solution; obtaining comparative spectral data for saidanionic species at known concentrations in aqueous solutions; and correlatingby multivariate calibration the relationships between said spectral data ofsaid sample solution and said comparative spectral data to determine saidconcentration of said anionic species in said sample solution. The method isof particular value for use with pulp liquor determination and control inregards to the rapid and accurate determination of the OH-, HS- and CO3=anionic species and of organic species present in pulp liquor.