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D5307-97 – Standard Test Method Technical Guide
📜 Scope and Summary of ASTM D5307-97
This standard test method, officially designated D5307-97 (Reapproved 2007), is an American National Standard for the determination of the boiling range distribution of water-free crude petroleum. The method covers the boiling range through 538°C (1000°F). Material boiling above this temperature is collectively reported as residue. It is specifically applicable to whole crude samples that can be solubilized in a suitable solvent, such as carbon disulfide, for injection via a microsyringe.
The core principle involves diluting the crude oil sample with carbon disulfide and injecting it into a gas chromatographic column that separates hydrocarbons strictly in boiling point order. The column temperature is raised at a reproducible, linear rate, and the detector signal is integrated continuously to generate a boiling point distribution profile.
⚠️ Critical Safety Note: Carbon disulfide (CS₂) is highly toxic and flammable. Users must strictly follow the specific safety precautions outlined in sections 7.2, 7.5, 7.6, 7.7, and 7.9 of the standard. Always handle the solvent and crude mixtures in a properly ventilated fume hood.
⚙️ Key Terminology and Test Procedure
Accurate application of this standard requires strict adherence to its specific terminology. The detector signal is integrated using area slice mode, capturing consecutive, fixed-duration time intervals rather than individual peaks. A corrected area slice is obtained by subtracting a blank analysis to compensate for baseline drift. Boiling points are assigned to the retention time axis via a calibration curve generated by analyzing a mixture of n-paraffins of known boiling point under identical conditions spanning the full range up to 538°C (1000°F).
The Initial Boiling Point (IBP) is defined as the temperature at which the cumulative corrected area reaches exactly 0.5% of the theoretical total area. To accurately determine the residue, a second analysis of the crude oil is performed with an added internal standard, allowing for calculation of the theoretical total area (T) and compensation for non-eluted high-boiling components.
💡 Procedure Tip: For valid results, the chromatographic conditions (column, temperature ramp, carrier gas flow) must be absolutely identical for the sample analysis, the blank run, and the n-paraffin calibration standard run. This ensures accurate boiling point assignment across the entire range.
📊 Key Measured Properties and Calibration Standards
The following tables summarize the essential definitions outlined in Section 3 of the standard and provide examples of the typical calibration compounds used to construct the retention time versus boiling point curve.
| 🟦 Term | 📐 Definition / Symbol | 🎯 Key Value / Note |
|---|---|---|
| Initial Boiling Point (IBP) | Temp at 0.5% cumulative corrected area | Defines the start of the boiling curve |
| Residue (RES) | Sample boiling above 538°C (1000°F) | Determined via internal standard method |
| Theoretical Total Area (T) | Area if entire sample had eluted | Calculated from internal standard data |
| Area Slice | Integrated detector signal in fixed time interval | Bypasses peak detection parameters |
| Corrected Area Slice | Slice corrected for baseline drift | Blank subtraction required for accuracy |
| ⚡ Calibrant | 📏 Boiling Point (°C) | 📏 Boiling Point (°F) |
|---|---|---|
| n-Pentane (n-C₅) | 36 | 97 |
| n-Decane (n-C₁₀) | 174 | 345 |
| n-Hexadecane (n-C₁₆) | 287 | 549 |
| n-Tetracontane (n-C₄₀) | 525 | 977 |
* Calibration standards must span the full range up to 538°C (1000°F) as required by Section 4.1 of the method.
❓ Frequently Asked Questions
🔍 What is the maximum boiling point covered by ASTM D5307?
© 2026 TNLab — This article is a technical interpretation for reference only. The original standard as published by ASTM International takes precedence.