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Annals of Occupational Hygiene Advance Access originally published online on April 24, 2007
Annals of Occupational Hygiene 2007 51(4):371-378; doi:10.1093/annhyg/mem011
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© The Author 2007. Published by Oxford University Press on behalf of the British Occupational Hygiene Society

Redesign of a Static Horizontal Elutriator to Perform According to the ISO 7708 Respirable Convention

TOSHIHIKO MYOJO*, TAKAKO OYABU, KAORI KURODA, CHIKARA KADOYA, KEN-ICHIRO NISHI and ISAMU TANAKA

Institute of Industrial Ecological Sciences, University of Occupational and Environmental Health, Iseigaoka 1-1, Kitakyushu 807-8555, Japan

* Author to whom correspondence should be addressed. E-mail: tmyojo{at}med.uoeh-u.ac.jp

A static horizontal elutriator (multi-channel elutriator C-30, Sibata Scientific Instruments Ltd, Tokyo) has been widely used as a dust size classifier for a low-volume air sampler in Japan. The sampler uses the historical criterion defined by the British Medical Research Council (BMRC). However, a new sampling convention based on the ISO 7708 respirable dust convention was recently introduced into the Japanese standard for work environment measurement. It is necessary to modify the multi-channel static horizontal elutriator to satisfy the ISO 7708 respirable convention. We propose a modification of the horizontal elutriator, involving the shortening of 11 of the 36 plates to meet the ISO 7708 respirable convention. The relationship between aerosol particle size and penetration for the elutriator was measured in calm air. The measured penetrations were compared with the calculated performance of the sampler and with the sampling convention for the ISO respirable dust. The calculated bias of sampled masses with respect to the ISO respirable mass was almost zero for the workplace aerosols.

Keywords: aerosol • respirable dust • sampling convention

Received September 7, 2006; in final form December 27, 2006


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