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Electric Field-Driven Extraction of Lipophilic Anions across a Carrier-Mediated Polymer Inclusion Membrane

机译:电场驱动的跨载流子介导的聚合物包裹体膜的亲脂性阴离子的萃取

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The use of a cationic carrier-mediated polymer inclusion membrane (PIM) for extraction and preconcentration of anionic model analytes driven by an electric field directly into an aqueous acceptor solution is demonstrated. The optimized membrane was 20(mu)m thick and consisted of 60percent cellulose triacetate as base polymer, 20percent o-nitrophenyl octyl ether as plasticizer, and 20percent Aliquat 336 as cationic carrier in the perchlorate form. By applying voltages of up to 700 V across the membrane, the lipophilic model analytes propanesulfonate, octanesulfonate, and decanesulfonate could be transported from the aqueous donor solution to the aqueous acceptor solution with efficiences >90percent within 5 to 20 min. A preconcentration factor of 26, defined by the volume ratio between donor and acceptor compartments of the current cell design, could be achieved. The utility of the method for analytical applications is demonstrated by extraction of the herbicide glyphosate and its breakdown product aminomethylphosphonic acid from spiked river water, followed by quantification with capillary electrophoresis using contactless conductivity detection. Limits of detection of 0.8 and 1.5 ng/mL were obtained for glyphosate and aminomethylphosphonic acid, respectively.
机译:证明了使用阳离子载体介导的聚合物包含膜(PIM)来提取和预浓缩由电场驱动的阴离子模型分析物直接进入受体水溶液中的过程。优化的膜厚20μm,由60%的三乙酸纤维素作为基础聚合物,20%的邻硝基苯基辛基醚作为增塑剂和20%的Aliquat 336作为高氯酸盐形式的阳离子载体组成。通过在膜上施加高达700 V的电压,亲脂性模型分析物丙磺酸盐,辛烷磺酸盐和癸烷磺酸盐可以在5至20分钟内从供体水溶液传输到受体水溶液,效率> 90%。可以达到26的预浓缩系数,该系数由当前电池设计的供体和受体隔室之间的体积比定义。该方法用于分析应用的实用性可通过从加标的河水中提取除草剂草甘膦及其分解产物氨基甲基膦酸,然后通过使用非接触电导检测的毛细管电泳进行定量。草甘膦和氨基甲基膦酸的检出限分别为0.8和1.5 ng / mL。

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