Add time:09/03/2019         Source:sciencedirect.com

Industrial surfactants such as the sodium salt of naphthalenesulfonic acid, formaldehyde polymer are widely used in manufacturing for process control. These water-soluble materials are eliminated with the waste water. This necessitates sensitive and accurate determinations of surfactant concentration in effluents as a prerequisite for effective pollution abatement. Monitoring the concentration of these surfactants by conventional spectrophotometric tests which are currently in use is non-differentiating and subject to gross interferences by many sources. Alternatively, determination of the above surfactant by HPLC methods has not been effective at resolving the various ionic species found. This work describes the selective separation of anionic species by the suppression of the EOF through the judicious choice of a commercially available coated column which increases selectivity by eliminating neutrals and cations through a bi-directional separation system. This is a significant enhancement over traditional approaches like HPLC which observe all UV-absorbing components and interferences. This selectivity is superior to that of the UV methods generating comparatively equivalent CE results when no interferences are present, and more accurate CE results when interferences are present.

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