Abstract
A fast and reliable high-performance liquid chromatographic method has been elaborated for the separation and quantitative determination of long-chain alkyltrimethylammonium ions. The separation was achieved on a Nucleosil CN column with methanol-water (55:45) containing 5 m M p-toluenesulphonic acid as the eluent. UV detection at 254 nm was possible owing to the added p-toluenesulphonic acid. The influence of various types of chemically bonded phases on the efficiency of the separation has been investigated and the more polar types such as bonded phenyl and bonded cyanopropyl were found to cause a better peak shape than bonded C 8 or C 18 alkyl chains. Furthermore, it was found that p-toluenesulphonate as the counter ion relative to 2-naphthalenesulphonate resulted in a better peak shape, albeit with a lower response. Mixtures of homologous alkyltrimethylammonium bromides, including the widely used disinfectant cetrimide, have been analysed.
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