There are several ways to tell if sodium carboxymethyl cellulose has gone bad:
1. Observe the appearance: Check if the color of sodium carboxymethyl cellulose has changed, such as yellowing, blackening and other abnormal colors; check if there are lumps, moisture and other phenomena.
2. Check solubility: Add sodium carboxymethyl cellulose to water and observe its dissolution. If the dissolution rate slows down, the dissolution is incomplete or precipitation is generated, it may indicate that its quality has changed.
3. Test viscosity: Use a viscometer to measure the viscosity of sodium carboxymethyl cellulose solution. If the viscosity is significantly lower than normal, it may indicate that its performance has been affected.
4. Check the smell: Smell the sodium carboxymethyl cellulose for any peculiar smell. If there is a pungent or unpleasant smell, it may be a sign of deterioration.
5. Perform chemical analysis: Chemical analysis methods can be used to detect whether the chemical composition of sodium carboxymethyl cellulose has changed to determine whether it has deteriorated.
It should be noted that the storage conditions of sodium carboxymethyl cellulose will also affect its quality. It should be stored in a dry and cool place to avoid moisture, heat and contact with other chemicals. If you suspect that sodium carboxymethyl cellulose has deteriorated, it is best not to use it to avoid affecting product quality or causing adverse consequences.
