This method is for the sampling and analysis of formaldehyde from natural gas-fired stationary source emisssions. The sample is collected using a midget impinger train using chilled deoionized water in the impingers.
The sampling train consists of a quartz glass or stainless steel probe and three midget impingers. The first impinger is the moisture knockout impinger, the second impinger contains 20mL of deionized water and the third impinger contains silica gel to remove moisture prior to the dry gas meter. After collection the impinger catch is transferred to an amber 40mL VOA bottle. Deioninzed water is used to rinse the impinger and connecting glassware and the rinse is added to the impinger contents. The sample bottle should be filled to the top with no headspace with additional water. Keep the samples on ice after collection and during shipment to the lab for analysis.
An aliquot o f the sample is derivitized and measured using a spectrophotometer.
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| Hold Times, Preservatives, Preps, Collection, Analytical & Documentation | |
|---|---|
| Holding Time: | None specified in the method, however, the method says to analyze samples as soon as possible. |
| Preservatives: | Keep samples cold after collection and during shipment to the lab. |
| Required Preps: | 40mL Amber VOA bottle with Teflon-lined lid. |
| Collection Method: | Midget impinger train |
| Analytical Methodology: | Colormetric |
| Documentation: | 
323
|
| Analyte | Formula | CAS Number | Detection Limit | |
|---|---|---|---|---|
| Formaldehyde | CH2O |
50-00-0 |
0.2 |
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.