ASTM D7385-07

Standard Guide for Estimating Carbon Saturation by Temperature Rise upon Immersion

SIGNIFICANCE AND USE
It is often useful to estimate the degree of saturation, and hence the expected remaining service life, of activated carbon that has been in use for some time. This guide is applicable when such information must be obtained fairly rapidly under field conditions without access to optimal analytical instruments.3
SCOPE
1.1 This guide covers the measurement of the temperature rise resulting from the heat of immersion when a known mass of a specified organic liquid is added to a sample of activated carbon. If the carbon has been in use as an adsorbent and may therefore be partially or fully exhausted, its degree of saturation may be estimated by comparing its temperature rise with that of an unused sample of the same activated carbon.
1.2 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.
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.

General Information

• Status: Historical
• Publication Date: 30-Sep-2007
• ICS: 07.030 - Physics. Chemistry
• Technical Committee: D28 - Activated Carbon
• Drafting Committee: D28.04 - Gas Phase Evaluation Tests

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NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.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: D7385 − 07
StandardGuide for
Estimating Carbon Saturation by Temperature Rise upon
Immersion
This standard is issued under the fixed designation D7385; 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 saturation of a used carbon is estimated by comparing its
temperature rise with that of the original unused activated
1.1 This guide covers the measurement of the temperature
carbon of equivalent moisture content, measured under the
rise resulting from the heat of immersion when a known mass
same conditions. If no such reference sample is available, a
of a specified organic liquid is added to a sample of activated
commercial unused activated carbon of the same physical type
carbon. If the carbon has been in use as an adsorbent and may
from a reputable manufacturer may be substituted; such
therefore be partially or fully exhausted, its degree of satura-
substitution should be noted in the report.
tion may be estimated by comparing its temperature rise with
that of an unused sample of the same activated carbon.
5. Significance and Use
1.2 The values stated in SI units are to be regarded as
5.1 It is often useful to estimate the degree of saturation,
standard. No other units of measurement are included in this
and hence the expected remaining service life, of activated
standard.
carbon that has been in use for some time. This guide is
1.3 This standard does not purport to address all of the
applicable when such information must be obtained fairly
safety concerns, if any, associated with its use. It is the
rapidly under field conditions without access to optimal ana-
responsibility of the user of this standard to establish appro-
lytical instruments.
priate safety and health practices and determine the applica-
6. Apparatus and Materials
bility of regulatory limitations prior to use.
6.1 Apparatus—The apparatus should consist of a container
2. Referenced Documents
such as a small bottle or flask to accommodate the carbon, the
2.1 ASTM Standards:
organic liquid, and a thermometer or thermocouple with a
D2652 Terminology Relating to Activated Carbon
range to allow for a temperature rise of up to about 30 ºC,
D2867 Test Methods for Moisture in Activated Carbon
graduated in intervals of 0.5 ºC, with facility to interpolate to
E300 Practice for Sampling Industrial Chemicals
60.1 ºC. A liquid-in-glass thermometer should not use
mercury, because of the greater risk of breakage under field
3. Terminology
conditions. The container should be provided with a rubber
3.1 Terms related to this guide are defined in Terminology stopper or other suitable closure to seal the contents after the
D2652. carbon has been added to the organic liquid. Appropriate
containers include an Erlenmeyer or Florence flask of about
4. Summary of Guide
125 to 250 mL capacity or a similar-sized narrow-necked
bottle.
4.1 A measured volume of activated carbon is added to a
known volume of a selected organic liquid in a container
6.2 Materials—Many organic liquids that are insoluble in
provided with means to measure the liquid temperature. The
water but readily soluble in other adsorbates that may already
apparatus is sealed after the addition of the carbon and the
be on the carbon are potentially useful. Those that have been
maximum rise in temperature is recorded. The degree of
tried include mineral oil, hexane, cyclohexane, and kerosene.
Mineral oil is essentially harmless and not readily flammable,
1 so its use does not require warnings for personnel untrained in
This guide is under the jurisdiction of ASTM Committee D28 on Activated
Carbonand is the direct responsibility of Subcommittee D28.04 on Gas Phase
handling laboratory chemicals, but it has the disadvantage of
Evaluation Tests.
highviscosity,whichmayinhibitrapid
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