This method is used for the determination of inorganic acids. The sample is collected on silica gel tube, desorbed with a bicarbonate/carbonate buffer solution, and then analyzed by ion chromatograph (IC). This method measures total concentration of six airborne anions which can be collected on a single tube and determined simultaneously.
The working range of the method is about 0.01 to 5 mg/m³ for a 50 L air sample.
Known method interferences include the particulate salts of the acids which give a positive interference. Chlorine or hypochlorite ions interfere with the chloride determination and bromine interferes with bromide. Silica gel will collect about 30% of the free Cl2 and Br2 in an atmosphere.
NOTE: This is P&CAM 339 in a revised format. Alternate methods are M7902 for fluoride and P&CAM 268 for sulfate.
No Obligation Quotation for Analytical Services
If you would like us to provide a quote for laboratory analysis, just provide us with as much information as you can about your project (the more, the better) and we'll provide you a quote via email. As you are searching or browsing our Analytical Guide, you'll see the Request-A-Quote icon... just click on it to start the request process.
| Hold Times, Preservatives, Preps, Collection, Analytical & Documentation | |
|---|---|
| Holding Time: | The method says the samples are stable at least 21 days if kept at 25°C. |
| Preservatives: | Store samples at 25°C. |
| Required Preps: | Washed silica gel tube, 400mg/200mg with a glass fiber filter plug (SKC 226-10-03). |
| Collection Method: | The method recommends a flow rate of 0.2 to 0.5 L/min. with a collection volume of 3L - 100L. |
| Analytical Methodology: | IC |
| Documentation: | 
7903
|
| Analyte | Formula | CAS Number | Detection Limit | |
|---|---|---|---|---|
| Hydrogen bromide | HBr |
10035-10-6 |
0.9 |
µg |
| Hydrogen chloride | HCl |
7647-01-0 |
0.6 |
µg |
| Phosphoric acid | H3PO4 |
7664-38-2 |
2 |
µg |
| Hydrogen fluoride | HF |
7664-39-3 |
0.7 |
µg |
| Sulfuric acid | H2SO4 |
7664-93-9 |
0.9 |
µg |
| Nitric acid | HNO3 |
7697-37-2 |
0.7 |
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.