Carboxymethyl cellulose (CMC) moisture and volatile content can be determined by oven drying method, the specific steps are as follows:
Take a sample with accurate weight and record its weighing mass (m1);
Put the sample in an oven at 105°C and dry it to constant weight (that is, the mass change within 5 minutes of continuous weighing is less than 0.5%), and record its weighing mass (m2);
Calculate the percentage of moisture content: moisture content (%) = (m1 - m2) / m1 × 100%;
Put the dried sample into an oven at 550°C and burn it to constant weight, and record its weighing mass (m3);
Calculate the percentage of volatile content: Volatile content (%) = (m2 - m3) / m1 × 100%.
Beichao reminds you: this method is only applicable to the determination of water-soluble polymers such as CMC, and different determination methods may be required for other types of substances.
