This method is for the collection and analysis of ammonia by visible absorption spectrophotometry. The sample is collected on a sulfuric acid-treated silica gel tube. A 0.8µm mixed cellulose ester pre-filter may be used to remove particulate interferences if necessary. After collection, the sample is extracted in 20ml of deionized water and analyzed by visible absorption spectrophotometry.
The working range of the method is 0.2 to 400 ppm (0.15 to 300 mg/m³) for a 10-L air sample. This method is based on the sampling procedure of Method S347, the automated analytical procedure of EPA Method 350.1, and Standard Methods 417G.
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| Hold Times, Preservatives, Preps, Collection, Analytical & Documentation | |
|---|---|
| Holding Time: | None specified in the method. |
| Preservatives: | None specified in the method. |
| Required Preps: | Sulfuric acid treated silica gel tube, 200mg/100mg (SKC 226-10-06) |
| Collection Method: | The method recommends a 0.1 - 0.2 L/min. flow rate with a 0.1 - 96L sample collection volume. |
| Analytical Methodology: | Visible absorption spectrophotometry |
| Documentation: | 
6015
|
| Analyte | Formula | CAS Number | Detection Limit | |
|---|---|---|---|---|
| Ammonia | NH3 |
7664-41-7 |
0.5 |
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.