Evaluation of the Permea-Tec pads as new technology for the detection of chemical breakthrough in PPC.
El-Ayouby-NS; Berardinelli-SP; Hall-RC
Am J Ind Med 1999 Sep; 36(S1):128-129
The breakthrough time for each chemical was determined first. Table I indicates the breakthrough time for methanol using nitrile gloves. General purpose solvent PTP did not change color during testing. Mean breakthrough time was calculated as 54+/- minutes. Methanol spiked charcoal pads disposed in co-solvent mixtures of 2% DMSO in CS2, 1% 2-butanol in CS2, and 1 % 2-propanol in CS2. The desorption efficiency of methanol from charcoal was < 15%. Further experiments with 2-butanol yielded >90% efficiency and was used for desorption. GC analysis indicated that methanol was sorbed/desorbed from the test specimens, (Hirayama and Ikeda, 1979). The aliphatic amine pads were much more sensitive to the treatment. The pad indicator changed color before IR breakthrough occurred which indicated that the concentration at breakthrough time was below the IR minimum detection limit of 0.3ppm. The mean was 2.3 +/- 0.7 minutes. Therefore, these pads do work according to their intended application (Table II). The aromatic amine pads were sensitive to treatment of neat aniline. The indicator pad changed color with IR breakthrough time which occurred at a concentration about 7ppm. Calculated mean time with the Edmont 37-175 Nitrile gloves was 12.7 +/- 1.5 minutes (Table III).
Work-environment; Protective-clothing; Personal-protective-equipment; Gloves; Skin-exposure; Chemical-analysis; Chemical-reactions
Nadia S. El-Ayouby, National Institute for Occupational Safety and Health, Division of Safety Research, 1090 Willowdale Road, Morgantown, WV 26505
74-82-8; 121-44-8; 62-53-3
American Journal of Industrial Medicine