Abstract

Low density ionic liquid-based ultrasound-assisted dispersive liquid−liquid microextraction for the preconcentration of aromatic amines in river waters and wastewater before HPLC-UV analysis was studied. In the proposed method, the ionic liquid, trihexyl(tetradecyl)phosphonium bis(2,4,4-trimethylpentyl) phosphinate, was used as a low density extractant, and ultrasound was used as an efficient dispersing agent. After dispersion, the phases were separated by centrifugation. Next, the low density extractant phase floating on the surface was taken with a microsyringe and was dissolved in a small volume of methanol before chromatographic analysis. The limits of detection were 0.09 ng/mL for 4-toluidine, 0.12 ng/mL for 2,4-dichloroaniline and 0.07 ng/mL for 4-chloroaniline. The accuracy of this method was evaluated by preconcentration and determination of aromatic amines in wastewater and river waters with the recovery values in the range of 81.7–94.9% and precision of 2.8–6.0%.

中文翻译：

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用于预浓缩水中痕量芳香胺的低密度离子液体超声辅助分散液-液体微萃取

摘要

在研究 HPLC-UV 分析之前，基于低密度离子液体的超声辅助分散液-液微萃取用于预浓缩河水和废水中的芳香胺。在所提出的方法中，离子液体三己基（十四烷基）膦双（2,4,4-三甲基戊基）次膦酸盐用作低密度萃取剂，超声波用作有效分散剂。分散后，通过离心分离各相。接下来，用微量注射器取出漂浮在表面上的低密度萃取相，并在色谱分析前溶解在少量甲醇中。4-甲苯胺的检测限为 0.09 ng/mL，2,4-二氯苯胺的检测限为 0.12 ng/mL，4-氯苯胺的检测限为 0.07 ng/mL。