This method describes the sample collection and analysis of benzidine, 3,3'-Dichlorobenzidine (3,3'-DCB), 2,4-Toluenediamine (2,4-TDA), and 2,6-Toluenediamine (2,6-TDA). Samples are collected closed-face by drawing known volumes of air through sampling devices consisting of three-piece cassettes, each containing two sulfuric acid-treated glass fiber filters separated by a spacer. Analysis is performed by quantitating the heptafluorobutyric acid anhydride derivatives of the amines by gas chromatography using an electron capture detector. Samples for 3,3'-dichlorobenzidine must be shipped and stored under reduced temperature to help minimize loss of analyte. These samples should be analyzed as soon as possible.
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| Hold Times, Preservatives, Preps, Collection, Analytical & Documentation | |
|---|---|
| Holding Time: | At least 15 days, except 3,3'dichlorobenzidine, which must be shipped and stored under reduced temperatures and should be analyzed as soon as possible. |
| Preservatives: | Store at room temperature or keep refrigerated. |
| Required Preps: | Two sulfuric-acid treated 37-mm Gelman type A/E glass fiber filters contained in a three-piece cassette. |
| Collection Method: | Treated glass fiber filters: 100L @ 1L/min. |
| Analytical Methodology: | GC/ECD |
| Documentation: | 
065
|
| Analyte | Formula | CAS Number | Detection Limit | |
|---|---|---|---|---|
| 2,6-Toluenediamine | 823-40-5 |
5.8 |
ng | |
| 3,3'-Dichlorobenzidine | C12H10Cl2N2 |
91-94-1 |
5.6 |
ng |
| Benzidine | C12H12N2 |
92-87-5 |
4 |
ng |
| 2,4-Toluenediamine | C7H10N2 |
95-80-7 |
5.8 |
ng |
* 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.