I am working in pesticide residues analysis. I need to know about the different methods for conversion of cotton lint into cotton powder to determine the pesticide residues in it.
you need to dry it by freezing. i tried liquid nitrogen once but it did not appeal to me too much. the grinding machine did not work. so i shifted to keeping it in freezers for weeks. it was tedious and unsuccessful. what is left an instrument using the freezing shock. but was not available at time.