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D5059-21 – Standard Test Method Technical Guide
ASTM D5059-21 specifies standard test methods for determining lead and manganese content in gasoline using X-ray fluorescence spectroscopy (XRF). These methods are critical for compliance with fuel additive regulations and quality control in petroleum products.
📐 Test Methods and Concentration Ranges
The standard includes four test methods: Test Methods A and B for lead at concentrations from 0.10 to 5.0 g Pb/US gal, Test Method C for lead from 0.010 to 0.50 g Pb/US gal, and Test Method D for manganese in aviation gasoline from 25 to 250 mg Mn/L. These methods compensate for normal gasoline composition variations and are independent of additive type.
| 🟦 Component | 📏 Test Method | 🎯 Concentration Range |
|---|---|---|
| Lead (Pb) | A & B | 0.10 – 5.0 g Pb/US gal |
| Lead (Pb) | C | 0.010 – 0.50 g Pb/US gal |
| Lead (Pb) | All | 0.012 – 6.0 g Pb/UK gal |
| Lead (Pb) | All | 0.0026 – 1.32 g Pb/L |
| Manganese (Mn) | D | 25 – 250 mg Mn/L |
⚙️ Procedure and Quality Assurance
Test Method A involves mixing one volume of sample with an equal volume of bismuth internal standard before XRF analysis. The standard emphasizes adherence to statistical quality assurance practices (D6299) and quality management systems (D6792) to ensure reliable performance. Referenced documents include sampling practices D4057 and D4177.
💡 Tip: Calibrate the XRF instrument with standards that match the sample matrix to compensate for compositional variations and ensure accurate results.
⚠️ Warning: This standard does not address all safety concerns. Users must review specific hazard statements in Sections 5, 6, 11, and 18 before proceeding with testing.
📊 Reporting Units and Referenced Standards
SI units are the international standard, but in the United States, grams per US gallon are preferred for reporting lead content. The standard also references key ASTM practices for sampling and quality assurance.
| 📏 Standard | 📐 Title |
|---|---|
| D3341 | Lead in Gasoline – Iodine Monochloride Method |
| D4057 | Manual Sampling of Petroleum Products |
| D4177 | Automatic Sampling of Petroleum Products |
| D6299 | Statistical Quality Assurance for Analytical Systems |
| D6792 | Quality Management Systems in Testing Laboratories |
❓ Frequently Asked Questions
🔍 What is the scope of ASTM D5059-21?
These test methods cover the determination of lead and manganese content in gasoline by XRF.
💡 Which test method covers low lead concentrations?
Test Method C covers the range of 0.010 to 0.50 g Pb/US gal.
⚡ What are the preferred units for reporting in the US?
Grams per US gallon (g Pb/US gal) are preferred in the United States.
📌 What safety precautions are included?
Specific hazard statements are provided in Sections 5, 6, 11, and 18 of the standard.