Polyol-enhanced dispersive liquid-liquid microextraction coupled with gas chromatography and nitrogen phosphorous detection for the determination of organophosphorus pesticides from aqueous samples, fruit juices, and vegetables
Polyol-enhanced dispersive liquid-liquid microextraction coupled with gas chromatography and nitrogen phosphorous detection for the determination of organophosphorus pesticides from aqueous samples, fruit juices, and vegetables
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DOI：
10.1002/jssc.201500525
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发表时间：
2015-12-01
影响因子：
3.1
通讯作者：
Nabil, Ali Akbar Alizadeh
中科院分区：
文献类型：
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作者：
Farajzadeh, Mir Ali;Mogaddam, Mohammad Reza Afshar;Nabil, Ali Akbar Alizadeh
提出了一种多元醇强化分散液-液微萃取技术，用于从不同样品中提取和预富集有机磷农药。在本研究中，制备了大量含有多元醇(山梨醇)的水相，然后将分散剂溶剂和萃取剂快速注入其中。山梨醇的萃取效果最好，与无机盐如氯化钠、氯化钾和硫酸钠相比，山梨醇对分析物的萃取回收率更高。在最佳提取条件下，方法的检出限和定量限分别在12-56和44-162 pg/mL范围内。浓缩倍数为2799~3033，萃取回收率为84~92%。方法精密度为10 ng/mL，日内(n=6)和日间(n=4)的相对标准偏差分别小于5.9%和7.8%。最后，用所提出的方法成功地分析了一些水样，并测定了四种分析物(二氮磷、乐果、毒死蜱和硫磷)，其中一些检测到了ng/mL的水平。
Polyol-enhanced dispersive liquid-liquid microextraction has been proposed for the extraction and preconcentration of some organophosphorus pesticides from different samples. In the present study, a high volume of an aqueous phase containing a polyol (sorbitol) is prepared and then a disperser solvent along with an extraction solvent is rapidly injected into it. Sorbitol showed the best results and it was more effective on the extraction recoveries of the analytes than inorganic salts such as sodium chloride, potassium chloride, and sodium sulfate. Under the optimum extraction conditions, the method showed low limits of detection and quantification within the ranges of 12-56 and 44-162 pg/mL, respectively. Enrichment factors and extraction recoveries were in the ranges of 2799-3033 and 84-92%, respectively. The method precision was evaluated at a concentration of 10 ng/mL of each analyte, and relative standard deviations were found to be less than 5.9% for intraday (n = 6) and less than 7.8% for interday (n = 4). Finally, some aqueous samples were successfully analyzed using the proposed method and four analytes (diazinon, dimethoate, chlorpyrifos, and phosalone) were determined, some of them at ng/mL level.