Determination of Dialkyl Di-Methyl Quaternary Ammonium Salts in Fabric Softener According to ASTM D5070

Fabric softener contains quaternary ammonium salts as its active ingredient, and therefore its cost and performance are evaluated by accurately measuring the amount of these salts. This article describes one method of using back titration to determine the amount of dialkyl dimethyl quaternary ammonium salts.

Sample

Fabric Softener

Sample Preparation

For this titration, 1.8 g of sample is weighed accurately and dissolved in 200 mL isopropanol.

Configuration

Solutions

Analysis of Samples

2 mL of the sample is pipetted into a 250 mL beaker followed by the addition of 5 mL isopropanol. Once it is fully dissolved, 150 mL of deionized water and 4 mL of borate buffer solution are added. 10 mL c(SDS), or 0.004 mol/L, is then added to the solution. Finally, the solution is titrated with c(Hyamine) at 0.004 moL/L until the equivalence point is passed.

Parameters


Results

This information has been sourced, reviewed and adapted from materials provided by Metrohm AG.

For more information on this source, please visit Metrohm AG.

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