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CISDOC database

Document ID (ISN)32307
CIS number 79-1916
ISSN - Serial title 0509-6510 - Prace Centralnego instytutu ochrony pracy
Year 1979
Convention or series no.
Author(s) Kryńska A., Pośniak M.
Title Method for determining tolylene diisocyanate in air
Original title Metoda oznaczania toluilenodwuizocyjanianu w powietrzu [in Polish]
Bibliographic information 1979, Vol.29, No.100, p.35-43. 20 ref.
Abstract A review of the industrial uses and toxicity of 2,4-tolylene diisocyanate (TDI) and various methods for its determination in air is followed by a description of a colorimetric method by which 0.06mg TDI can be determined in 1m3 air. The TDI is converted into diamine by hydrolysis; the diamine is caused to react with sodium carbonate, and then with salt R, used as a passive component in the coupling reaction which produces an azo dye. Maximum absorption of the compound thus obtained occurs at 490nm wavelength, and the variation coefficient is within ▒6%. Salt R effectively replaces N-(1-naphtlyl)ethylenediamine which is difficult to obtain; thus the sensitivity and accuracy of this method are comparable with those of Marcali's method.
Descriptors (primary) tolylene diisocyanate; colorimetry; determination in air
Descriptors (secondary) description of technique; 2,4-tolylene diisocyanate
Document type -
Subject(s) Toxic and dangerous substances
Broad subject area(s)
Browse category(ies) Isocyanates
Cyano compounds