Combination of ultrasound-assisted ionic liquid dispersive liquid-phase microextraction and high performance liquid chromatography for the sensitive determination of benzoylureas pesticides in environmental water samples

• Published in: Journal of separation science Vol. 33; no. 23-24; pp. 3734 - 3740
• Main Authors: Zhou, Qingxiang, Zhang, Xiaoguo
• Format: Journal Article
• Language: English
• Published: Weinheim Wiley-VCH Verlag 01.12.2010; WILEY-VCH Verlag; WILEY‐VCH Verlag; Wiley
• Subjects: Analysis methods; Analytical chemistry; Applied sciences; Benzoylurea pesticides; Chemistry; Chromatographic methods and physical methods associated with chromatography; Chromatography, High Pressure Liquid - methods; Exact sciences and technology; Hydrogen-Ion Concentration; Ionic liquid; Ions; Limit of Detection; Natural water pollution; Other chromatographic methods; Pesticides - analysis; Pollution; Reproducibility of Results; Ultrasonics; Water Pollutants, Chemical - analysis; Water treatment and pollution; Chemical analysis; Insecticide; HPLC chromatography; Solvent extraction; Chemical enrichment; Ionic liquid; Dispersive liquid liquid microextraction; Chitin synthesis inhibitor; Freshwater environment; Ultrasound assisted extraction; Sample preparation; Reservoir water; Ureas; Ultrasound; Benzoylurea pesticides; Quantitative analysis; Trace analysis; Pesticides; Operating conditions; Reversed phase chromatography; Ultraviolet detector; Surface water; Lakes; Water pollution; River water
• ISSN: 1615-9306; 1615-9314; 1615-9314
• DOI: 10.1002/jssc.201000443

This paper describes a new method for rapid and sensitive determination of diflubenzuron, flufenoxuron, triflumuron and chlorfluazuron in water samples by ultrasound-assisted ionic liquid dispersive liquid-phase microextraction in combination with HPLC. Ionic liquid 1-hexyl-3-methylimidazolium hexafluorophosphate ([C₆MIM][PF₆]) was used as the extraction solvent for the enrichment of four benzoylurea (BU) pesticides. Factors such as volume of [C₆MIM][PF₆], sonication time, sample pH, extraction time, centrifuging time and salting-out effect were systematically investigated. Under the optimum conditions, an excellent linear relationship was achieved in the range of 1.0-100 μg/L. The detection limits varied from 0.21 to 0.45 μg/L and the precision of the method was below 6.9% (RSD, n=6). The proposed method was successfully applied for the determination of these BU pesticides in water samples and excellent spiked recoveries were achieved. All these results demonstrated that this procedure provided a new simple, rapid, easy to operate, efficient and sensitive method for the analysis of BU pesticides in aqueous samples.