So industrial lignin precipitated from Kraft pulp tends to have a lot of inorganics and salt which hinder their application. So what method can be applied to quantify the amount of salt present in industrial lignin?
In general you need to burn it down to measured gravimetrically the ash content that will give you the "amount of salt".
Have a look at attached procedure.
The amount of inorganics is usually measured by burning your sample on a flame or in a oven and measuring the weight of your sample before and after. However, the temperature used for the oven depends on the type of sample you are measuring. If it is kraft lignin then I believe you can get away with using 525-575 °C (see TAPPI methods). Lignosulfonates (from my experience) need higher temperatures to completely decompose the sample (800 - 900 °C). https://research.cnr.ncsu.edu/wpsanalytical/documents/T211.PDF
If you need more specific information about the type of salts then you will have to consider atomic absorption spectroscopy or/and HPLC.
Best of luck!
- Badges
- Science topic
- Similar topics
- Chemistry
- Sulfites
- Inorganic Chemistry
- Inorganic Chemicals
- Salts