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D6316-17 – Standard Test Method Technical Guide
🔬 Scope and Application of D6316-17
ASTM D6316-17 establishes a standardized framework for the determination of total, combustible, and carbonate carbon remaining in solid byproducts of combustion from boiler furnaces and similar reactors. These residues include ash, flyash, char, slag, and similar materials. The test method is essential for evaluating the performance of industrial boilers and combustion systems.
The determination of total carbon relies on the oxidative thermal decomposition of a weighed sample in a closed system. After complete oxidation and purification of the resulting gaseous products, the carbon dioxide produced is measured by techniques such as thermal conductivity, infrared detection, gravimetric analysis, or coulometric titration. The method intentionally integrates several established ASTM techniques for specific carbon measurements, allowing flexibility for the user.
⚡ Standard Scope Note: The values stated in SI units are to be regarded as standard. The user of this standard is responsible for establishing appropriate safety, health, and environmental practices prior to use, as outlined in Section 1.5 and 1.6 of the standard.
⚙️ Determination of Total, Carbonate, and Combustible Carbon
Total Carbon (TC). All carbon present in the residue, both organic and inorganic, is converted to CO₂ via high-temperature combustion. This is typically accomplished following the principles of Test Methods D5373 or D3178.
Carbonate Carbon (ICC). Inorganic carbon present as mineral carbonates (e.g., CaCO₃, MgCO₃) is liberated by treating the sample with a strong acid. The evolved CO₂ is captured and measured quantitatively, following the principles established in Test Method D1756.
Combustible Carbon (CC). This is the primary value of interest for combustion efficiency calculations, representing the carbon that failed to burn completely. It is calculated by the difference between the total carbon and the carbonate carbon present in the residue.
Combustible Carbon = Total Carbon – Carbonate Carbon
Alternative Procedure. Per Section 1.4, the standard allows for the sample to be acidified to evolve carbonate carbon prior to analysis. In this scenario, the total carbon measured in the acidified residue is reported directly as the combustible carbon, simplifying the workflow for high-carbonate materials.
| 🔬 Carbon Fraction | ⚙️ Typical Technique | 📏 Reference Standard |
|---|---|---|
| Total Carbon (TC) | Oxidative Thermal Decomposition / IR Detection | D5373 |
| Carbonate Carbon (ICC) | Acid Evolution & Gravimetry | D1756 |