Determination of triazine herbicides in fresh vegetables by dynamic microwave-assisted extraction coupled with homogeneous ionic liquid microextraction high performance liquid chromatography
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- 作者：Lijie Wu ; Mingzhu Hu ; Zhanchao Li ; Ying Song…
- 关键词：Dynamic microwave ; assisted extraction ; Homogeneous ionic liquid microextraction ; In ; situ metathesis reaction ; High ; performance liquid chromatography ; Triazine herbicides
- 刊名：Analytical and Bioanalytical Chemistry
- 出版年：2015
- 出版时间：February 2015
- 年：2015
- 卷：407
- 期：6
- 页码：1753-1762
- 全文大小：1,040 KB
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文摘
A novel extraction method, dynamic microwave-assisted extraction coupled with homogeneous ionic liquid microextraction, was developed for the determination of triazine herbicides, including desmetryn, terbumeton, propazine, terbuthylazine, dimethametryn, and dipropetryn in fresh vegetable samples by high performance liquid chromatography (HPLC). In the developed method, 120?μL of 1-butyl-3-methylimidazolium tetrafluoroborate ([C4MIM][BF4]) was added to 10?mL of aqueous solution containing 0.3?g of NaCl to obtained the extraction solvent. Six triazines could be extracted completely within 4?min by the present method. Then, [NH4][PF6] was added into the extract to form a water-insoluble ionic liquid [C4MIM][PF6] via a simple metathesis reaction, and the analytes were enriched into the ionic liquid phase. After centrifugation and dilution with acetonitrile, the resulting solution was analyzed directly by HPLC. The effects of some experimental parameters, including type and volume of ionic liquid, volume of extraction solvent, amount of ion-pairing agent [NH4][PF6], salt concentration, microwave power, and flow rate of extraction solvent on the extraction efficiency were investigated and optimized. Under the optimum experimental conditions, the linearity for determining the analytes was in the range of 2.50-50.00?μg?kg?, with the correlation coefficients ranging from 0.9989 to 0.9999. When the present method was applied to the analysis of vegetable samples, satisfactory recoveries were obtained in the range of 76.8?%-06.9?%, and relative standard deviations were lower than 9.8?%. Graphical Abstract Extraction procedure of triazines from vegetable sample