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 β-CHLOROPRENE: METHOD 1002, Issue 2, dated 15 August 1994 - Page 4 of 4 Several breakthrough studies were done. With 94% relative humidity, breakthrough occurred at 30 min when sampling 0.194 L/min of 195 mg/m 3 (5.8 L). With 91% relative humidity, no breakthrough occurred after 240 min when sampling 0.045 L/min of 197 mg/m 3 (10.8 L).

REFERENCES: [1] Criteria for a Recommended Standard-Occupational Exposure to Chloroprene, Appendices I and III, U.S. Department of Health, Education, and Welfare, Publ. (NIOSH) 77-210 (1977). [2] NIOSH Backup Data Report, S112, prepared under NIOSH Contract 210-76-0123, available as "Ten NIOSH Analytical Methods, Set 1," Order No. PB 271-712 from NTIS, Springfield, VA 22161. [3] Grote, A. Sequence 7239 and 7316 Reports, DPSE/MRSB internal reports (unpublished) (1991). [4] NIOSH Manual of Analytical Methods, 2nd ed., V. 2, S112, U.S. Department of Health, Education, and Welfare, Publ. (NIOSH) 77-157-B (1977). [5] NIOSH Research Report-Development and Validation of Methods for Sampling and Analysis of Workplace Toxic Substances, U.S. Department of Health and Human Services, Publ. (NIOSH) 80-133 (1980).

METHOD REVISED BY: Y. T. Gagnon, NIOSH/DPSE; S112 originally validated in NIOSH Contract 210-76-0123.

NIOSH Manual of Analytical Methods (NMAM), Fourth Edition, 8/15/94