Effect of chlorine-containing bleaching agents on diffuse reflection of light by cellulose pulp

We have studied diffuse reflectance in the spectral range λ = 380–760 nm of sulfate cellulose pulp with initial hardness G = 30–70 after it was treated with a chlorine-containing bleaching agent with active chlorine concentration C = 0%–10% for different time intervals. We determined the general behavior and basic features of the concentration and time dependences of the brightness B and the diffuse reflectance spectral ratio ( R 437 / R 650 )⋅100% at λ = 457 nm and 650 nm. Based on the data obtained, we propose an optimal algorithm for using optical spectral technologies for metered addition of chlorine-containing bleaching agents.