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D2887-24 – Standard Test Method Technical Guide
🧪 Test Method Overview and Scope
ASTM D2887-24 defines a standard gas chromatographic method for determining the boiling range distribution of petroleum fractions and products. The method is applicable to materials with a final boiling point of 538 °C (1000 °F) or lower at atmospheric pressure, provided the total boiling range exceeds 55.5 °C (100 °F) and the vapor pressure is sufficiently low for ambient temperature sampling. The method simulates a true boiling point (TBP) curve using non-polar chromatographic columns and is often correlated against physical distillation methods such as D86, D1160, and D2892.
The standard is strictly not for gasoline analysis, which must be conducted per Test Method D7096. All values are recorded in SI units; information in parentheses (e.g., °F) is for reference only. Note that, as established in the standard (Note 1), temperature range conversions strictly use the factor 1.8 °F/°C.
⚠️ Critical Scope Limitation: Do not use D2887-24 for gasoline or gasoline components. Section 1.2 explicitly mandates the use of Test Method D7096 for these sample types.
⚙️ Procedure Selection: A vs. B
D2887-24 provides two distinct procedures to balance flexibility, speed, and applicability to specific sample matrices, including biodiesel blends.
| 📐 Feature | 🟦 Procedure A | ⚡ Procedure B (Accelerated) |
|---|---|---|
| Column Types | Packed & Capillary | 3 Specific Capillary Columns |
| Detectors | TCD or FID | FID (Flame Ionization) |
| Analysis Time | 14 min to 60 min | ~8 min |
| Sample Dilution | Permitted | Not Required |
| Biodiesel Mixtures | Not Specified | Includes B5, B10, B20 |
Procedure A offers maximum flexibility in column chemistry and detector choice (TCD or FID). It is suitable for general petroleum fraction analysis but requires longer run times. Procedure B, or Accelerated D2887, is restricted to three specific capillary columns and an FID, sacrificing some flexibility for a fast analysis time (~8 minutes). A key addition to the 2024 revision is its explicit validation for biodiesel blends B5, B10, and B20 without the need for sample dilution.
💡 Laboratory Efficiency Tip: For high-throughput labs analyzing mid-distillates and biodiesel blends (B5 to B20), Procedure B eliminates the dilution step and reduces analysis time to roughly 8 minutes, compared to the potential 60-minute runtime of Procedure A.
📊 Key Specifications and Data
Adherence to the temperature boundaries and reference standards is crucial for generating valid boiling range distribution data under D2887-24.
| 🎯 Parameter | 📏 SI Unit Value | 📐 Imperial Unit Value* |
|---|---|---|
| Maximum Final Boiling Point | 538 °C | 1000 °F |
| Minimum Boiling Range | 55.5 °C | 100 °F |
| Range Conversion Factor | — | 1.8 °F/°C |
The standard is intimately linked with other ASTM methods for cross-correlation. Data generated can be compared to physical distillations (D86, D1160, D2892). Quality assurance practices from D6299 and statistical assessment methods from D6708 are referenced to ensure robust laboratory performance and agreement between the two chromatographic procedures.
❓ Frequently Asked Questions
🔍 What is the maximum boiling point covered by D2887-24?
The method is applicable to materials with a final boiling point of 538 °C (1000 °F) or lower at atmospheric pressure as measured by this test method.
⚡ How do the analysis times differ between Procedure A and Procedure B?
Procedure A requires 14 to 60 minutes per analysis depending on column and detector configuration. The Accelerated D2887 (Procedure B) reduces this time to approximately 8 minutes.
💡 Can this test method be used for gasoline analysis?
No. The scope explicitly prohibits it. Gasoline samples and gasoline components must be analyzed using Test Method D7096 for boiling range distribution.
📌 What specific biodiesel blends can be analyzed with Procedure B?
Procedure B explicitly validates the analysis of samples containing biodiesel mixtures B5, B10, and B20, in addition to the petroleum fractions covered in Procedure A.