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Results of the practice rounds of the passive monitor proficiency analytical testing program.
Esche-CA; Groff-JH; Schlecht-PC
American Industrial Hygiene Conference and Exposition, May 19-23, 1997, Dallas, Texas. Fairfax, VA: American Industrial Hygiene Association, 1997 May; :46
The Passive Monitor Proficiency Analytical Testing Program began in July 1996 to evaluate the ability of laboratories to analyze passive monitors. The program provides each participating laboratory a passive monitor sample kit containing two samples and a blank twice a year. The first year of the program will be used to establish proficiency testing performance criteria and will not affect accreditation status of participating laboratories with the American Industrial Hygiene Association (AIHA). On the first round, 164 passive monitors containing benzene, toluene, and o-xylene were sent to 148 participating laboratories. One-hundred thirty-five (83%) were 3M monitors, 17 (10%) were SKC monitors, and 12 (7%) were Assay Technology monitors. Passive monitor reference values are calculated values based upon the vapor pressure of the organic solvent and generator temperature, and are compared with active sampler results conducted prior to shipping samples to participants. A 6% relative standard deviation (RSO) is used to establish three sigma acceptable performance limits of plus or minus 18% of the corresponding reference value. This compares with an average 5% RSD over the last five years in the Proficiency Analytical Testing Program for active charcoal tube samplers. Approximately 66 to 87% of reported results on the first round were within acceptable performance limits calculated by the National Institute for Occupational Safety and Health (NIOSH). The first round demonstrated no important differences in performance among the three passive monitor types. However, problems were encountered with all three monitors regarding the information that is provided by monitor manufacturers to calculate correct air concentrations.
Analytical-methods; Laboratories; Monitors; Benzenes; Toluenes; Vapors; Solvents; Temperature-effects; Laboratory-testing; Analytical-processes
American Industrial Hygiene Conference and Exposition, May 19-23, 1997, Dallas, Texas