ASTM D4607-14(2021) PDF

Overview

ASTM D4607-14(2021) is the internationally recognized standard test method for the determination of the iodine number of activated carbon. Published and maintained by ASTM International, this standard provides a reliable procedure for evaluating the relative activation level-specifically, the porosity-of both unused and reactivated carbon materials. The iodine number reported as milligrams of iodine adsorbed per gram of activated carbon serves as a relative indicator of the material’s ability to adsorb substances from aqueous solutions. This method is essential for manufacturers, users, and quality assurance teams seeking consistent and comparable assessments of activated carbon performance.

Key Topics

• Iodine Number Definition: Measures the amount of iodine (in mg) adsorbed by 1 g of activated carbon, reflecting porosity and relative activation.
• Scope of Application: Applies to both unused and reactivated activated carbons, using standardized procedures and reagents.
• Test Method Summary: Based on a three-point adsorption isotherm, the procedure involves contacting carbon samples of varying weights with a standard iodine solution, then measuring the amount of iodine remaining by titration.
• Significance and Limitations:
  • The iodine number is a relative measure of porosity and does not directly quantify the capacity of activated carbon to adsorb other chemical species.
  • The relationship between iodine number and surface area may vary depending on the carbon’s raw material, processing, and pore distribution.
  • Measurement may be affected by the presence of volatiles, sulfur, or water extractables.
• Units and Safety: All measurements are reported in SI units, and users must adhere to appropriate safety and environmental regulations when performing the test.

Applications

The ASTM D4607-14(2021) iodine number test is widely used in industries where activated carbon plays a critical role in purification, separation, and filtration processes. Key application areas include:

• Water and Wastewater Treatment: Ensuring activated carbon meets the necessary porosity specifications for removing organic contaminants from water supplies.
• Industrial Processing: Quality control in the production of activated carbon for use in food and beverage processing, pharmaceuticals, and air purification.
• Environmental Compliance: Demonstrating conformity to regulatory requirements by documenting the adsorptive capacity of activated carbon used in emissions control and remediation projects.
• Material Selection and Quality Assurance: Supporting procurement and selection processes by providing a standardized metric for comparing different activated carbon products.

This standard is also valuable for laboratories conducting research and development on adsorption materials, offering a repeatable and recognized benchmark for experimental comparisons.

Related Standards

For professionals utilizing ASTM D4607-14(2021), familiarity with related standards enhances testing integrity and ensures compatibility across procedures:

• ASTM D2652: Terminology relating to activated carbon.
• ASTM D2867: Test methods for moisture in activated carbon.
• ASTM D3860: Practice for determination of adsorptive capacity of activated carbon by aqueous phase isotherm technique.
• ASTM E11: Specification for woven wire test sieve cloth and test sieves.
• ASTM E287, E288: Specifications for volumetric laboratory glassware.
• ASTM D1193: Specification for reagent water.
• NIST Circular 602: Testing of glass volumetric apparatus (for equipment calibration).

By adhering to ASTM D4607-14(2021) and these related documents, organizations and laboratories can ensure the accuracy, repeatability, and international acceptance of their activated carbon testing results.

Keywords: ASTM D4607, activated carbon, iodine number, adsorption capacity, porosity measurement, water treatment, carbon testing standards, quality control, ASTM International, laboratory procedures.