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D1266-18 – Standard Test Method Technical Guide
📏 Scope and Specifications
The ASTM D1266-18 (Designation: 107/86) standard specifies the Lamp Method for the determination of total sulfur in liquid petroleum products. This test method is widely used in the petroleum industry and has been approved for use by agencies of the U.S. Department of Defense. It covers sulfur concentrations from 0.01 % to 0.4 % by mass.
For enhanced sensitivity, a special sulfate analysis procedure detailed in Annex A1 allows the determination of sulfur in concentrations as low as 5 mg/kg. All values in the standard are stated in SI units.
| 🟦 Parameter | 📐 Specification |
|---|---|
| Measurement Range (Standard Titration) | 0.01 % to 0.4 % by mass |
| Measurement Range (Annex A1 Sulfate) | As low as 5 mg/kg |
| Unit System | SI Units |
| Primary Standards Referenced | D129, D1552, D2784, D1193, D4057, D4177 |
⚠️ Interferences: While phosphorus compounds in commercial gasoline do not interfere, a specific correction is required for acids resulting from lead anti-knock fluids. Appreciable concentrations of other acid-forming or base-forming elements will interfere with the titration procedure, as no generalized correction is provided in these cases.
⚙️ Test Procedures and Applications
The standard provides two distinct procedures to accommodate varying sample physical properties. The Direct Burning Procedure (Section 9) is designed for volatile, clean-burning liquids like gasoline, kerosine, and naphtha that can be fully combusted in a standard wick lamp. The Blending Procedure (Section 10) is intended for more complex or heavier matrices, such as gas oils, distillate fuel oils, naphthenic acids, and alkyl phenols, which are not suitable for direct wick burning.
| ⚡ Procedure Type | 🔬 Applicable Materials |
|---|---|
| Direct Burning (Section 9) | Gasoline, Kerosine, Naphtha, and other wick-compatible liquids |
| Blending Procedure (Section 10) | Gas oils, Distillate fuel oils, Naphthenic acids, Alkyl phenols, High-sulfur products |
💡 Related Methods: For liquefied petroleum gases, refer to Test Method D2784. For heavier petroleum products that cannot be burned in a lamp, the standard recommends the High Pressure Decomposition Device Method (D129), the Quartz Tube Method (IP 63), or the High-Temperature Method (D1552).
❓ Frequently Asked Questions
🔍 What is the scope of ASTM D1266?
This standard covers the determination of total sulfur in liquid petroleum products within a concentration range of 0.01 % to 0.4 % by mass using the lamp method. The Annex A1 sulfate procedure extends detection to concentrations as low as 5 mg/kg.
💡 What sample types can be analyzed?
The method is applicable to volatile materials like gasoline, kerosine, and naphtha (via Direct Burning), as well as heavier materials like gas oils, distillate fuel oils, naphthenic acids, and alkyl phenols (via the Blending Procedure).
⚡ What are the key interferences in this method?
Phosphorus compounds do not generally interfere. A correction is provided for lead anti-knock fluids. However, appreciable amounts of other acid-forming or base-forming elements will interfere with the titration process.
📌 Which standards are referenced for sampling and quality?
Key referenced standards include D4057 and D4177 for sampling, D6299 and D6300 for statistical quality assurance and precision data, and D6792 for quality management systems in testing laboratories.