Diffuse reflection of light by cellulose pulp and optical absorption of aqueous residual lignin solutions

Within Kubelka–Munk theory using the Lorenz relations, we have determined the correlation between the optical diffuse reflectance spectra R (λ) of cellulose pulp in the visible range (380–760 nm) and ultraviolet absorption (λ = 200–400 nm) of aqueous solutions containing residual lignins. The data obtained can be used to monitor and predict the results of digestion and bleach plants in the paper and pulp industry.