ASTM D3049-89(1996)e1

    Standard Test Method for Synthetic Anionic Ingredient by Cationic Titration

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    1. Scope

    1.1 This test method covers the determination of the amount of synthetic anionic ingredient in a surfactant by direct titration with a standardized cationic reagent. The test method is a simple and convenient means for the quantitative estimation of the anionic material. The end point is detected by the transfer of a colored complex from an organic solvent phase to an aqueous phase. The colored complex is formed by the addition of a solution of dye to a solution of the anionic surfactant. This complex is soluble in the organic-solvent phase and insoluble in the aqueous phase. When this solution is titrated with a standardized solution of a cationic reagent, the dye is displaced from the colored complex and, being water-soluble, migrates to the aqueous phase. Therefore, a cationic titrating solution that has been standardized against a characterized anionic agent can be used to analyze for other anionics of known molecular mass.

    1.2 This test method is applicable to alkylaryl sulfonates, alkyl sulfonates, alkyl sulfates and hydroxy-sulfates, alkyl- phenol- and fatty alcohol ethoxy-sulfates and dialkylsulfo- succinates. It applies to active materials containing one hydrophilic group per molecule.

    1.3 The analytical procedures appear in the following order:

    Sections Reagents 6 Primary Standard 8 Purity 8.2 Alcohols 8.3 Free Acid or Alkali 8.4 Preparation of Mixed Indicator Solution 9 Preparation of Hyamine Solution 10 Standardization of Hyamine Solution 11 General Procedure for Anionic-Active Material 12

    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. A precautionary statement appears in Section 7. Material Safety Data Sheets are available for reagents and materials. Review them for hazards prior to usage.

    2. Referenced Documents (purchase separately) The documents listed below are referenced within the subject standard but are not provided as part of the standard.

    ASTM Standards

    D1193 Specification for Reagent Water

    UNSPSC Code

    UNSPSC Code 12161900(Surfactants)

    Referencing This Standard
    Link Here
    Link to Active (This link will always route to the current Active version of the standard.)

    DOI: 10.1520/D3049-89R96E01

    Citation Format

    ASTM D3049-89(1996)e1, Standard Test Method for Synthetic Anionic Ingredient by Cationic Titration, ASTM International, West Conshohocken, PA, 1996,

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