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Field comparison of impingers and treated filters for sampling of total aliphatic isocyanates with the MAP reagent.

Authors
Bello-D; Streicher-RP; Liu-YC; Sparer-J; Young-F; Woskie-SR
Source
Am Ind Hyg Assoc J 2002 Nov/Dec; 63(6):790-796
NIOSHTIC No.
20022409
Abstract
Results of a comparative field study on the performance of 25-mm inhalable samplers (Institute of Occupational Medicine [IOM]) and midget impingers for the collection of total isocyanates in air using the 1-(9-anthracenylmethyl)piperazine (MAP) reagent are presented. Air sampling and analysis was performed according to the National Institute for Occupational Safety and Health MAP draft method 5525. Midget impingers filled with 15 mL of 1 x 10(-4) M MAP in butyl benzoate were operated at 1 L/min. IOM cassettes loaded with 25-mm quartz fiber filters impregnated with 500 microg MAP, were operated at 2 L/min. Filters were field extracted with 10 mL of 1 x 10(-4) M MAP in acetonitrile. Thirty-four impinger-IOM pairs were collected in three autobody shops during spray painting tasks. Regression analysis [Ln (IOM) = 1.0 Ln (impinger), R2 = 0.98] and a paired t-test (Pr > 0.9) demonstrated that impingers and IOMs perform equally in their collection efficiency for the monomer and total oligomeric hexamethylene diisocyanate (HDI). IOM performance did not deteriorate at longer sampling times compared with the impinger performance. Within-sampler variability was calculated from the individual coefficients of variation (CV) of the 17 pairs of like samplers. The mean of CVs (SD)% for the monomer and total oligomeric HDI was approximately 12 (12)% and 15 (13)% for the IOM and the impinger sampler, respectively. Poor correlation (Pearson correlation coefficient < 0.3) and statistically nonsignificant differences (P > 0.74 two-sided) were found for the between-sampler CVs. Factors that might have influenced the observed sampler agreement are also discussed. It is concluded that MAP impregnated filters can be successfully used for sampling of slow curing total aliphatic isocyanates in air.
Keywords
Occupational-exposure; Automotive-exhausts; In-vitro-studies; Respiratory-system-disorders; Respiratory-irritants; Sampling-equipment; Sampling-methods; Measurement-equipment
Contact
U.S. Department of Health and Human Services, Public Health Service, Centers for Disease Control and Prevention, National Institute for Occupational Safety and Health, Cincinnati, OH 45226-1998
CODEN
AIHAAP
Publication Date
20021101
Document Type
Journal Article
Email Address
Dhimiter_Bello@student.uml.edu
Fiscal Year
2003
NTIS Accession No.
NTIS Price
Issue of Publication
6
ISSN
0002-8894
NIOSH Division
DART
Priority Area
Research Tools and Approaches: Exposure Assessment Methods
Source Name
American Industrial Hygiene Association Journal
State
CT; OH; MA
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