Method 71

o-Dianisidine, 4,4'- Methylenebis(2-chloroaniline) (MOCA), and o-Tolidine by GC/ECD

This method describes the sample collection and analysis of o-Dianisidine, 4,4'- Methylenebis(2-chloroaniline) (MOCA), and o-Tolidine. 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. The sample filters are transferred to separate glass vials containing 2 mL of deionized water within 10 h after sampling. Quantitation is performed by analyzing the heptafluorobutyric acid anhydride derivatives of the amines by gas chromatography using an electron capture detector. Samples for o-dianisidine must be shipped and stored at 0°C or colder to minimize loss of analyte. These samples should be analyzed as soon as possible.



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Method Data

Hold Times, Preservatives, Preps, Collection, Analytical & Documentation
Holding Time:   At least 15 days except samples for o-dianisidine must be analyzed as soon as possible.
Preservatives:   Store at room temperature, except samples for o-dianisidine must be shipped and stored at 0°C or colder to minimize loss of analyte
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 filter: 100 L at 1 L/min.
Analytical Methodology:   GC/ECD.
Documentation:   071

Analyte List*

Analyte Formula CAS Number Detection Limit

* 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.