Page:NIOSH Manual of Analytical Methods - 5040.pdf/5

 ELEMENTAL CARBON (DIESEL PARTICULATE): METHOD 5040, Issue 3, dated 15 March 2003 - Page 5 of 5 EVALUATION OF METHOD: Deta ils on the evaluation of this method are provided in a chapter of this NMAM Supplement. [2] The chapter includes a summ ary of interlaboratory comparison work conducted since the initial publication of the method. Background information and guidance on m ethod use, including sam pling requiremen ts, also are provided. In general industry, 37-mm cassettes are no rm ally suitable for air s am pling, but there are ex cep tions. A cyclone in series with an impactor having a submicrometer cutpoint must be used in coal mines, and the Mine Safety and Health Administration (MSHA) has recomm ended use of a cyclone-impactor sampler in metal and nonmetal m ines. [5 ] The im pacto r is c om m ercially available [6]. A size-selective sampler (either impactor and/or cyclone) also may be required in other dusty environments [2], particularly if the dust is carbonaceous. If a sample contains carbonate, the carbonate carbon (CC) will be quantified as OC. A carbonate-subtracted result can be obta ined through acidificatio n of the sam ple portion or through separate integration of the carbon ate peak [2] (note: Trona and other compounds containing sodium can etch the quartz oven wall at elevated temperatures. Avoid spillage of these materials in the sample oven.) These procedures are described in a Chap ter of th is Supplem ent. [2] The thermal-optical method is applicable to nonvolatile carbon species (i.e., particulate OC, CC and EC). The method is not appropriate for volatile or semivolatiles, which require sorben ts for efficient collection.

REFERENCES: [1] AC GIH [2001]. Cincinnati, O H: Am erican C onference of Environm ental Industrial Hygienists. Diesel Exhaust (Particulate and Particulate Adsorbed Com ponents), Draft TLV-TW A Docum ent, 2001. NOTE: Recently, diesel exhaust has been taken off the ACGIH Notice of Intended Changes list. See referenc e [2]. [2] NIOSH [2003]. Manual of Analytical Methods (NMAM). O’Connor PF, Schlecht, PC, Monitoring of Diesel Particulate Exh aus t in the W ork place, Chap ter Q, Third Su pplem ent to NM AM, 4 th Edition, NIOSH, Cinc innati, OH. DH HS (NIO SH ) Publication No. 2003-15 4. [3] Birch, ME, C ary, RA [1996]. Elemental Carbon-based Method for Monitoring Occupational Exposures to Pa rticulate D iesel Exhaust A erosol Sci T echnol 25:221-241. [4] Birch, ME [1998]. Analysis of carb ona ceo us a eros ols: interlaboratory com parison, A nalyst, 123:851-857. [5] Mine Safety and Health Adm inistration (MSH A) [20 01]. D epa rtm ent o f Labor, 30 CFR Part 57, Diesel Particulate Matter Exposure of Underground Metal and Nonm etal Miners; Final Rule, Federal Register Vol. 66, No. 13, January 19. [6] SK C, E ight Sixty Three V alley View Road, E ighty Fo ur, PA 153 30.

METHOD WRITTEN BY: M. Eileen Birch, Ph.D., NIOSH/DART

NIOSH Manual of Analytical Methods (NMAM), Fourth Edition