Separation and concentration of sulfonylurea herbicides in milk by ionic-liquid-based foam flotation solid-phase extraction.

Autor: Zhang L; College of Chemistry, Jilin University, Changchun, P.R. China.; College of Food, Heilongjiang Bayi Agricultural University, Xinfeng Lu 5, Daqing, P.R. China., Cao B; College of Chemistry, Jilin University, Changchun, P.R. China., Yao D; College of Food, Heilongjiang Bayi Agricultural University, Xinfeng Lu 5, Daqing, P.R. China., Yu R; Department of Computer application engineering, Daqing Vocational College, Huoju Lu, Daqing, P.R. China., Yu C; College of Food, Heilongjiang Bayi Agricultural University, Xinfeng Lu 5, Daqing, P.R. China., Zhang H; College of Chemistry, Jilin University, Changchun, P.R. China., Yu A; College of Chemistry, Jilin University, Changchun, P.R. China.
Jazyk: angličtina
Zdroj: Journal of separation science [J Sep Sci] 2015 May; Vol. 38 (10), pp. 1733-40. Date of Electronic Publication: 2015 Apr 02.
DOI: 10.1002/jssc.201401344
Abstrakt: The ultrasound-assisted ionic liquid foam flotation solid-phase extraction of sulfonylurea herbicides in milk was developed and validated. The proteins and lipids were isolated from the sample matrix by adding salt and adjusting the pH value. The target analytes eluted from the solid-phase extraction cartridge were determined by high-performance liquid chromatography. Some experimental parameters, including the pH value of sample solution, amount of NaCl, ionic liquid type, extraction time, flow rate of carrier gas, flotation time, and solid-phase extraction cartridge type were investigated and optimized. Under the optimized experimental conditions, the limits of detection for metsulfuron, pyrazosulfuron, chlorimuron-ethyl, and nicosulfuron were 1.3, 0.6, 0.7, and 1.1 μg/L, respectively. When the present method was applied to the analysis of milk samples the recoveries of the analytes ranged from 84.3 to 105.2% and relative standard deviations were >5.7%.
(© 2015 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.)
Databáze: MEDLINE
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