Ultra-Preconcentration and Determination of Multiple Pesticide Residues in Water Samples Using Ultrasound-Assisted Dispersive Liquid-Liquid Microextraction and GC-FID

作者：Cui Shumin; Chen Qianxia; Wang Weiping^*; Miao Jigen; Wang Aijun; Chen Jianrong

来源：Chromatographia, 2013, 76(11-12): 671-678.

DOI：10.1007/s10337-013-2441-7

• Gas chromatography-flame ionization detection
• Ultrasonic-assisted dispersive liquid-liquid microextraction
• Pesticide residues

In this study, a simple and efficient method has been developed to analyze pesticides in water samples using ultrasonic-assisted dispersive liquid-liquid microextraction (UA-DLLME) combined with gas chromatography-flame ionization detection (GC-FID). Several parameters, including type and volume of extractant and dispersant, extraction time, and amount of salt on extraction performance, were optimized in detail. A mixture of acetonitrile (1.0 mL, dispersant) and carbon tetrachloride (15 mu L, extractant) was used for extraction. Under optimal conditions, enrichment factors were obtained between 315 and 1153. The linearity of the method ranged from 1 to 100 mu g L-1 with correlation coefficients >= 0.9990. Limits of detection (S/N = 3) ranged between 0.09 and 0.57 mu g L-1, depending on the compounds. Relative standard deviations were <8.0 % (n = 5) for both intra- and inter-day analyses. The proposed method was successfully applied for the preconcentration and determination of pesticides in water samples (river water, tap water, and lake water) with recoveries that varied from 90.5 to 107.7 %.

• 出版日期2013-6
• 单位浙江师范大学