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D3742-98 – Standard Test Method Technical Guide
📐 Summary of Test Method and Significance
The test method described in ASTM D3742-98 provides a basis for the determination of 1,1,1-trichloroethane content (in weight percent) present in either virgin or reclaimed 1,1,1-trichloroethane products, including the presence of stabilizers and impurities.
The principle of the test involves preparing gas chromatographic scans of a 1,1,1-trichloroethane standard of known high purity and the sample under test. The concentration of the unknown is calculated by direct comparison of the respective elution peak areas for 1,1,1-trichloroethane. This method provides a quantitative analysis in weight percent, although compounds that co-elute with the target analyte may interfere with the test results.
⚙️ Apparatus and Suggested Analysis Conditions
The standard requires a gas chromatograph equipped with a temperature-programmable column oven (±0.5°C), a heated injection port, a heated detector section, and a suitable detector (thermal conductivity or hydrogen flame). A 10 µL syringe is specified for sample introduction. The chromatographic column must provide adequate separation of 1,1,1-trichloroethane from stabilizers and process impurities.
| 🟦 Component | 📏 Specification |
|---|---|
| Column Tubing | 20 ft × ⅛ in. (2.4 m × 3.2 mm) OD, annealed copper or stainless steel |
| Column Packing | 80/100 mesh Chromosorb W HP coated with 20 weight % OV-101 (polydimethyl siloxane) or equivalent |
| Detector Types | Differential katharometer, thermistor TCD, or hydrogen flame detector (FID) |
| Carrier Gas | Dry helium, 99.95 mol % purity |
| Reference Standard | Unin
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