Investigation of Approaches for the Determination of Inorganic Chloramines in Workplace Air.
NIOSH 1993 Apr:50 pages
Direct reading instrument methods for determining the concentration of inorganic chloramines in the air at work sites were investigated. Infrared spectrometry allowed the detection of gaseous nitrogen- trichloride (10025851) in atmospheres low in carbon-dioxide. Under comparable conditions it was not possible to identify either monochloramine (10599903) or dichloramine (51752). Under atmospheric levels of carbon-dioxide, the nitrogen-trichloride absorbance band was completely obscured by carbon-dioxide sidebands. Although detector tubes for chlorine reacted with nitrogen-trichloride, the presence of trace amounts of molecular chlorine interfered, making the use of detector tubes unworkable. Mass spectrometry with selected ion monitoring detected nitrogen-trichloride. Nitrogen- trichloride was stable in a glass/polytetrafluoroethylene sample bulb for over 48 hours. There were problems with the introduction of nitrogen-trichloride into the instrument. The presence of amines did not seriously affect the mass spectral intensities of nitrogen- trichloride. Even after a 4 hour period the introduction of primary amines did not appreciably change the mass spectral intensity. The author concludes that mass spectrometry appears to be the technique to use for the analysis of nitrogen-trichloride. A more easily managed method for sample introduction to the system was needed.
NIOSH-Author; Nitrogen-compounds; Chlorides; Analytical-methods; Chemical-analysis; Analytical-chemistry; Air-quality-monitoring; Amines;
10025-85-1; 10599-90-3; 51-75-2;
NTIS Accession No.
Division of Physical Sciences and Engineering, NIOSH, U.S. Department of Health and Human Services, Cincinnati, Ohio, 50 pages, 55 references