Research into Problems with NIOSH Method 2520 for Methyl Bromide.
Gagnon-YT; Ringenburg-VL; Fajen-JM
NIOSH 1994 Aug:26 pages
As part of an industry wide study in the fumigation industry, industrial hygiene evaluations were conducted at two structural fumigation facilities in Florida during July of 1990; difficulty was noted with NIOSH Method 2520 for methyl-bromide (74953). Sampling results indicated that methyl-bromide breakthrough had occurred. Some of the backup tubes contained greater amounts of methyl-bromide than the front sampling tubes. Several problems were discovered when reviewing the method. These included reduced adsorption capacity at high humidity, difficulty in preparing standard solutions, sample instability, decreasing recovery as the loading decreased, and insufficiently low quantitation limit. Several modifications were offered for methyl-bromide sampling. A maximum sample volume of one liter should be collected. The samples should be stored at minus 10 degrees-C or below until analysis. Samples should be analyzed within 6 days of collection. Methylene-chloride should be used as the desorption solvent rather than carbon- disulfide. Calibration should be against other brominated compounds. Before conducting air sampling, the conditions under which the analytical method was evaluated should be reviewed.
NIOSH-Author; Air-quality-monitoring; Air-sampling; Analytical-methods; Chemical-analysis; Analytical-chemistry; Organo-bromine-compounds;
NTIS Accession No.
NIOSH, U.S. Department of Health and Human Services, Cincinnati, Ohio, 26 pages, 12 references