ASTM D4607-94(2006)

Standard Test Method for Determination of Iodine Number of Activated Carbon

SIGNIFICANCE AND USE
The iodine number is a relative indicator of porosity in an activated carbon. It does not necessarily provide a measure of the carbon’ 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 C 819). 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 Definitions D 2652).  
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 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 and health practices and determine the applicability of regulatory limitations prior to use. Specific hazard statements are given in Section 7.

General Information

• Status: Historical
• Publication Date: 30-Sep-2006
• ICS: 71.040.30 - Chemical reagents
• Technical Committee: D28 - Activated Carbon
• Drafting Committee: D28.02 - Liquid Phase Evaluation

Relations

• Replaces: ASTM D4607-94(1999) - Standard Test Method for Determination of Iodine Number of Activated Carbon
• Effective Date: 01-Oct-2006
• Replaced By: ASTM D4607-94(2011) - Standard Test Method for Determination of Iodine Number of Activated Carbon
• Effective Date: 01-Mar-2011

Standards Content (Sample)

NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
Contact ASTM International (www.astm.org) for the latest information
Designation:D4607–94 (Reapproved 2006)
Standard Test Method for
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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.
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1. Scope Circular 602—Testing of Glass Volumetric Apparatus
1.1 Thistestmethodcoversthedeterminationoftherelative
3. Summary of Test Method
activation level of unused or reactivated carbons by adsorption
3.1 This test method is based upon a three-point adsorption
of iodine from aqueous solution. The amount of iodine
isotherm (see Practices D3860). A standard iodine solution is
absorbed (in milligrams) by1gof carbon using test conditions
treated with three different weights of activated carbon under
listed herein is called the iodine number.
specifiedconditions.Thecarbontreatedsolutionsarefilteredto
1.2 This standard does not purport to address all of the
separate the carbon from the treated iodine solution (filtrate).
safety concerns, if any, associated with its use. It is the
Iodine remaining in the filtrate is measured by titration. The
responsibility of the user of this standard to establish appro-
amount of iodine removed per gram of carbon is determined
priate safety and health practices and determine the applica-
for each carbon dosage and the resulting data used to plot an
bility of regulatory limitations prior to use. Specific hazard
adsorption isotherm. The amount of iodine adsorbed (in
statements are given in Section 7.
milligrams) per gram of carbon at a residual iodine concentra-
2. Referenced Documents tion of 0.02 N is reported as the iodine number.
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3.2 Iodine concentration in the standard solution affects the
2.1 ASTM Standards:
capacity of an activated carbon for iodine adsorption. There-
C819 Test Method for Specific Surface Area of Carbon or
fore, the normality of the standard iodine solution must be
Graphite
maintained at a constant value (0.100 6 0.001N) for all iodine
D1193 Specification for Reagent Water
number measurements.
D2652 Terminology Relating to Activated Carbon
3.3 The apparatus required consists of various laboratory
D2867 Test Methods for Moisture in Activated Carbon
glasswareusedtopreparesolutionsandcontactcarbonwiththe
D3860 Practice for Determination of Adsorptive Capacity
standard iodine solution. Filtration and titration equipment are
of Activated Carbon by Aqueous Phase Isotherm Tech-
also required.
nique
E11 SpecificationforWovenWireTestSieveClothandTest
4. Significance and Use
Sieves
4.1 The iodine number is a relative indicator of porosity in
E177 Practice for Use of the Terms Precision and Bias in
an activated carbon. It does not necessarily provide a measure
ASTM Test Methods
of the carbon’s ability to absorb other species. Iodine number
E287 Specification for Laboratory Glass Graduated Burets
may be used as an approximation of surface area for some
E288 Specification for Laboratory Glass Volumetric Flasks
types of activated carbons (see Test Method C819). However,
E300 Practice for Sampling Industrial Chemicals
it must be realized that any relationship between surface area
2.2 NIST Publication:
and iodine number cannot be generalized. It varies with
changes in carbon raw material, processing conditions, and
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This test method is under the jurisdiction of ASTM Committee D28 on
pore volume distribution (see Definitions D2652).
ActivatedCarbonandisthedirectresponsibilityofSubcommitteeD28.02onLiquid
4.2 The presence of adsorbed volatiles, sulfur; and water
Phase Evaluation.
extractables may affect the measured iodine number of an
Current edition approved Oct. 1, 2006. Published November 2006. Originally
approved in 1986. Last previous edition approved in 1999 as D4607 – 94 (1999). activated carbon.
DOI: 10.1520/D4607-94R06.
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For referenced ASTM standards, visit the ASTM website, www.astm.org, or
contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM
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Standards volume information, refer to the standard’s Document Summary page on Available from National Institute of Standards and Technology (NIST), 100
the ASTM website. Bureau Dr., Stop 1070, Gaithersburg, MD 20899-1070, http://www.nist.gov.
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D4607–94 (2006)
5. Apparatus Safety Data Sheet” (MSDS) for each reagent listed in Section
6 should be read and understood. Special precautions to be
NOTE 1—All volumetric measuring equipment should meet or exceed
taken during use of each reagent are included on the
...