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D5320-96 – Standard Test Method Technical Guide
ASTM D5320-96 (Reapproved 2000) is an American National Standard for the determination of 1,1,1-trichloroethane and methylene chloride content in stabilized trichloroethylene and tetrachloroethylene. These test methods are essential for quality assurance in solvent production and reclamation, ensuring purity levels are maintained.
📐 Test Methods and Scope
The standard covers two primary test methods:
- Test Method A: Capillary column gas chromatographic determination using a flame ionization detector (FID).
- Test Method B: Packed column gas chromatographic determination using a thermal conductivity detector (TCD).
Both methods are designed for virgin or reclaimed solvents and can be extended to other resolvable components, such as stabilizers, with appropriate calibration. The standard does not address all safety concerns, and users should apply proper safety and health practices.
⚙️ Apparatus and Column Specifications
The gas chromatograph must be temperature programmable and equipped with a chart recorder or electronic integrator. Additional equipment includes a 10 µL syringe, assorted microsyringes, and 100 mL volumetric flasks for standard preparation. Column specifications are critical for accurate separation as detailed below:
| 🟦 Component | 📏 Test Method A | 📐 Test Method B |
|---|---|---|
| Column Type | 30-m by 0.53-mm ID fused silica capillary | 10-ft by 1/8-in. OD stainless steel packed |
| Stationary Phase | Cross-linked polymethyl silicone, 3-µm thickness | 3% SP1500 on 80/100 mesh Carbopack B |
| Detector | Flame ionization detector (FID) | Thermal conductivity detector (TCD) |
| Injection Port | Capillary split/splitless | Packed column injection port |
Note: While the standard specifies these combinations, Note 1 indicates that it should be possible to perform the analysis with either column and detector combination.
📊 Calibration and Analysis Procedure
Samples of trichloroethylene or tetrachloroethylene are introduced into the GC. Calibration mixtures containing known concentrations of methylene chloride, 1,1,1-trichloroethane, or other impurities are used. The amount of impurities is calculated by comparing peak areas from sample chromatograms with those from calibration standards. Instrumental parameters are provided for both capillary and packed columns.
Tip: Use an electronic integrator for more accurate peak area measurement, as preferred in the standard.
The methods allow for flexibility in the choice of column and detector, ensuring adaptability to various laboratory setups.
❓ Frequently Asked Questions
🔍 What is the scope of ASTM D5320-96?
The standard provides test methods for determining low levels of 1,1,1-trichloroethane and methylene chloride in virgin or reclaimed trichloroethylene and tetrachloroethylene.
💡 How are interferences addressed?
Interferences from co-eluting compounds can affect accuracy. Proper column selection and calibration with known concentrations are recommended to resolve these issues.
⚡ What detectors are required for each method?
Test Method A requires a flame ionization detector (FID), while Test Method B requires a thermal conductivity detector (TCD). Both are essential for their respective methods.
📌 Can other components be analyzed using these methods?
Yes, these test methods can be used to determine impurity levels of other components, such as stabilizers, provided they are resolved by the recommended GC columns and