This method describes the collection and analysis of airborne acids using Ion Chromatography. The method measures the total concentration of four airborne anions. The corresponding acids may be collected on a single sampler and determined simultaneously. Acids which can be collected and analyzed this way are hydrobromic acid, phosphoric acid, nitric acid, and sulfuric acid. A known volume of air is drawn through a silica gel tube. Sulfuric acid, phosphoric acid and other particulates are collected on the glass fiber plug while hydrobromic acid and nitric acid are collected on the silica gel sorbant. The glass fiber plug and the silica gel tubes are desorbed with standard eluent and analyzed by Ion Chromatography (IC).
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| Hold Times, Preservatives, Preps, Collection, Analytical & Documentation | |
|---|---|
| Holding Time: | None noted in method. |
| Preservatives: | None noted in method. |
| Required Preps: | Glass fiber filter plug; silica gel sorbant tubes 150mg/75mg. |
| Collection Method: | Glass fiber filter plug and silica gel tube: 96L @ 0.2L/min. |
| Analytical Methodology: | Ion Chromatography. |
| Documentation: | 
ID-165SG
|
| Analyte | Formula | CAS Number | Detection Limit | |
|---|---|---|---|---|
| Hydrogen bromide | HBr |
10035-10-6 |
0.2 |
µg |
| Phosphoric acid | H3PO4 |
7664-38-2 |
0.25 |
µg |
| Sulfuric acid | H2SO4 |
7664-93-9 |
0.25 |
µg |
| Nitric acid | HNO3 |
7697-37-2 |
0.125 |
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.