Determination of anionactive tensides using cetylpyridinium tetrachlorozincate as titrant. Analytical methods in respect to environmental and economical concern, part 20.
Sodium lauryl sulphate (sodium dodecylsulphate) can be determined in aqueous medium using cetylpyridinium tetrachlorozincate as standard solution and methyl orange resp. bromophenol blue as indicator. However, the determination of cetostearyl sulphate is problematic due to its slight solubility in cold water. Therefore, the titration has to be performed in warm solution. As well with methyl orange as with bromophenol blue the change of the indicator has to be titrated to colour shade. A photometric detection is recommended. The visual indication concerning the determination of the content of the technical solutions of the secondary paraffin sulphonates such as Ateban TH liquid and Marlon PS 30 is also critical.
Hilp
M
M
Institut für Pharmazeutische Chemie der Philipps-Universität, Marburg, Germany. manfred@hilp.de
D000476:Alkanesulfonates / Q000737:chemistry; D002594:Cetylpyridinium / Q000737:chemistry*; D004396:Coloring Agents; D005233:Fatty Alcohols; D007202:Indicators and Reagents; D010783:Photometry; D012015:Reference Standards; D012967:Sodium Dodecyl Sulfate / Q000737:chemistry; D013501:Surface-Active Agents / Q000032:analysis*
D000476:Alkanesulfonates; D004396:Coloring Agents; D005233:Fatty Alcohols; D007202:Indicators and Reagents; D013501:Surface-Active Agents; C010405:cetostearyl alcohol; D012967:Sodium Dodecyl Sulfate; D002594:Cetylpyridinium