Towards coupling dispersive liquid-liquid microextraction with hollow fibre liquid phase microextraction for extraction of organic pollutants of agricultural origin

Thabiso Letseka, Mosotho J. George
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引用次数: 17

Abstract

Liquid-based miniaturized techniques have received a lot of attention recently resulting in the development of the liquid phase microextraction (LPME) and dispersive liquid-liquid microextraction (DLLME) techniques each offering unique benefits over the other technique. Herein we report a combination of the two techniques for the extraction of hexestrol and atrazine from aqueous systems. The method sets off with the DLLME thereafter a hollow fibre filled with the organic solvent is introduced for the extraction of the pre-extracted analytes in the dispersed organic solvent. The method was modified further by introducing a second extracting solvent in place of the disperser solvent. Under the optimum conditions, namely, toluene in the acceptor phase, 1:1 chloroform:toluene (v/v) as a dispersed solvent, 15% NaCl, with the 15 min extraction time, the method achieved satisfactory enrichment factors (87- and 62-fold); sufficiently low detection limits of 0.018 μg/mL and 0.016 μg/mL using the flame ionization detector, while 0.072 and 0.063 ng/mL were obtained using single ion monitoring mass spectrometry detector, for atrazine and hexestrol, respectively; with sufficient linearity (R2 ≥ 0.9959). Although the compounds were not detected in the river water sample, satisfactory recoveries (111–115%) were achieved indicating the method did not suffer any negative matrix effect.

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分散液液微萃取与中空纤维液相微萃取耦合萃取农业有机污染物的研究
液相微萃取(LPME)和分散型液液微萃取(DLLME)技术的发展使得基于液体的微型化技术受到了广泛的关注,每种技术都有其独特的优势。本文报道了从水系统中提取己甾醇和阿特拉津的两种技术的结合。该方法由DLLME启动,然后引入填充有机溶剂的中空纤维,用于在分散的有机溶剂中提取预提取的分析物。通过引入第二种萃取溶剂代替分散剂溶剂,进一步改进了该方法。在最佳条件下,即以甲苯为受体相,以1:1氯仿:甲苯(v/v)为分散溶剂,NaCl浓度为15%,萃取时间为15 min,该方法获得了满意的富集系数(分别为87倍和62倍);火焰电离检测器对阿特拉津和己甾醇的检出限分别为0.018和0.016 μg/mL,而单离子监测质谱检测器对阿特拉津和己甾醇的检出限分别为0.072和0.063 ng/mL;具有充分的线性关系(R2≥0.9959)。虽然在河流水样中未检测到化合物,但回收率(111 ~ 115%)令人满意,表明该方法没有任何负基质效应。
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