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Standard Practice for Enumeration of Mycobacteria in Metalworking Fluids by Direct Microscopic Counting (DMC) Method
STANDARD published on 1.7.2013
Designation standards: ASTM E2564-13
Note: WITHDRAWN
Publication date standards: 1.7.2013
SKU: NS-45615
The number of pages: 4
Approximate weight : 12 g (0.03 lbs)
Country: American technical standard
Category: Technical standards ASTM
Other standards related to microbiologyLubricants, industrial oils and related products
Keywords:
acid-fast Bacteria (AFB), acid-fast staining, direct microscopic count (DMC), hypersensitivity pneumonitis (HP) , metalworking fluid (MWF), microscopic factor (MF), non-tuberculous mycobacterium (NTM), ICS Number Code 07.100.99 (Other standards related to microbiology), 75.100 (Lubricants, industrial oils and related products)
Significance and Use | ||
5.1 During the past decade, it has become increasingly apparent that non-tuberculous mycobacteria are common members of the indigenous MWF bacterial population. Measurement of mycobacterial cell count densities is an important step in establishing a possible relationship between mycobacteria and occupational health related allergic responses, for example, Hypersensitivity Pneumonitis (HP) in persons exposed to aerosols of metalworking fluids. It is known that the viable mycobacteria count underestimates the total mycobacterial levels by not counting the non-culturable, possibly dead or moribund population that is potentially equally important in the investigation of occupational health related problems. The Direct Microscopic Counting Method (DMC) described here gives a quantitative assessment of the total numbers of acid-fast bacilli. It involves using acid-fast staining to selectively identify mycobacteria from other bacteria, followed by enumeration or direct microscopic counting of a known volume over a known area. Although other microbes—particularly the Actinomycetes—also stain acid fast, they are differentiated from the mycobacteria because of their morphology and size. Non-mycobacteria, acid-fast microbes are 50 to 100 times larger than mycobacteria. The practice provides quantitative information on the total (culturable and non-culturable viable, and non-viable) mycobacteria populations. The results are expressed quantitatively as mycobacteria per mL of metalworking fluid sample. 5.2 The DMC method using the acid-fast staining technique is a semi- quantitative method with a relatively fast turnaround time. 5.3 The DMC method can also be employed in field survey studies to characterize the changes in total mycobacteria densities of metalworking fluid systems over a long period of time. 5.4 The sensitivity detection limit of the DMC method depends on the MF and the sample volume (direct or centrifuged, etc.) examined. |
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1. Scope | ||
1.1 This practice describes a direct microscopic counting method (DMC) for the enumeration of the acid fast stained mycobacteria population in metalworking fluids. It can be used to detect levels of total mycobacteria population, including culturable as well as non-culturable (possibly dead or moribund ) bacterial cells. This practice is recommended for all water-based metalworking fluids. 1.2 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use. For additional safety information, see Laboratory Safety: Principle and Practices, 4th Edition2 |
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2. Referenced Documents | ||
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1.12.2011
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15.2.2011
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1.8.2011
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1.10.2013
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15.11.2012
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15.11.2012
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