Abstract
Nonylphenol (NP), the product of the non-ionic surfactant nonylpenol ethoxylate (NPEOs) through biodegradation, has been concerned because of its estrogenic properties and widespread contamination in water body and the other environmental media. It is needed to have a simple and accurate method for its determination. This study coupled with solid-phase microextraction (SPME) and gas chromatography-mass spectrometry for analysis of nonylphenol in water. The headspace extraction with 50/30 mm divinylbenzene-carboxen-polydimethylsiloxane fiber of SPME first and followed by analysis of gas chromatography-mass spectrometry was conducted. After salting and pH adjustment, the effects due to the parameters of concentration of nonylphenol, temperature, stirring rate, equilibrium time and extraction time were observed upon the experimental design of Taguchi approach. Thus, the optimum conditions were suggested. The results show that the amount of nonylphenol collected on the selected fiber was correlated with the concentration of nonylphenol, temperature, stirring rate, equilibrium time and extraction time. The two predominant contributors to variation were the concentration of nonylphenol (37.52%) and temperature (24.24%). The proposed optimum conditions were 5 minutes for equilibrium , 30 minutes for extraction at 65℃ and stirring at 600 rpm. Upon this optimum conditions, the method detection limit was 6.75 mg/L when it was applied on a field sample from Danshui River.
Published Version
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