A distillation apparatus may be needed. Carbon disulfide, reagent grade. Source PDF, when possible, from the operation where sampling was done. GC grade hydrogen, air and nitrogen. Standard preparation 3.3.1.
Analytical standards are prepared in the desorbing solvent.
If source PDF is not submitted or is unusable, a non-source PDF from the laboratory should be used. Sample preparation 3.4.1. The glass wool and urethane plugs are discarded. One milliliter of desorbing solvent is added to each vial. The vials are immediately capped and shaken periodically for 30 min before analysis.