Comparison of number and respirable mass concentration determinations.
Tomb TF; Haney RA
Advances in air sampling. ACGIH Air Sampling Procedures Committee, eds. Chelsea, MI: Lewis Publishers, 1988 Jun; :189-202
An evaluation was conducted to investigate the validity of the equivalent respirable mass concentrations recommended by safety organizations. A brief review was presented of the rationale published in the 1976 and subsequent Threshold Limit Value Handbooks and other sources. Empirical relationships were derived from comparative measurements obtained with a long running midget impinger and a respirable dust sampler. It was concluded that the general relationship of 6mppcf equalling 1mg/m3 used to convert particle count concentration data to respirable mass concentration data was not valid. This conclusion was based on the fact that equivalent mass concentrations established from the empirical relationships derived from comparative impinger and respirable samples did not always agree with those recommended in the Threshold Limit Value Handbook. The rationale supporting the 6mppcf equivalent to 1mg/m3 relationship was determined to be questionable and could not be confirmed using data collected during this evaluation. Since there was a significant difference in the empirical relationships derived between count and respirable mass concentration, determinations and attempts to mathematically calculate equivalent mass concentrations were not successful. The authors conclude that equivalent respirable mass concentration limits should be empirically derived using comparative measurements obtained in the aerosol of interest.
We take your privacy seriously. You can review and change the way we collect information below.
These cookies allow us to count visits and traffic sources so we can measure and improve the performance of our site. They help us to know which pages are the most and least popular and see how visitors move around the site. All information these cookies collect is aggregated and therefore anonymous. If you do not allow these cookies we will not know when you have visited our site, and will not be able to monitor its performance.
Cookies used to make website functionality more relevant to you. These cookies perform functions like remembering presentation options or choices and, in some cases, delivery of web content that based on self-identified area of interests.
Cookies used to track the effectiveness of CDC public health campaigns through clickthrough data.
Cookies used to enable you to share pages and content that you find interesting on CDC.gov through third party social networking and other websites. These cookies may also be used for advertising purposes by these third parties.