This method is for the determination of gaseous hydrochloric and hydrofluoric acids and other gaseous chlorides and fluorides that pass through a particulate matter filter maintained at 177°C. The method is specific for sampling combustion effluent from mineral calcining industries.
Thsample is collected using a US-EPA Method 26 type sampling train. The filter is typically Teflon in a mat configuration. If the source temperature is above 210°C (410°F), a quartz filter can be used because the Teflon will begin to degrade at that temperature. The cyclone is optional and required if the stack gas is saturated with moisture, otherwise, the use is optional. A knockout impinger (for moisture) may be used which is placed prior to the series of impingers and filled with 50mL of 0.1N H2SO4. The 1st and 2nd impingers are filled with 100mL of 0.1N H2SO4. The 3rd and 4th impingers are filled with 100mL of 0.1N NaOH. A final impinger or drying tube contains contains 200-300g silica gel.
Each fraction (H2SO4 and NaOH) is analyzed by ion chromatography (IC) and each is analyzed in duplicate.
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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: | Teflon or quartz filters |
| Collection Method: | US-EPA modified Method 5 sampling train |
| Analytical Methodology: | IC |
| Documentation: | 
D-6735
|
| Analyte | Formula | CAS Number | Detection Limit | |
|---|---|---|---|---|
| Hydrogen chloride | HCl |
7647-01-0 |
0.1 |
ppm |
| Hydrogen fluoride | HF |
7664-39-3 |
0.1 |
ppm |
| Chlorine | Cl2 |
7782-50-5 |
0.1 |
ppm |
* 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.