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D1072-23 – Standard Test Method Technical Guide
This article details the ASTM D1072-23 standard test method for total sulfur measurement in fuel gases. Utilizing combustion and barium chloride titration, it addresses sulfur concentrations from 25 to 700 mg/m³ for various gaseous fuels.
📐 Scope and Interferences
ASTM D1072-23 applies to total sulfur determination in combustible fuel gases including natural, manufactured, and mixed gases. It specifies sulfur concentrations between 25 and 700 mg/m³ (1 to 30 grains per 100 cubic feet). Interferences are minimal, but caution with alternative procedures is advised.
| 🟦 Parameter | 📏 Details |
|---|---|
| Applicable gases | Natural, manufactured, mixed, miscellaneous |
| Sulfur concentration | 25–700 mg/m³ (1–30 grains/100 ft³) |
| Standard in inch-pound units | Yes |
⚠️ Note: Users should verify gas composition as certain substances like ammonia may interfere if alternative collection methods are used.
⚙️ Test Procedure and Apparatus
The test involves burning a measured gas sample in sulfur-free air. The resulting sulfur oxides are captured in sodium carbonate, oxidized to sulfate, and titrated with barium chloride using THQ indicator. Specific apparatus requirements are critical for accuracy.
| ⚡ Apparatus | 🎯 Specification |
|---|---|
| Flow meter | Capillary type, ≥20 cm H₂O differential, ±0.5% precision |
| Vacuum system | 3 L/min flow per absorber, ~40 cm H₂O vacuum |
| Air-purifying system | ~200 mm H₂O pressure for burner manifold |
| Burner and absorbers | As per Appendix X1 |
💡 Tip: Regular calibration of flow meters and vacuum regulators ensures compliance with the required precision.
📊 Key Measured Properties and Accuracy
The method measures total sulfur by titration, with concentrations from 25 to 700 mg/m³. The indicator THQ allows precise endpoint detection. The flow meter must achieve ±0.5% precision for reliable results.
✅ Accuracy: Adhering to apparatus specifications ensures consistent and accurate sulfur determination.
❓ Frequently Asked Questions
🔍 What is the sulfur concentration range covered by this standard? It covers 25 to 700 mg/m³ (1 to 30 grains per 100 cubic feet).
💡 Which gases can be tested with this method? It applies to natural, manufactured, mixed, and other combustible fuel gases.
⚡ What are the key apparatus requirements? A capillary flow meter with ±0.5% precision, vacuum system with 3 L/min flow per absorber, and air-purifying system at 200 mm H₂O.
📌 Are there any known interferences? No known interferences for the standard method, but caution with alternative procedures.