ASTM D6173 Various Anionic Surfactant Actives by Potentiometric Titration
The ASTM D6173 test method explains how to determine the active matter in anionic surfactants using a potentiometric titration process. This test method eliminates the use of hazardous chloroform, the use of which is restricted for environmental and toxicological reasons.
Scope:
The ASTM D6173 test method is solely used for determining the active matter in the following surfactants: alcohol ether sulfate, alpha-olefin sulfonate, alkyl benzene sulfonic acid, alcohol sulfate, sodium alkylbenzene sulfonate/sodium xylene sulfonate blend (5:1), sodium alkylbenzene sulfonate/so (22:1). Titration of various ratio mixes of sodium alkylbenzene sulfonate and sodium xylene sulfonate is also described in this test technique. This test method’s most popular anionic surfactants are widely utilized in synthetic detergents and other home cleaners.
Test procedure:
The ASTM D6173 test method describes a potentiometric titration procedure for determining the active matter in anionic surfactants. After dissolving the anionic surfactant in water, the pH of the solution is adjusted to match the kind of anionic surfactant being tested. A surfactant electrode is used to titrate an anionic surfactant with a standard solution of hyamine, and the reaction involves the creation of a complex between the anionic surfactant and the cationic titrant (hyamine), which then precipitates. The surfactant electrode appears to respond to an excess of titrant at the endpoint with a large enough potential change to produce a well-defined inflection in the titration curve.
Video 01: Surfactant titration analysis
Specimen size:
A sample of approximately 0.016 meq/4.0 mL anionic substance is utilized for the ASTM D6173 test, which is measured to the nearest 0.1 mg.
Data:
In ASTM D6173, the percent actives in anionic surfactants are calculated as follows:
where:
A = standard hyamine 1622 solution required for titration
N = normality of the standard hyamine 1622 solution
M = molecular weight of the anionic surfactant
D = initial dilution of the sample
S = weight of the sample
A= aliquot taken for titration
Conclusion:
The ASTM D6173 test method is solely used for determining the active matter in the following surfactants: alcohol ether sulfate, alpha-olefin sulfonate, alkyl benzene sulfonic acid, alcohol sulfate, sodium alkylbenzene sulfonate/sodium xylene sulfonate blend (5:1), sodium alkylbenzene sulfonate/so (22:1).
Talk to Our Experts Today!
Submit your contact info and we’ll get back to you within 24 hours
Full Spectrum of ASTM Material Testing — Backed by 2,000+ Trusted Lab Partners
ASTM standards for chemical composition, physical properties, failure analysis, and other routine and non-routine testing for polymers and plastics
ASTM standards for determination of mechanical, physical, and thermal properties, and performance of monolithic and composite ceramics
ASTM standards guiding various destructive, non-destructive and analytical tests for quality control of different metals and alloys
ASTM standards for chemical analysis of solid, liquid and gaseous materials for specification compliance and quality control
ASTM standards for various chemical, physical, stability and exposure analysis of paints and coatings
Our Services
Metrology
A variety of microscopy and spectroscopy tools available for precise measurements from the nano to the meter scale.
Learn More
Materials Testing
ASTM and ISO standard and custom chemical, mechanical, thermal, corrosion tests, etc. for all materials metals, ceramic or polymers.
Learn More
Product Testing
Thousands of tests for product quality and reliability under heat, humidity, temperature shock, vibration, drop, electrostatic discharge.
Learn More
