Paper and paperboard - Determination of titanium dioxide content
The content of titanium dioxide in paper and board can be determined by the following methods:
Colorimetric method: reduce the titanium dioxide in the sample with a reducing agent, and then react the reduced titanium dioxide with catechol to generate a blue compound with an absorption peak, and calculate the content of titanium dioxide by measuring the absorbance by colorimetry.
X-ray fluorescence spectrometry: The characteristic X-ray of titanium dioxide in the sample is detected by an X-ray fluorescence analyzer, and the content of titanium dioxide is calculated according to its intensity.
Atomic absorption spectrometry: reduce the titanium dioxide in the sample to titanium ions, then use an atomic absorption spectrometer to detect the content of titanium ions, and calculate the content of titanium dioxide according to the intensity of its absorption peak.
These methods can be determined in the laboratory using conventional equipment and reagents.
