This method is for the determination of dimethylamine (DMA). The sample is collected on an XAD-7 tube coated with 10% NBD chloride by weight. After collection the sample is The sample is desorbed with tetrahydrofuran (with a small amount of sodium bicarbonate present) and analyzed by high-performance liquid chromatography (HPLC) using a fluorescence or visible detector.
The advantage of this method is that DMA is analyzed as a deriviative which is specific, stable, and easier to quantitate than the free amine.
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| Hold Times, Preservatives, Preps, Collection, Analytical & Documentation | |
|---|---|
| Holding Time: | Recoveries of DMA remained above 92% after 15 days of storage at 0°C and 25°C. |
| Preservatives: | Keep samples refrigerated or at ambient temperature. |
| Required Preps: | XAD-7 tube coated with 10% NBD chloride by weight, 80mg/40mg (SKC 226-96) |
| Collection Method: | The method recommends a 0.2 L/min. flow rate with a 10L sample collection volume. |
| Analytical Methodology: | HPLC/fluorescence or visible detection |
| Documentation: | 
034
|
| Analyte | Formula | CAS Number | Detection Limit | |
|---|---|---|---|---|
| Dimethylamine | C2H7N |
124-40-3 |
0.43 |
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.