Method 7600

Hexavalent Chromium

This method is used for the collection and analysis of hexavalent chromium.  The sample is collected on a 5 micron polyvinyl chloride membrane (PVC) filter.  After collection, the filter is extraction with 0.5N H2SO4 (sulfuric acid) or 2% NaOH (sodium hydroxide) - 3%Na2CO3 (sodium bicarbonate) and analyzed by visible absorption spectrophotometry.

The working range of the method is 0.001 to 5 mg/m³ for a 200L air sample.  Iron, copper, nickel, and vanadium my cause interferences with the analysis.

NOTE: This method combines and replaces P&CAM 169, S317, and P&CAM 319.  The chromium (VI) criteria document contains a method similar to P&CAM 169.

(NIOSH Issue 2: 15 August 1994)


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Method Data

Hold Times, Preservatives, Preps, Collection, Analytical & Documentation
Holding Time:   Analyze samples within 2 weeks from collection.
Preservatives:   None specified in the method.
Required Preps:   5 micron PVC filter (SKC 225-806)
Collection Method:   The method recommends a 1 - 4 L/min. flow rate and a 8 - 400L sample collection volume.
Analytical Methodology:   Visible Absorption Spectrophotometry
Documentation:   7600

Analyte List*

Analyte Formula CAS Number Detection Limit
Hexavalent chromium

* 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.