ASTM-D1681:2005 Edition

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D1681-05 Standard Test Method for Synthetic Anionic Active Ingredient in Detergents by Cationic Titration Procedure

Published By	Publication Date	Number of Pages
ASTM	2005	7

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Categories: 71.100.40 - Surface active agents, ASTM

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Description

1.1 Direct titration of an anionic surfactant with a standardized cationic reagent is a simple and convenient method for the quantitative determination of the content of active ingredient. The end point is detffected by the transfer of a colored complex from an organic solvent phase to an aqueous phase. The relationship between anionic and cationic agents is not always stoichiometric, and for maximum accuracy the anionic type of interest should first be characterized and then used to standardize the cationic reagent. In most cases, however, the different anionic surfactants likely to be encountered react in the same proportions. That is, a cationic titrating solution standardized against a characterized anionic agent can be used to analyze other anionics of known molecular weights.

1.2 This test method is applicable to alkylaryl sulfonates and fatty alkyl sulfates. Low results are obtained with alkylbenzene sulfonates having the alkyl chain length less than eight carbon atoms. Low results are also obtained for alkyl sulfates with the alkyl chain length of less than twelve carbon atoms. The anionic surfactants characterized in accordance with Sections should be the sodium salt and not amine, ammonium, or potassium salts. In case only amine or ammonium salts are available, they should be first converted to the sodium salt before proceeding with this analysis.

1.3 The analytical procedures appear in the following order:

1.4 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. For a specific hazards statement, see Section .

PDF Catalog

PDF Pages	PDF Title
1	Scope Referenced Documents Summary of Test Method Significance and Use Interferences Reagents
2	Hazards Solvent Procedure Reagents Procedure Scope
3	Apparatus Reagents and Materials Procedure for Qualitative Determination Procedure for Quantitative Determination Calculations
4	Reagents Procedure Calculations Apparatus Reagents Procedure Calculations
5	Apparatus Reagents and Materials Procedure Calculations Precision Apparatus
6	Procedure Calculations Precision FIG. 1
7	TABLE 1

Additional information

	Sections
Part I. Determination of Surfactant, SO 3 Content, and Solution Molarity	18-20
Part II. Determination of Surfactant, SO 3 and Active IngredientContents Combining Weight, and Solution Molarity	21-24
Characterization of Anionic Surfactant Standard:
Determination of Sodium Chloride (NaCl) Content	12-17
Quantitative Determination of Anionic Surfactant by Cationic Titration	30-33
Standardization of Cationic Reagent	25-29
Separation of Oil-Free Sulfonate	10 and 11
Separation of Alcohol-Soluble Matter	8 and 9
ICS Codes	71.100.40 - Surface active agents

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ASTM-D1681:2005 Edition

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