A time frame for sampling potentially exposed employees is also outlined. When two large charcoal tubes are used, each section is desorbed separately for a total of four quantitations per sample.
Separate desorption is necessary due to the increased quantity of charcoal.
Small tubes for methylene chloride are charged at the list price. Large tubes are charged at two times the list price. Because of the increased detection limit, be sure to use large size tubes only when needed.