Poroplastic-Bound Liquids as Potential Substitutes for Free Liquid in Impingers.
NIOSH 1979:14 pages
The collection of nitric-acid (7697372) in sorbent tubes packed with poroplastic bound liquids was assessed. Loss of solvent was determined by the exchange of liquid for the sampling solution by means of weight loss versus time of the films with distilled water and with a solution of distilled water and 5 percent glycerol. Capacity, breakthrough, and recovery of nitric-acid was determined in poroplastic beads loaded with distilled water. The influence of bead quantity and concentration on breakthrough volumes and capacities was determined. Absorption efficiency and recovery of nitric-acid was measured. The results of the Poroplastic testing were compared with results using the impinger method. Breakthrough volumes were high enough with Poroplastic to allow nitric-acid to be collected for analysis and were independent of the concentration sampled. Weight change studies indicated a significant loss of water. Water loss from beads and film was approximately equal. In measures of absorption efficiency and recovery, there was no detectable breakthrough, and recoveries were greater than 90 percent. The author concludes that the Poroplastic approach is promising for nitric-acid collection and may be useful in replacing impinger methods.
NIOSH-Author; Solvents; Impingers; Samplers; Acids; Analytical-methods; Chemical-properties; Absorption-rates;
NTIS Accession No.
NIOSH, Public Health Service, U.S. Department of Health, Education, and Welfare, Cincinnati, Ohio, NTIS PB83-245-886, 14 pages, 5 references