National Institute for Occupational Safety and Health, NIOSH Manual of Analytical Methods… (1994)
“ Place the front (include the initial glass wool plug) and back sorbent sections of the sampler in separate vials. Discard the foam plugs. Add 1.0 mL of the 2% isopropanol/carbon disulfide desorption solvent to each vial. Securely attach crim p caps to each vial. Allow to desorb for 30 m inutes with oc cas ional agitation. ”
National Institute for Occupational Safety and Health, NIOSH Manual of Analytical Methods… (1994)
“ NO TE: If W b > W f/10, report breakthrough and possible sample loss. Calculate conce ntration, C, of analyte in the air volume sam pled, V (L) : NO TE : :g/L= m g/m 3 EVALUATION OF METHOD: This method updates NMAM 1301, which was identified as a problematic gas chromatographic method from a survey of external users of the NIOSH Manual of Analytical Methods. This new method, by use of capillary column chrom atography coupled with an improved solid sorbent sampler and modified desorption solvent, resulted in improvements in LOD/LOQ, sample recovery and storage stability compared to NMAM 1301. ”
National Institute for Occupational Safety and Health, NIOSH Manual of Analytical Methods… (1994)
“ Ca librate daily with at leas t six wo rking standa rds to cover the an alytical range. If nece ssa ry, additional standards may be added to extend the calibration curve. a. Add known amounts of each analyte to the desorption solvent solution in 10-mL volumetric flasks and dilute to the m ark. Mix well. b. Analyze together with samp les and blanks (steps 11 and 12) . c. Prepare c alibration graph (pe ak area versus μg analyte) . Determine desorption efficiency (DE) at least once for each lot of Anasorb CMS used for sampling in the calibration rang e (ste p 8) . a. ”
