This method describes the collection of airborne elemental mercury in a passive dosimeter or active sampling device and subsequent analysis using a cold vapor-atomic absorption spectrophotometer (CV-AAS). A passive or an active sampling device are available. Both devices use Hydrar or hopcalite as the solid sorbent. The sorbent is digested using nitric acid and hydrocloric acid. The mercury in the sample is reduced to elemental mercury using stannous chloride and analyzed using a cold vapor-atomic absorption spectrophotometer.
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| Hold Times, Preservatives, Preps, Collection, Analytical & Documentation | |
|---|---|
| Holding Time: | The collected mercury sample is stable for at least 30 days. |
| Preservatives: | None noted in method. |
| Required Preps: | Gas monitoring dosimeter badge and pouch containing a Hydrar capsule (800mg sorbent) or Hydrar or hopcalite sampling tubes; 7cm x 6mmOD glass tubes which contain 200 mg of sorbent. |
| Collection Method: | Hopcalite sampling tubes/badge: 3L -100L @ 0.2L/min (Active sampler); 9.6L @ 0.02L/min (Passive sampler). |
| Analytical Methodology: | CV-AAS |
| Documentation: | 
ID-140
|
| Analyte | Formula | CAS Number | Detection Limit | |
|---|---|---|---|---|
| Mercury | Hg |
7439-97-6 |
0.02 |
µg |
* 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.