This method is for the determination of particulate and gaseous arsenic from stationary sources. Samples are collected isokinetically from a source on a glass fiber filter maintained at a temperature of 120 ± 14°C (248 ± 25°F). A modified Method 5 train consisting of a heated probe, heated filter, and series of impingers is used to collect the sample. The first two impingers are filled with 100mL of water, the third impinger is left empty, and the fourth impinger is filled with 200-300g of silica gel.
Once the sample has been collected, the filter is removed and placed in a petri dish. If it is necessary to fold the filter, make sure the PM is on the inside of the fold. This is container 1. Container 2 consists of the PM brushed from the probe, probe assembly and front half of the filter holder and the corresponding 0.1N NaOH rinse. The volume of the impinger contents is recorded and the silica gel is weighed to determine the moisture content of the stack gas.
At the laboratory, the filter and impinger contents are digested with HNO3 and then analyzed for arsenic. All sample fractions are typically combined for one analysis. The method recommends the use of flame atomic absorption spectrophotometry. However, most labs now substitute analysis by ICP or ICP/MS to achieve better detection limits and have less problem with interferences.
The method calls for use of an audit sample if the data are to be used for compliance. The audit sample results must be within 10% of the actual audit sample value or the samples need to be reanalyzed.
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| Hold Times, Preservatives, Preps, Collection, Analytical & Documentation | |
|---|---|
| Holding Time: | None specified in method. |
| Preservatives: | None specified in method. |
| Required Preps: | Glass fiber filter |
| Collection Method: | Modified Method 5 sampling train following Method 5 and 108 procedures. |
| Analytical Methodology: | ICP or ICP/MS |
| Documentation: | 
108
|
| Analyte | Formula | CAS Number | Detection Limit | |
|---|---|---|---|---|
| Arsenic | As |
7440-38-2 |
10 |
ug/mL |
* 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.