Analysis of air for tertiary amine catalysts used in the polyurethane foam industry.
Foley-GD; Tucker-SP; Cooper-CV
Am Ind Hyg Assoc J 1991 Dec; 52(12):A664-A665
A study was conducted to develop a sampling and analytical method for four tertiary amine catalysts in air to enable NIOSH investigators to perform an industrial hygiene study at a polyurethane (9009545) foam manufacturing facility. Thermosorb/A sampling cartridges were evaluated for use as solid sorbent samplers in this method. The catalysts included N-ethylmorpholine (76584), triethylenediamine (280579), bis(2-)dimethylamino)ethyl)-ether (3033623), and N-cocomorpholine. Average recoveries of the four compounds from Thermosorb/A tubes were satisfactory, at least 72%, for the respective loadings. These recoveries were determined after the samples had been stored in the Thermosorb/A tubes for 2 days at room temperature. They were found to be stable on Thermosorb/A tubes during storage for 21 days at room temperature. The relative standard deviation for recovery of 24 micrograms of bis(2- (dimethylamino)ethyl)ether after 21 days of storage was 14%. The limit of detection of each of the four amine catalysts in solution was in the range of 0.7 to 1.3 micrograms/milliliter. In breakthrough tests where front and backup Thermosorb/A tubes in series were employed, each front tube collected greater than 95% of the total quantity collected by two tubes. Test concentrations were 232 to 25mg/m3 at a flow rate of 0.1 liters/minute and a relative humidity of 75% in each case.
NIOSH-Author; Analytical-methods; Amines; Chemical-analysis; Air-quality-monitoring; Air-sampling-techniques; Air-sampling-equipment; Polyurethane-foams
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American Industrial Hygiene Association Journal