This method is used for the determination of formaldehyde and other carbonyl compounds (aldehydes and ketones) in ambient air. The samples are collected on a DNPH (2,4-dinitrophneylhydrazine) coated silica gel cartridge and analyzed by high performance liquid chromatography (HPLC).
A known volume of ambient air is drawn through the cartridge. The method can be used for a time-weighted average (TWA) or for long therm sampling of 1-24 hours if the concentration of the analytes is in the low ppb range. The sampling system consists of a heated inlet (~50°C) coupled to an ozone denuder or scrubber to minimize water and ozone interferences.
After sampling the samples are extracted with acetonitrile and analyzed by HPLC.
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| Hold Times, Preservatives, Preps, Collection, Analytical & Documentation | |
|---|---|
| Holding Time: | 2 weeks from sampling to analysis. |
| Preservatives: | Refrigerate samples at 4°C. |
| Required Preps: | DNPH coated silica gel tubes (Supelco, SKC, AAC Inc.). Cartridges will maintain their integrity for up to 90 days if stored at 4°C. |
| Collection Method: | DNPH cartidge following TO-11A |
| Analytical Methodology: | HPLC by TO-11A |
| Documentation: | 
TO-11A
|
| Analyte | Formula | CAS Number | Detection Limit | |
|---|---|---|---|---|
| Benzaldehyde | C7H6O |
100-52-7 |
0.05 |
µg |
| p-Tolualdehyde | C8H8O |
104-87-0 |
0.05 |
µg |
| Acrolein | C3H4O |
107-02-8 |
0.05 |
µg |
| Valeraldehyde (Pentanal) | C5H10O |
110-62-3 |
0.05 |
µg |
| Propionaldehyde (Propanal) | C3H6O |
123-38-6 |
0.05 |
µg |
| Butyraldehyde (Butanal) | C4H8O |
123-72-8 |
0.05 |
µg |
| Crotonaldehyde | C4H6O |
4170-30-3 |
0.05 |
µg |
| Formaldehyde | CH2O |
50-00-0 |
0.05 |
µg |
| o-Tolualdehyde | C8H8O |
529-20-4 |
0.05 |
µg |
| 2,5-Dimethylbenzaldehyde | C9H10O |
5779-94-2 |
0.05 |
µg |
| Isovaleraldehyde | C5H10O |
590-86-3 |
0.05 |
µg |
| m-Tolualdehyde | C8H8O |
620-23-5 |
0.05 |
µg |
| Hexaldehyde (hexanal) | C6H12O |
66-25-1 |
0.05 |
µg |
| Acetone | C3H6O |
67-64-1 |
0.05 |
µg |
| Acetaldehyde | C2H4O |
75-07-0 |
0.05 |
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.