Water extract refers to the content of water-soluble and hot-water-soluble organic and inorganic substances in pulp. The commonly used determination method is the water extract determination method, and its main steps are as follows:
Sample preparation: Weigh a certain amount of pulp sample and record its weight, and put it into an extraction bottle.
Extraction: add an appropriate amount of deionized water, put the sample into a constant temperature Water Bath for extraction for a certain period of time. Usually the extraction temperature is 80°C-100°C, and the extraction time is 1-2 hours.
Filtrate: Filter the extract and collect the filtrate in a drying dish.
Drying: The collected filtrate was dried at constant temperature to constant weight.
Program heating: heat the dried sample to 105°C, keep the temperature for 1 hour, and bake until constant weight.
Cooling and weighing: take out the sample, place it in a Drying Oven to cool naturally, then weigh the sample and the drying dish again to obtain the weight of the water extract content of the sample.
Calculation: The formula for calculating the water extract content is: water extract content (%) = (sample water extract weight/sample weight) × 100%.
NBCHAO reminds you: In order to avoid errors in the measurement of water extracts, attention should be paid to the cleaning of the extracted liquid and filtrate, the accuracy of weighing, the control of heating temperature and time, and the drying and cooling time and other details.
