Mechanisms of Activated Carbon Degradation by Perspiration.
Final rept. Jul 75-Jun 76,
DREXEL UNIV PHILADELPHIA PA
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These investigations covered two distinct subjects activated charcoal degradation by perspiration and decomposition of chloramine B. Both untreated and treated activated charcoal samples were exposed to synthetic sweat solutions or aqueous solutions of individual components of synthetic sweat. Change in activated charcoal capacity was measured using carbon tetrachloride pick-up measured under static conditions. Gas chromatography was also used for dynamic measurements to determine if individual components could be ranked as to their poisoning effects. Neither static or dynamic tests uncovered any material which could be positively identified as causing capacity reduction. The studies showed that poisoning effects could be reduced by pretreating the charcoal with a pH 7 buffer or by coating the charcoal with hydrophobic substances. Thermal decomposition of chloramine B was studied in two temperature ranges low ambient to 100 C and high 100 C to 185 C. In the low range, decomposition was determined to be the result of hydrolysis of the chloramine B salt. In the high range, decomposition was violent with the generation of a large amount of heat, characteristic of N-Cl compound decomposition. Author
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