On-line ion pair solid-phase extraction of electrokinetic multicommutation for determination of trace anion surfactants in pond water [An article from: Analytica Chimica Acta]

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Description:
An electrokinetic multicommutation system is presented in this paper for the preconcentration and determination of trace anion surfactants of alkylbenzenesulfonate (ABS) in pond water, including electro-osmotic pumping, on-line ion pair solid-phase extraction (IP-SPE), bubble removing and directly spectrophotometric determination. Tetrabutylammonium bromide (TBAB) as an ion-pairing reagent was added into sample solutions to improve ABS retention on C"1"8 extraction column. Several extraction parameters, including the concentration of different eluents and ion-pairing reagents, the retention and elution flow rate, and the eluent volume, were discussed in detail. A homemade gas-liquid separator was employed to remove bubbles from the eluate flow before spectrophotometric detection. In this way, the bubble interference in coupling reversed-phase SPE with spectrophotometry can be eliminated. For 15ml sampling volume, the detection limit of ABS, relative standard deviation and preconcentration factor of the proposed method were 10ngml^-^1 (3@s, N=7), 3.7% (N=8), and 65, respectively.