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Abstract
An analytical method based on extraction or on‐line preconcentration procedures followed by reversed‐phase HPLC and UV diode‐array detection has been developed and evaluated for trace phthalate esters (PAEs). With the aid of gradient elution and programmed eluent flow rates, eleven phthalate esters can be separated and determined within 32 minutes of retention. Precision of retention for qualitative purpose is less than 0.3%. Without preconcentration, detection limits for the studied PAEs range from 0.06 to 0.53 ppm. Lower detection limits can be achieved with off‐line extraction or on‐line preconcentration procedures without significant loss of resolution and precision. However, better recovery is obtained from the use of off‐line technique. The method is used to monitor the content of PAEs in river water and polystyrene foam leached with hot water.
