Development of a hand wipe method for PAHS using corn oil and modified NIOSH method 5506.
Boeniger-M; Neumeister-C; Booth-Jones-A
American Industrial Hygiene Conference and Exposition, May 10-15, 2003, Dallas, Texas. Fairfax, VA: American Industrial Hygiene Association, 2003 May; :40
Polyaromatic hydrocarbon (PAR) compounds are present in a variety of petrochemical mixtures to which workers are potentially exposed. We identified a need for an efficient and sensitive sampling method for determining PAHs on the skin and other surfaces. One approach that has previously been used applied food grade com oil to the skin, removing oil and any PAHs on the skin by sorption with a Whatman filter paper and liquid chromatographic analysis. We have optimized NIOSR Method 5506 for analysis of pyrene and benzo[ a ]pyrene in com oil, using maximum fluorescence excitation and emission frequencies of 328/394 nm and 365/410 nm, respectively. These are two predominant PAHs used in gasoline engine oil (UGEO) that we have measured at concentrations up to 0.1 % w/v, thus representing a potential hazard to automotive repair technicians. Using the optimized conditions for detection of pyrene and benzo[a]pyrene, the lower limit of detection and limit of quantification (LOD/LOQ) was determined to be approximately 0.6 ng/2 ng per 100 uL and 3 ng/10 ng per 100 uL, respectively. Next, a number of possible wiping materials were evaluated for background contamination and recovery efficiencies including Whatman filter paper, paper towels, cotton gauze, and a highly absorbent non-woven polyester fabric (Tex-wipes). There were no background levels of PAHs in any of these media and recovery was acceptable for each. We then applied known amounts of UGEO that were characterized for pyrene and BaP onto volunteers hands and asked them to wipe them with the polyester wipes (3 concentrations) or Whatman filter paper (1 concentration) with three consecutive wipes that were analyzed individually to determine relative and absolute analyte recovery. Most of the applied UGEO was recovered in the first wipe, but combining up to three consecutive wipes will increase quantification of PAHs residing on the skin.
Hydrocarbons; Workers; Occupational-exposure; Exposure-levels; Sampling-methods; Chromatographic-analysis; Analytical-methods; Mechanics; Automobile-repair-shops
Research Tools and Approaches: Exposure Assessment Methods
American Industrial Hygiene Conference and Exposition, May 10-15, 2003, Dallas, Texas