Determination of Naphthalenesul-Phonates in Water by On-Line Ion-Pair Solid-Phase Extraction and Ion-Pair Liquid Chromatography with Diode-Array UV Detection

Abstract
Ion-pair solid-phase extraction was on-line coupled to a chromatographic system with a PLRP-s precolumn and the results were compared with those obtained when C18 sorbents are used. After optimization, the method was used to determine these compounds in two river waters. A sample of 20 ml of river water was preconcentrated with good recovery values for all the compounds studied and detected at 220 nm with detection limits between 0.25 and 0.1 μ1−1. Some of the compounds were provisionally determined by diode-array UV detection.

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