Evaluation of a coated-filter sampling method for the determination of isocyanate concentrations in air
An alternative sampling device was evaluated for the determination of isocyanates in air. Diphenylmethane and 1-(2-methoxyphenyl)piperazine were used to coat a glass-fiber filter. The piperazine reacted with aromatic and aliphatic isocyanates, forming ureas. High-pressure liquid chromatography was used to analyze these ureas with electrochemical detection. The mixing of the isocyanate aerosol with the reagent was facilitated by the diphenylmethane. When compared with the results obtained using a reference impinger method in laboratory sampling, the isocyanate air concentrations recorded from the coated-filter method were higher. When tested in the field, air concentrations determined from the impinger samplers for more than 50% of the sample pairs were higher than those obtained by the filter-sample method. The author concludes that this coated-filter method was not reliable enough to be used for determining isocyanate aerosol concentrations in the atmosphere of a work environment.
- Research Organization:
- National Inst. for Occupational Safety and Health, Cincinnati, OH (USA). Div. of Physical Sciences and Engineering
- OSTI ID:
- 6028289
- Report Number(s):
- PB-87-205001/XAB; TRN: 87-033909
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
37 INORGANIC
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
99 GENERAL AND MISCELLANEOUS//MATHEMATICS, COMPUTING, AND INFORMATION SCIENCE
AIR FILTERS
COATINGS
AIR POLLUTION
ISOCYANATES
CHEMICAL ANALYSIS
OCCUPATIONAL SAFETY
AEROSOLS
FILTRATION
PIPERAZINES
SAMPLING
AZINES
COLLOIDS
DISPERSIONS
EQUIPMENT
FILTERS
HETEROCYCLIC COMPOUNDS
ORGANIC COMPOUNDS
ORGANIC NITROGEN COMPOUNDS
POLLUTION
POLLUTION CONTROL EQUIPMENT
PYRAZINES
SAFETY
SEPARATION PROCESSES
SOLS
500200* - Environment
Atmospheric- Chemicals Monitoring & Transport- (-1989)
400102 - Chemical & Spectral Procedures
552000 - Public Health