determination of the concentration of anionic substances by means of near infrared spectroscopy in

摘要

A method for determining the concentration of anionic species selected from the group consisting of OH-, CO3= and HS- and of organic species 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-1 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- and CO3= anionic species and of organic species present in pulp liquor.