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D4807-05 – Standard Test Method Technical Guide
The ASTM D4807-05 (Reapproved 2020) / MPMS Chapter 10.8 standard provides a precise gravimetric method for determining sediment in crude oils via membrane filtration. This standard, under the joint jurisdiction of ASTM D02 and the API Committee on Petroleum Measurement, is a critical reference for custody transfer operations and crude oil quality assessment.
📐 Scope and Application
This test method covers the determination of sediment in crude oils by membrane filtration and is validated for samples with sediment levels up to approximately 0.15 % by mass. The primary unit of measure is mass %, but an equation for conversion to volume % is provided. The values stated in SI units are to be regarded as the standard. Users must adhere to specific safety warnings regarding the use of hot toluene and crude oil handling found in Section 6.1 and Annex A1. The standard was developed following internationally recognized standardization principles established by the WTO TBT Committee.
| 📜 Referenced Standard | 🎯 Purpose |
|---|---|
| D473 / MPMS 10.1 | Alternative Sediment Test (Extraction Method) |
| D4057 / MPMS 8.1 | Manual Sampling of Petroleum and Petroleum Products |
| D4177 / MPMS 8.2 | Automatic Sampling of Petroleum and Petroleum Products |
| D5854 / MPMS 8.3 | Mixing and Handling of Liquid Samples of Petroleum |
| D4865 | Generation and Dissipation of Static Electricity |
⚙️ Summary of Test Procedure
Following the sample mixing and handling requirements of Practice D5854, a test portion of the crude oil is dissolved in hot toluene meeting ISO 5272:1979 specifications. This solution is filtered under vacuum through a pre-weighed 0.45 µm porosity membrane filter. The filter and retained sediment are washed thoroughly to remove residual oil, dried to a constant weight, and the sediment mass percentage is calculated relative to the original sample mass.
| 📏 Key Parameter | ⚙️ Specification |
|---|---|
| Filter Porosity | 0.45 µm |
| Required Solvent | Hot Toluene (ISO 5272:1979) |
| Filtration Method | Vacuum Filtration |
| Validated Sediment Range | Up to ~0.15 % by mass |
| Standard Reporting Unit | Mass % (vol% conversion in Note 6) |
📊 Measured Results and Reporting
The final result is reported as sediment % by mass. Given the method’s sensitivity and the low sediment range, strict adherence to the prescribed mixing (MPMS 8.3 / D5854) and sampling (MPMS 8.1-8.2 / D4057-D4177) practices is critical for accuracy and repeatability.
⚠️ Safety Warning: This method involves hot toluene and crude oil. Review Section 6.1 and Annex A1 for specific warning statements. Awareness of static electricity hazards as outlined in Guide D4865 is essential for safe laboratory operation.
💡 Technical Tip: Complete dissolution of the crude oil sample in hot toluene is the most critical step for accuracy. Incomplete dissolution can lead to high-biased results, while excessive heating may alter the sediment components. Using toluene conforming strictly to ISO 5272 helps ensure procedural consistency.
❓ Frequently Asked Questions
🔍 What sediment range is this test method validated for?
This method is validated for crude oils with sediment levels up to approximately 0.15 % by mass. Samples exceeding this range should be tested using alternative methods such as D473 / MPMS Chapter 10.1.
💡 What type of solvent is specified for the procedure?
The standard specifies the use of hot toluene that conforms to the requirements of ISO 5272:1979 for dissolving the crude oil test portion.
⚡ What is the required membrane filter pore size?
The procedure requires a membrane filter with a specified porosity of 0.45 µm to retain sediment particles.
📌 What is the standard unit of reporting for the sediment results?
The primary reporting unit is mass %. The standard includes a specific equation for converting results to a percentage by volume (located in Note 6 of the text).