Accession Number:

AD0262492

Title:

SUMMARY OF DEVELOPMENT AND STANDARDIZATION STUDIES ON THE SHIPE SAMPLER

Descriptive Note:

Corporate Author:

ARMY BIOLOGICAL LABS FREDERICK MD

Personal Author(s):

Report Date:

1956-04-01

Pagination or Media Count:

1.0

Abstract:

Comparisons were made with the Shipe Sampler and various types of other impingers and bubblers. Both Serratia marcescens and Bacillus globigii were employed as test materials and a wide variety of disseminating devices were employed. In general, the results indicated that aerosol recoveries were higher with the Shipe Sampler than with the all-glass impinger with vegetative cells, and that the difference between the two samplers was less with smaller mass median diameter aerosols. Studies were carried out to determine the number of bacteria escaping from samplers. It was found that 0.30 or - 0.06 percent and 3.8 or - 0.2 percent of the total collection slipped by the all-glass impinger and the Shipe Sampler, respectively. Attention was given to the differences in particle-size selectivity resulting from particulate retention in those samplers having curved intake tubes. Studies indicate that, with heterogeneous aerosols of a large mass median diameter, the lack of particle-size discrimination with the Shipe Sampler results in higher recoveries. Data indicate the destructive effect of the tangential jet Shipe Sampler tube somewhat less than that with the high-speed, direct-impingement samplers. Author

Subject Categories:

Distribution Statement:

APPROVED FOR PUBLIC RELEASE