Common measurement indicators in pulp bleaching liquor include bleaching degree, residual bleaching agent content, redox property, pH value, etc. The specific methods are as follows:
Determination of bleaching degree: standard colorimetric method or bleaching degree meter method is used to compare the pulp samples before and after bleaching with standard samples, and calculate the bleaching degree according to the colorimetric results.
Determination of residual bleaching agent content: According to different types of bleaching agents, different determination methods are used, such as chloride ion selective electrode method, iodate reduction method, hydrogen peroxide titration method, etc.
Oxidation-reduction determination: Use a reducing agent to perform a reduction reaction on the bleaching solution, and use a titration method to measure the amount of the oxidant, thereby calculating the oxidation-reduction index.
pH value measurement: Use glass electrode or indicator titration method to measure the pH value of the bleaching solution.
NBCHAO reminds you: During the measurement process, you should pay attention to standard operations to avoid affecting the accuracy of the results due to differences in measurement methods, equipment, and sample preparation. At the same time, pay attention to safe operation to avoid chemicals causing harm to the human body.
