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ASTM D6173-97(2005)

(Test Method)

Standard Test Method for Determination of Various Anionic Surfactant Actives by Potentiometric Titration

Standard Test Method for Determination of Various Anionic Surfactant Actives by Potentiometric Titration

SIGNIFICANCE AND USE
The most common anionic surfactants presented in this test method are used widely in synthetic detergents and other household cleaners. Current analysis of the active matter in these anionic surfactants involves the two-phase aqueous/chloroform titration with a mixed indicator, organic dyes such as disulphine blue/dimidium bromide (see Test Method D 3049), and methylene blue (see Test Method D 1681). This test method eliminates the use of hazardous chloroform, the use of which is restricted for environmental and toxicological reasons.
This test method also describes the titration of various ratio blends of sodium alkylbenzene sulfonate and sodium xylene sulfonate. Active matter content in these blends is attributable directly to sodium alkylbenzene sulfonate. Therefore, the presence of various amounts of sodium xylene sulfonate in these blends does not interfere with the determination of percent actives.
SCOPE
1.1 This test method is based on a potentiometric titration of common anionic surfactants and blends of anionic surfactant with a hydrotrope. This test method solely is intended for the analysis of active matter in the following surfactants: alcohol ether sulfate, alpha olefin sulfonate, alkylbenzene sulfonic acid, alcohol sulfate, sodium alkylbenzene sulfonate/sodium xylene sulfonate blend (5:1), sodium alkylbenzene sulfonate/sodium xylene sulfonate blend (16:1), and sodium alkylbenzene sulfonate/sodium xylene sulfonate blend (22:1). It has not been tested for surfactant formulations.
1.2 This standard does not purport to address all 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. Material Safety Data Sheets are available for reagents and materials. Review them for hazards prior to usage.

General Information

Status
Historical
Publication Date
30-Apr-2005
ICS
71.040.99 - Other standards related to analytical chemistry
Technical Committee
D12 - Soaps and Other Detergents
Drafting Committee
D12.12 - Analysis and Specifications of Soaps, Synthetics, Detergents and their Components
Current Stage
Ref Project

Relations

Replaces
ASTM D6173-97 - Standard Test Method for Determination of Various Anionic Surfactant Actives by Potentiometric Titration
Effective Date
01-May-2005

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ASTM D6173-97(2005) - Standard Test Method for Determination of Various Anionic Surfactant Actives by Potentiometric TitrationASTM D6173-97(2005) - Standard Test Method for Determination of Various Anionic Surfactant Actives by Potentiometric Titration
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ASTM D6173-97(2005) - Standard Test Method for Determination of Various Anionic Surfactant Actives by Potentiometric Titration
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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: D6173 − 97(Reapproved 2005)
Standard Test Method for
Determination of Various Anionic Surfactant Actives by
1
Potentiometric Titration
This standard is issued under the fixed designation D6173; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision.Anumber in parentheses indicates the year of last reapproval.A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
1. Scope 3.1.1 active matter, n—the organic surface-active material
present in the detergent.Also defined in Terminology D459 as
1.1 Thistestmethodisbasedonapotentiometrictitrationof
active ingredient of detergents.
common anionic surfactants and blends of anionic surfactant
with a hydrotrope. This test method solely is intended for the
4. Summary of Test Method
analysis of active matter in the following surfactants: alcohol
ether sulfate, alpha olefin sulfonate, alkylbenzene sulfonic
4.1 This test method describes a potentiometric titration
acid, alcohol sulfate, sodium alkylbenzene sulfonate/sodium
procedure for determining active matter in anionic surfactant.
xylene sulfonate blend (5:1), sodium alkylbenzene sulfonate/
Theanionicsurfactantisfirstdissolvedinwater,andthepHof
sodium xylene sulfonate blend (16:1), and sodium alkylben-
the solution is adjusted according to the type of anionic
zenesulfonate/sodiumxylenesulfonateblend(22:1).Ithasnot
surfactant being measured. In the potentiometric titration the
been tested for surfactant formulations.
anionic surfactant is titrated with a standard solution of
1.2 This standard does not purport to address all the safety
Hyamineusingasurfactantelectrode,andthereactioninvolves
concerns, if any, associated with its use. It is the responsibility
the formation of a complex between the anionic surfactant and
of the user of this standard to establish appropriate safety and
the cationic titrant (Hyamine), which then precipitates. At the
health practices and determine the applicability of regulatory
end point the surfactant electrode appears to respond to an
limitations prior to use. Material Safety Data Sheets are
excess of titrant with potential change large enough to give a
available for reagents and materials. Review them for hazards
well defined inflection in the titration curve.
prior to usage.
5. Significance and Use
2. Referenced Documents
2
2.1 ASTM Standards:
5.1 The most common anionic surfactants presented in this
D459Terminology Relating to Soaps and Other Detergents
test method are used widely in synthetic detergents and other
D1681Test Method for SyntheticAnionicActive Ingredient
household cleaners. Current analysis of the active matter in
in Detergents by Cationic Titration Procedure
these anionic surfactants involves the two-phase aqueous/
D3049Test Method for Synthetic Anionic Ingredient by
chloroform titration with a mixed indicator, organic dyes such
Cationic Titration
as disulphine blue/dimidium bromide (see Test Method
D3049), and methylene blue (see Test Method D1681). This
3. Terminology
test method eliminates the use of hazardous chloroform, the
3.1 Definitions of Terms Specific to This Standard:
use of which is restricted for environmental and toxicological
reasons.
1
This test method is under the jurisdiction ofASTM Committee D12 on Soaps
and Other Detergents and is the direct responsibility of Subcommittee D12.12 on
5.2 This test method also describes the titration of various
AnalysisandSpecificationsofSoaps,Synthetics,DetergentsandtheirComponents.
ratio blends of sodium alkylbenzene sulfonate and sodium
Current edition approved May 1, 2005. Published June 2005. Originally
xylene sulfonate. Active matter content in these blends is
approved in 1997. Last previous edition approved in 1997 as D6173-97. DOI:
10.1520/D6173-97R05.
attributable directly to sodium alkylbenzene sulfonate.
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
Therefore, the presence of various amounts of sodium xylene
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
sulfonate in these blends does not interfere with the determi-
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. nation of percent actives.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1

---------------------- Page: 1 ----------------------
D6173 − 97 (2005)
6. Apparatus 7.9 Sodium Lauryl Sulfate 0.0001 m Solution, buffered at
pH 4.00, with a graduated cylinder transfer 2 mL of sodium
6.1 Autotitration System, equipped with a delivery buret
3,4 laurylsulfate0.004Msolutiontoa150-mLbeaker.Add80mL
system, 10 or 20-mL capacity.
of deionized water and 1 mL of buffer solution pH 4.00 and
3,4
6.2 Phoeni
...

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1.1 This test method covers the determination of the amount of draindown in an uncompacted asphalt mixture sample when the sample is held at elevated temperatures comparable to those encountered during the production, storage, transport, and placement of the mixture. The test is particularly applicable to mixtures such as porous asphalt (open-graded friction course) and stone matrix asphalt (SMA).  
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Property  
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7.1  
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7.4  
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7.5  
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7.6  
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