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D6352-24 – Standard Test Method Technical Guide
📐 Scope and Applicability
ASTM D6352-24 establishes a standard test method for determining the boiling range distribution of petroleum distillate fractions using gas chromatography. Specifically, this method is designed for samples with an initial boiling point (IBP) greater than 174 °C (345 °F) and a final boiling point (FBP) less than 700 °C (1292 °F), corresponding to a carbon number range of C10 to C90 at atmospheric pressure.
It is critical to note that this test method is explicitly not applicable for the analysis of low molecular weight components such as naphthas, reformates, gasolines, or crude oils. Furthermore, materials containing heterogeneous components (e.g., alcohols, ethers, acids, or esters) or residues are outside the scope of this method. For such materials, refer to alternate standards like Test Methods D2887, D7096, or D7169.
⚠️ Material Compatibility Warning: Do not use D6352-24 to analyze samples with significant residue or polar heteroatoms. The method assumes a fully eluting sample within the calibrated boiling range.
⚙️ Method Principles and Procedure
The test method utilizes high-temperature gas chromatography (GC) to simulate a true boiling point (TBP) distillation. The sample is injected onto a non-polar capillary column which separates the hydrocarbon components by their boiling points. A Flame Ionization Detector (FID), operated in accordance with Practice E594, provides a mass-sensitive response.
Calibration is performed using a known mixture of normal paraffins spanning the boiling range of interest. The retention time of each n-paraffin is correlated to its known boiling point. The cumulative area under the chromatogram is then used to determine the boiling range distribution. Standard practices such as D4626 (Calculation of GC Response Factors) and E355 (GC Terms) are essential references for this procedure.
💡 Key Reference Standards: This method is directly linked to D2892 (for comparative TBP distillation) and D6299 (for applying quality control charting to ensure analytical performance).
📊 Applicable Range and Sample Specifications
The following tables summarize the critical operational parameters and material restrictions defined by the standard.
| 🟦 Parameter | 📏 Specification (SI Units) |
|---|---|
| Initial Boiling Point (IBP) | > 174 °C (345 °F) |
| Final Boiling Point (FBP) | < 700 °C (1292 °F) |
| Carbon Number Range | C10 to C90 |
| Primary Detector | Flame Ionization Detector (FID) |
| 🛢️ Sample Matrix | 🎯 Suitability / Recommendation |
|---|---|
| Petroleum Distillates (IBP > 174 °C) | ✅ Suitable |
| Naphthas, Gasolines, Reformates | ❌ Use D2887 or D7096 |
| Crude Oils, Atmospheric Residues | ❌ Use D7169 |
| Alcohols, Ethers, Acids | ❌ Not Applicable |
The standard explicitly states that the values stated in SI units are to be regarded as standard. Inch-pound units are provided for informational purposes only. Adherence to these limits is crucial for obtaining valid and reproducible boiling point distribution data.
❓ Frequently Asked Questions
🔍 What is the precise boiling range covered by D6352-24?
The test method covers petroleum distillate fractions with an initial boiling point greater than 174 °C (345 °F) and a final boiling point of less than 700 °C (1292 °F).
💡 Can D6352-24 be used to analyze gasoline blending components?
No. The method is strictly not applicable for low molecular weight components found in naphthas, reformates, and gasolines. Test Methods D2887 or D7096 are recommended for gasoline-range materials.
⚡ What is the carbon number range quantified by this method?
The method is applicable for distillate fractions spanning a carbon number range from C10 to C90.
📌 Which detector is specified for use in this test method?
The test method relies on a Flame Ionization Detector (FID). The standard references Practice E594 for the specific testing and calibration requirements of the FID system.