Method 7402

Asbestos by TEM


This method is used to determine asbestos fibers in the optically visible range and is intended to complement the results obtained by phase contrast microscopy (Method 7400). The sample is collected on a filter and analyzed using transmission electron microscopy. The quantitative working range is 0.04 to 0.5 fiber/cc for a 1000-L air sample. The limit of detection (LOD) depends on sample volume and quantity of interfering dust, and is <0.01 fiber/cc for atmospheres free of interferences.


(NIOSH Issue 2: 15 August 1994)

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Method Data

Hold Times, Preservatives, Preps, Collection, Analytical & Documentation
Holding Time:   N/A
Preservatives:   Pack to reduce shock
Required Preps:   25 mm, 0.45-1.2 µm cellulose ester membrane filter
Collection Method:   Filter, 0.5-16 L/min, volume adjusted for 100-1300 fibers/mm² filter area
Analytical Methodology:   Transmission Electron Microscopy
Documentation:   7402

Analyte List*

Analyte Formula CAS Number Detection Limit
Asbestos
1332-21-4
0.01
 fiber/cc

* The analytes and detection limits listed for each method represent the typical detection limits and analytes reported for that particular method. Keep in mind that analyte lists may vary from laboratory to laboratory. Detection limits may also vary from lab to lab and are dependent upon the sample size, matrix, and any interferences that may be present in the sample.