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Naphthalenedlsulfon ate-acetonitrile as a mobHe phase alone with a crow United amine-fluorocarbon polymer suca column has shown to be an effective combination tor the separation of aliphatic anionic surfactants. Indirect conductivity and photometric detection modes are used to monitor these analytes. The retention of these surfactants Is found to depend on both the Ionic strength and the organic solvent content of the moMe phase. The mechanism of retention Is believed to be a combination of both reversed phase and Ion exchange processes. Selective separation of both C,-C12 alkanesulfonates and alkyl sulfates can be achieved In less than 9 min. Detection limits are as low as 5 ng for most analytes, with linear responses extending from at least 500 ppm to the sub-ppm level.

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