Document 7MgZdRmzoXgGQze9mZz1xQNQ6

DOW CHEMICAL U.S.A. FYX June 19, 1979 MIDLAND, MICHIGAN 43540 c$ I 3" 3 /as^vs" T. Falkowski, Emulsion Saran, 564 Building J. Dryzga, Suspension Saran, 564 Building G. Wirsing, Saran Section, 1464-T cc: L. G. Silverstein, Industrial Hygiene Laboratory, 1803 Building R. D. Olson, Industrial Hygiene Services, 607 Building W. L. Clark, Suspension Saran, 564 Building J. Petricek, Saran F-Resins, 564 Building L. D. Wiersma, Saran Latex, 262 Building PASSIVE DOSIMETERS FOR VINYL CHLORIDE AND VINYLIDENE CHLORIDE On May 15, 1979, an experiment was conducted to determine the field response of two types of passive dosimeter, the Abcor Gasbadge and the 3M organic vapor monitor, to vinyl chloride and vinylidene chloride. The passive dosimeters were compared to simultaneous carbon tube samples. The results are shown in Table 1. The passive dosimeters were analyzed at the 1803 Building Industrial Hygiene Laboratory, while the carbon tubes were analyzed at the 564 Building laboratory. Because of the poor results obtained on the carbon tube spike (74% recovery on vinyl chloride, 54% on vinylidene chloride), the results of this experiment must be judged as inconclu sive. The experiment will be rerun, with the addition of the new DuPont passive dosimeter as one of the units tested. An analysis of carbon tube spike data for the first quarter of 1979 shows that an occasional point was far below the expected values for vinyl chloride and vinylidene chloride. No significant error was noted in the positive direction, that is, no samples showed signifi cantly higher than expected results. This would seem to indicate a loss of sample during storage, which is a reasonable possibility with vinyl chloride samples. A conversation with Dick Flaugher indicated that this problem would be investigated, with a possibility of using a refrigerator to store vinyl and vinylidene chloride samples. A series of spikes will be submitted to the 564 Building laboratory to verify the effectiveness of the new laboratory sample storage procedures. R. L. Peterson Industrial Hygiene Laboratory Health and Environmental Sciences U.S.A. 1803 Building 636-2081 jdb/Enclosure AN OPERATING UNIT OF THP DOW CHEMICAL COMPANV