In situ sampling techniques in environmental air analysis. Final report.
University of Cincinnati, Cincinnati Ohio 1980 Jan; :1-7
Adsorbent sampling matrices specific for hydrogen-sulfide (7783064) (H2S) and acrylonitrile (107131) were assessed. Cadmium(II)/exchanged zeolite was found to be effective in adsorbing H2S in the concentration ranges necessary for personal monitoring. H2S reacted with the matrix to produce cadmium-sulfide (1306236) (CdS). Immobilized CdS was converted to methylene-blue (61734), and then determined spectrophotometrically. The detection limit was 35microg H2S could be determined. Known amounts of H2S adsorbed on the zeolite were analyzed by a variety of techniques including diffuse reflectance Fourier transform infrared, X-ray fluorescence, combustion analysis followed by non dispersive infrared, and photoacoustic spectroscopy. Photoacoustic spectroscopy yielded the greatest general potential and sensitivity. A titanium/exchanged zeolite was found to be effective for adsorbing acrylonitrile. After adsorption, the zeolite was pressed into a potassium-bromide pellet and the sample was analyzed by transmission infrared spectroscopy. Concentrations of acrylonitrile up to 50 parts per million could be determined.
NIOSH-Grant; Toxic-vapors; Analytical-methods; Quantitative-analysis; Measurement-equipment; Trace-analysis; Spectrographic-analysis; Air-quality-measurement; Safety-equipment
7783-06-4; 107-13-1; 1306-23-6; 61-73-4
Final Grant Report
NTIS Accession No.
University of Cincinnati, Cincinnati Ohio
Chemistry University of Cincinnati Department of Chemistry Cincinnati, Ohio 45221