ASTM D4607-14(2021)

Standard Test Method for Determination of Iodine Number of Activated Carbon

SIGNIFICANCE AND USE
4.1 The iodine number is a relative indicator of porosity in an activated carbon. It does not necessarily provide a measure of the carbon's ability to absorb other species. Iodine number may be used as an approximation of surface area for some types of activated carbons (see Test Method C819). However, it must be realized that any relationship between surface area and iodine number cannot be generalized. It varies with changes in carbon raw material, processing conditions, and pore volume distribution (see Terminology D2652).  
4.2 The presence of adsorbed volatiles, sulfur, and water extractables may affect the measured iodine number of an activated carbon.
SCOPE
1.1 This test method covers the determination of the relative activation level of unused or reactivated carbons by adsorption of iodine from aqueous solution. The amount of iodine absorbed (in milligrams) by 1 g of carbon using test conditions listed herein is called the iodine number.  
1.2 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.  
1.3 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use. Specific hazard statements are given in Section 7.  
1.4 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.

General Information

• Status: Published
• Publication Date: 31-May-2021
• ICS: 75.160.10 - Solid fuels
• Technical Committee: D28 - Activated Carbon
• Drafting Committee: D28.02 - Liquid Phase Evaluation

Relations

• Refers: ASTM D3860-98(2020) - Standard Practice for Determination of Adsorptive Capacity of Activated Carbon by Aqueous Phase Isotherm Technique
• Effective Date: 01-Jun-2020

Standards Content (Sample)

This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the
Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
Designation: D4607 − 14 (Reapproved 2021)
Standard Test Method for
1
Determination of Iodine Number of Activated Carbon
This standard is issued under the fixed designation D4607; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
1. Scope E11 Specification for Woven Wire Test Sieve Cloth and Test
Sieves
1.1 Thistestmethodcoversthedeterminationoftherelative
E177 Practice for Use of the Terms Precision and Bias in
activation level of unused or reactivated carbons by adsorption
ASTM Test Methods
of iodine from aqueous solution. The amount of iodine
E287 Specification for Laboratory Glass Graduated Burets
absorbed (in milligrams) by1gof carbon using test conditions
E288 Specification for Laboratory Glass Volumetric Flasks
listed herein is called the iodine number.
E300 Practice for Sampling Industrial Chemicals
1.2 The values stated in SI units are to be regarded as
2.2 NIST Publication:
standard. No other units of measurement are included in this 4
Circular 602 Testing of Glass Volumetric Apparatus
standard.
3. Summary of Test Method
1.3 This standard does not purport to address all of the
safety concerns, if any, associated with its use. It is the
3.1 This test method is based upon a three-point adsorption
responsibility of the user of this standard to establish appro-
isotherm (see Practice D3860). A standard iodine solution is
priate safety, health, and environmental practices and deter-
treated with three different weights of activated carbon under
mine the applicability of regulatory limitations prior to use.
specified conditions. The carbon-treated solutions are filtered
Specific hazard statements are given in Section 7.
toseparatethecarbonfromthetreatediodinesolution(filtrate).
1.4 This international standard was developed in accor-
Iodine remaining in the filtrate is measured by titration. The
dance with internationally recognized principles on standard-
amount of iodine removed per gram of carbon is determined
ization established in the Decision on Principles for the
for each carbon dosage and the resulting data used to plot an
Development of International Standards, Guides and Recom-
adsorption isotherm. The amount of iodine adsorbed (in
mendations issued by the World Trade Organization Technical
milligrams) per gram of carbon at a residual iodine concentra-
Barriers to Trade (TBT) Committee.
tion of 0.02 N is reported as the iodine number.
3.2 Iodine concentration in the standard solution affects the
2. Referenced Documents
capacity of an activated carbon for iodine adsorption.
2
2.1 ASTM Standards:
Therefore, the normality of the standard iodine solution must
C819 Test Method for Specific Surface Area of Carbon or
be maintained at a constant value (0.100 6 0.001 N) for all
3
Graphite (Withdrawn 1987)
iodine number measurements.
D1193 Specification for Reagent Water
3.3 The apparatus required consists of various laboratory
D2652 Terminology Relating to Activated Carbon
glasswareusedtopreparesolutionsandcontactcarbonwiththe
D2867 Test Methods for Moisture in Activated Carbon
standard iodine solution. Filtration and titration equipment are
D3860 Practice for Determination ofAdsorptive Capacity of
also required.
Activated Carbon by Aqueous Phase Isotherm Technique
4. Significance and Use
4.1 The iodine number is a relative indicator of porosity in
1
This test method is under the jurisdiction of ASTM Committee D28 on
an activated carbon. It does not necessarily provide a measure
ActivatedCarbonandisthedirectresponsibilityofSubcommitteeD28.02onLiquid
of the carbon’s ability to absorb other species. Iodine number
Phase Evaluation.
may be used as an approximation of surface area for some
Current edition approved June 1, 2021. Published June 2021. Originally
approved in 1986. Last previous edition approved in 2014 as D4607 – 14. DOI:
types of activated carbons (see Test Method C819). However,
10.1520/D4607-14R21.
it must be realized that any relationship between surface area
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
and iodine number cannot be generalized. It varies with
contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website.
3 4
The last approved version of this historical standard is referenced on Available from National Institute of Standards and Technology (NIST), 100
www.astm.org. Bureau Dr., Stop 1070, Gait
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