Unified standard substance for the photometric determination of aromatic amines and isocyanates

Journal Article · Thu Oct 01 04:00:00 EDT 1987 · Ind. Lab. (Engl. Transl.); (United States)

OSTI ID:7166084

Belyakov, A A; Mel'nikova, L V; Kurenko, L T

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), Journal Name: Ind. Lab. (Engl. Transl.); (United States) Vol. 53:4; ISSN INDLA
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400102 -- Chemical & Spectral Procedures
500200* -- Environment
Atmospheric-- Chemicals Monitoring & Transport-- (-1989)
520200 -- Environment
Aquatic-- Chemicals Monitoring & Transport-- (-1989)
54 ENVIRONMENTAL SCIENCES
AMINES
ANILINE
AROMATICS
CALIBRATION
CALIBRATION STANDARDS
CARCINOGENS
ISOCYANATES
MATERIALS
MEASURING INSTRUMENTS
ORGANIC COMPOUNDS
PHOTOMETERS
PHOTOMETRY
RESOLUTION
SENSITIVITY
STANDARDS
TOXIC MATERIALS
TOXICITY