ASTM-D3049 Standard Test Method for Synthetic Anionic Ingredient by Cationic Titration

ASTM-D3049 - 1989 R16 EDITION - CURRENT
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Standard Test Method for Synthetic Anionic Ingredient by Cationic Titration
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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, alkylphenol- and fatty alcohol ethoxy-sulfates and dialkylsulfosuccinates. 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 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.

1.5 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.

Keywords

anionic surfactants; cationic titrations; two-phase titrations ;; ICS Number Code 71.100.40 (Surface active agents)

To find similar documents by ASTM Volume:

15.04 (Soaps and Other Detergents; Polishes; Leather; Resilient Floor Coverings)

To find similar documents by classification:

71.100.40 (Surface active agents)

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Document Number

ASTM-D3049-89(2016)

Revision Level

1989 R16 EDITION

Status

Current

Modification Type

Reapproval

Publication Date

Aug. 15, 2016

Document Type

Test Method

Page Count

5 pages

Committee Number

D12.12