A diffusive sampler for personal monitoring of toluene diisocyanate (TDI) exposure; Part II: Laboratory and field evaluation of the dosimeter.
A passive monitor for TDI which utilizes microporous Teflon diffusion membranes and a 0.5% sulfuric acid (H2SO4) absorbing medium was evaluated. The collection rate of TDI is proportional to exposure dose from 10 to at least 300 ppb.hr, and response is equivalent for 2,4- and 2,6-TDI. Collection rate is independent of humidity and normal atmospheric pressure variations, while temperature causes a decrease of 1.0% per degree centigrade. Negative interference caused by ambient nitrogen dioxide (NO2) is eliminated by addition of sulfamic acid (HSO3 NH2) to the collecting medium. N-ethylmorpholine is a positive interferent. Field testing of the sampler against a reference impinger technique indicated a positive bias when TDI is aerosolized.
Rando
R J
RJ
Tulane University School of Medicine, Pulmonary Diseases Section, New Orleans, LA 70112.
Hammad
Y Y
YY
Chang
S N
SN
D000395:Air Pollutants, Occupational / Q000032:analysis*; D001274:Atmospheric Pressure; D002138:Calibration; D003485:Cyanates / Q000032:analysis*; D004784:Environmental Monitoring / Q000295:instrumentation*; D004867:Equipment Design; D005069:Evaluation Studies as Topic; D006813:Humidity; D006868:Hydrolysis; D009025:Morpholines / Q000032:analysis; D009585:Nitrogen Dioxide / Q000032:analysis; D013696:Temperature; D014051:Toluene 2,4-Diisocyanate / Q000032:analysis*
D000395:Air Pollutants, Occupational; D003485:Cyanates; D009025:Morpholines; D014051:Toluene 2,4-Diisocyanate; C058866:N-ethylmorpholine; D009585:Nitrogen Dioxide