Liquid Chromatographic Separation and Determination of Aromatic Sulfonates in an Aquatic Environment Using a Photodiode Array and Electrospray Ionization-Mass Spectrometer as Detectors

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A simple and rapid method involving high-performance liquid chromatographic separation, followed by photodiode array (PDA) and electrospray ionization-mass spectrometric (ESI-MS) detection of aromatic sulfonates in waste-water effluents of industrial units producing optical whitening agents, has been developed. The separation was achieved on a reversed-phase Hypersil C₁₈ column using gradient elution of a mobile phase consisting of 0.05 M ammonium formate-methanol with decreasing concentration of the buffer at room temperature. The minimum detection limits were determined to be in the range of 0.2 - 1.8 × 10^-9 g using PDA and ESI-MS detectors.