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D5453-24 – Standard Test Method Technical Guide
📋 Overview and Scope of D5453-24
ASTM D5453-24 is a standard test method for determining total sulfur in liquid hydrocarbons, including light hydrocarbons, spark ignition engine fuel, diesel engine fuel, and engine oil. It applies to samples with boiling points ranging from approximately 25 °C to 400 °C and viscosities between 0.2 cSt and 20 cSt at room temperature. This method is validated for naphthas, distillates, ethanol, fatty acid methyl ester (FAME), gasoline, oxygen enriched gasoline (E-85, M-85, RFG), diesel, biodiesel, diesel/biodiesel blends, and jet fuel. Sulfur concentrations from 1.0 mg/kg to 8000 mg/kg can be analyzed, with pooled limit of quantification (PLOQ) estimates ranging from less than 1.0 mg/kg to less than 5.0 mg/kg.
The values stated in SI units are standard. Users must establish appropriate safety, health, and environmental practices, referencing warning statements in sections 4.1, 8.3, 8.4, 9, and 10.1.
🔬 Test Method Procedure and Principle
The sample is directly injected or placed in a sample boat and inserted into a high-temperature combustion tube. In an oxygen-rich atmosphere, sulfur is oxidized to sulfur dioxide (SO₂). Combustion gases are dried to remove water, then exposed to ultraviolet (UV) light. The SO₂ absorbs UV energy, transitioning to an excited state (SO₂*), which emits fluorescence as it returns to stability. This fluorescence is measured and correlated to total sulfur content. The method follows standardized sampling practices per ASTM D4057 and D4177.
📊 Precision and Interlaboratory Validation
Three separate interlaboratory studies (ILS) and three additional investigations have confirmed applicability across diverse fuels. Precision data is based on pooled results, with the PLOQ calculated below 1.0 mg/kg to below 5.0 mg/kg. The method supports statistical quality assurance per ASTM D6299.
| 🟦 Parameter | 📏 Value |
|---|---|
| Boiling Range | 25 °C to 400 °C |
| Viscosity Range | 0.2 cSt to 20 cSt (mm²/s) |
| Sulfur Content Range | 1.0 mg/kg to 8000 mg/kg |
| Pooled Limit of Quantification | <1.0 to <5.0 mg/kg |
💡 Technical Note: For optimal combustion, verify sample viscosity stays within 0.2 cSt to 20 cSt. Dilute high-sulfur samples (above 8000 mg/kg) to fit calibration range and avoid detector saturation.
⚠️ Safety Advisory: The method uses high-temperature combustion and UV light. Always follow warning protocols in sections 4.1, 8.3, 8.4, 9, and 10.1 of D5453-24. Use personal protective equipment and proper ventilation.
❓ Frequently Asked Questions
🔍 What types of samples can be analyzed?
This test method covers naphthas, distillates, engine oil, ethanol, FAME, gasoline, oxygen enriched gasoline (E-85, M-85, RFG), diesel, biodiesel, blends, and jet fuel.
💡 How does the UV fluorescence method work?
Sample combustion oxidizes sulfur to SO₂. After water removal, UV light excites SO₂ to SO₂*, which emits fluorescence proportional to sulfur content.
⚡ What is the sulfur content range?
The method quantifies total sulfur from 1.0 mg/kg to 8000 mg/kg, with pooled LOQ below 5.0 mg/kg.
📌 What precision estimates are available?
Three interlaboratory studies provide precision data. PLOQ calculations range from less than 1.0 mg/kg to less than 5.0 mg/kg (see Sections 10 and 17.1).