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1-Butyl-3-methylimidazolium hexafluorophosphate ionic liquid-based liquid–liquid microextraction for the determination of 4-nonylphenol and 4- tert -octylphenol in environmental waters

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In the present study, room-temperature ionic liquid (RTIL) 1-butyl-3-methylimidazolium hexafluorophosphate was used as extraction solvent in a liquid–liquid microextraction (LLME) procedure followed by liquid chromatography for determining 4-nonylphenol (4-NP) and 4- tert -octylphenol (4- t -OP) in environmental water samples. RTIL-based LLME was a simple, inexpensive, and fast sample preparation method, and its parameters such as extraction time, addition of salt, selection of phase ratio, and pH value were optimized. The optimized method had acceptable limits of detection (LOD) and a precision of 2µgL −1 and 8.1% for 4-NP and 0.6µgL −1 and 3.7% for 4- t -OP, respectively. The proposed method was successfully applied in river water and effluent from a sewage-treatment plant, and the recoveries spiked at 6µgL −1 and 25µgL −1 levels were in the range of 82–113%.
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Keywords: Liquid–liquid microextraction; Nonylphenol; Octylphenol; Room-temperature ionic liquid

Document Type: Research Article

Affiliations: College of Environmental Science & Engineering, Nankai University, Tianjin, 300071, China

Publication date: November 15, 2006

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