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D6379-21 – Standard Test Method Technical Guide
📐 Scope and Applicability
This test method covers the determination of mono-aromatic and di-aromatic hydrocarbon contents in aviation kerosenes and petroleum distillates boiling in the range from 50 °C to 300 °C, such as Jet A or Jet A-1 fuels. The total aromatic content is calculated from the sum of the individual aromatic hydrocarbon-types. It is applicable to distillates containing from 0.8 % to 44.0 % by mass mono-aromatic hydrocarbons, 0.23 % to 6.20 % by mass di-aromatic hydrocarbons, and 0.7 % to 50 % by mass total aromatics. Results may also be quoted in volume basis.
⚙️ Test Method and Instrumentation
The high performance liquid chromatographic method uses refractive index detection to quantify aromatic types. The following table summarizes the applicable aromatic content ranges:
| 🟦 Aromatic Type | 📏 Mass Basis (m/m) | 🎯 Volume Basis (v/v) |
|---|---|---|
| Mono-aromatic | 0.8 % to 44.0 % | 0.3 % to 41.4 % |
| Di-aromatic | 0.23 % to 6.20 % | 0.01 % to 5.00 % |
| Total aromatics | 0.7 % to 50 % | 0.30 % to 46.3 % |
📊 Precision and Key Properties
The precision of this test method has been established for kerosene boiling range distillates. The following table provides the precision ranges based on aromatic content:
| 🎯 Aromatic Type | 📐 Mass Basis (m/m) | ⚡ Volume Basis (v/v) |
|---|---|---|
| Mono-aromatic | 0.40 % to 44.0 % | 0.3 % to 41.4 % |
| Di-aromatic | 0.02 % to 6.20 % | 0.01 % to 5.00 % |
| Total aromatics | 0.40 % to 50.0 % | 0.30 % to 46.3 % |
💡 Precision data shown is for kerosene boiling range distillates. Users should verify correlation if comparing results with other test methods.
⚠️ Potential interferents include compounds containing sulfur, nitrogen, and oxygen. While mono-alkenes do not interfere, conjugated di- and poly-alkenes are possible interferents.
❓ Frequently Asked Questions
🔍 What is the boiling range for this test method?
The method is applicable to distillates boiling between 50 °C and 300 °C.
💡 What types of aromatic hydrocarbons are determined?
Mono-aromatic and di-aromatic hydrocarbons are determined, with total aromatics calculated from their sum.
⚡ Can samples with final boiling point above 300 °C be analyzed?
No, samples with final boiling point greater than 300 °C containing tri-aromatic and higher polycyclic compounds are not determined by this method. They should be analyzed by Test Method D6591 or equivalent.
📌 What detection method is employed?
Refractive index detection is used in conjunction with high performance liquid chromatography.