VINYL CHLORIDE: METHOD 1007, Issue 2, dated 15 August 1994 - Page 4 of 4 CALCULATIONS: 14.
15.
Determine the mass, µg (corrected for DE) of vinyl chloride found in the sample front (W back (W b) tubes, and in the average media blank (B). NOTE: If W b > W f/10, report breakthrough and possible sample loss. Calculate concentration, C, of vinyl chloride in the air volume sampled, V (L):
f
) and
EVALUATION OF METHOD: The method was evaluated with single 150-mg coconut shell charcoal tubes (100-mg front beds and 50-mg back) [1]. Atmospheres were generated at four concentrations between 1 and 64 mg/m 3. Recoveries, based on atmosphere concentrations calculated from the volumes of vinyl chloride and dilution air, averaged 94% with a pooled relative standard deviation ( SˆrT) of 0.06. Samples at the 3-µg level showed no loss of vinyl chloride when stored for 12 days at room temperature or 19 days at -20 °C. There may be significant loss of vinyl chloride from samples stored for 14 days at room temperature [4]. The 1% breakthrough capacity for a 150-mg bed of coconut charcoal, challenged at 100 mL/min with vinyl chloride in air at 16 mg/m 3 and a relative humidity of 70%, was 4.6 L [5].
REFERENCES: [1] [2] [3] [4] [5]
Hill, R. H., Jr., C. S. McCammon, A. T. Saalwaechter, A. W. Teass, and W. J. Woodfin. Anal. Chem., 48, 1395-1398 (1976). NIOSH Manual of Analytical Methods, 2nd. ed., V. 1, P&CAM 178, U.S. Department of Health and Human Services, Publ. (NIOSH) 77-157-A (1977). TLVs - Threshold Limit Values for Chemical Substances and Physical Agents in the Work Environment 1993-94 , ACGIH, Cincinnati, OH (1993). Cuddeback, J. E., W. R. Burg, and S. R. Birch, Environ . Sci. Technol ., 9, 1168-1171 (1975). Matsumura, Y. Ind. Health, 18, 61-67 (1980).
METHOD WRITTEN BY: A. W. Teass, Ph.D., NIOSH/DBBS.
NIOSH Manual of Analytical Methods (NMAM), Fourth Edition, 8/15/94
