Pulp quality monitoring

The method is disclosed to monitor hydrophobic particles contained in a pulp suspension， and the method includes obtaining 601 a sample from the pulp suspension or a filtrate of the pulp suspension. A dye is added to the sample to color the particles in the sample (602)， and the dye is a fluorescent dye. The sample is classified to obtain at least a first fraction and a second fraction (603)， and the second fraction is a fibrous fraction. The method comprises the steps of measuring the fluorescence emitted by particles in the fractions (604) for the obtained fractions， and calculating the integral of the measured fluorescence for the fractions excluding the fiber classification (605). And correlating (606) the integral fluorescence calculated for the amount of acetone soluble material in the pulp suspension， and selectively measuring the light scattering signal of the particles in the at least first and second fractions. Include as. A method is disclosed for monitoring hydrophobic particles contained in a pulp suspension， the method comprising obtaining (601) a sample from a pulp suspension or a filtrate of the pulp suspension. A dye is added (602) to the sample to stain particles in the sample， wherein the dye is a fluorescent dye. The sample is fractionated (603) to obtain at least a first fraction and a second fraction， wherein the second fraction is a fiber fraction. The method further comprises measuring (604)， for the obtained fractions， fluorescence emitted by the particles in said fractions， calculating (605) an integral of the fluorescence measured for the fractions excluding the fiber fraction， and correlating (606) the calculated integral of the fluorescence to the amount of acetone soluble material in the pulp suspension， and optionally measuring light scattering signal of the particles in said at least first and second fractions. A method is disclosed for monitoring hydrophobic particles contained in a pulp suspension， the method comprising obtaining (601) a sample from a pulp suspension or a filtrate of the pulp suspension. A dye is added (602) to the sample to stain particles in the sample， wherein the dye is a fluorescent dye. The sample is fractionated (603) to obtain at least a first fraction and a second fraction， wherein the second fraction is a fiber fraction. The method further comprises measuring (604)， for the obtained fractions， fluorescence emitted by the particles in said fractions， calculating (605) an integral of the fluorescence measured for the fractions excluding the fiber fraction， and correlating (606) the calculated integral of the fluorescence to the amount of acetone soluble material in the pulp suspension， and optionally measuring light scattering signal of the particles in said at least first and second fractions.