Unified standard substance for the photometric determination of aromatic amines and isocyanates
In the determination of aromatic amines and isocyanates in solutions, air, washings from the skin, and extracts from uniforms, the compounds themselves are used as standard substances. The necessity of laborious purification of isocyanates and amines which are carcinogenic (benzidine, 2-naphthylamine, 2,4-toluidine) or are suspected of carcinogenicity (1-naphthylamine, toluidines, toluylenediamines, nitroanilines, and others) complicates the analysis and increases the sanitation hazard. The authors have suggested that noncarcinogenic (for humans) aniline (All-Union State Standard 5819-79) be used as the unified standard substance. The reaction of condensation with p-dimethylaminobenzaldehyde in acetic acid solution is used to determine the substances. The aniline fraction boiling in the range 184-185/sup 0/C is used. The reaction with p-dimethylaminobenzaldehyde is conducted directly or after centrifugation of the sample. As a result of hydrolysis, isocyanates break down to the corresponding aromatic amines.
- Research Organization:
- Institute of Labor Hygiene and Occupational Diseases, Gor'kii (USSR)
- OSTI ID:
- 7166084
- Journal Information:
- Ind. Lab. (Engl. Transl.); (United States), Vol. 53:4; Other Information: Translated from Zavod. Lab.; 53: No. 4, 6-8(Apr 1987)
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
37 INORGANIC
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
AMINES
CALIBRATION STANDARDS
PHOTOMETRY
ANILINE
SENSITIVITY
AROMATICS
CARCINOGENS
ISOCYANATES
CALIBRATION
PHOTOMETERS
RESOLUTION
TOXIC MATERIALS
TOXICITY
MATERIALS
MEASURING INSTRUMENTS
ORGANIC COMPOUNDS
STANDARDS
500200* - Environment
Atmospheric- Chemicals Monitoring & Transport- (-1989)
520200 - Environment
Aquatic- Chemicals Monitoring & Transport- (-1989)
400102 - Chemical & Spectral Procedures