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首页> 外文期刊>Analytica chimica acta >Reversed-phase chromatomembrane extraction as a novel approach for automated sample pretreatment: Anions determination in biodiesel by ion chromatography with conductivity detection
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Reversed-phase chromatomembrane extraction as a novel approach for automated sample pretreatment: Anions determination in biodiesel by ion chromatography with conductivity detection

机译：反相色母膜萃取作为自动样品预处理的新方法：通过电导检测通过离子色谱法测定生物柴油中的测定

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摘要

In this study, a reversed-phase chromatomembrane extraction (RP-CME) method as a novel approach for automated sample pretreatment was suggested for the first time. The RP-CME was applied to automated separation of anions (formate, chloride, nitrate, phosphate and sulfate) from biodiesel samples as a proof-of-concept example. The novel design of chromatomembrane cell was developed for on-line RPCME. The RP-CME procedure assumed mass-transfer of water-soluble analytes from organic sample phase (biodiesel sample) to aqueous phase supported in a porous composite mass-transfer block. The composite mass-transfer block based on microporous hydrophobic poly (tetrafluoroethylene) and hydrophilic glass fiber was developed for the RP-CME implementation. The block provided the effective retention of aqueous phase into the cell and simultaneous penetration of organic phase. The hydrophilic membrane-based sheet was used for the on-line separation of hydrophilic emulsion (biodiesel in water) containing target analytes obtained during analytes elution by aqueous phase from the mass-transfer block. The RP-CME was successfully coupled with an ion chromatography with conductivity detection. The limits of detection, calculated from a blank test based on 3 sigma, were 5 mu g kg(-1) for sulfate, 6 mu g kg(-1) for nitrate, 3 mu g kg(-1) for chloride, 5 mu g kg(-1) for phosphate and 1 mu g kg(-1) for formate. (C) 2019 Elsevier B.V. All rights reserved.
机译：在该研究中，第一次提出了一种作为一种自动样品预处理的新方法的反相色母膜萃取（RP-CME）方法。将RP-CME应用于从生物柴油样本中自动分离生物柴油样本作为概念验证实例。为在线RPCME开发了色疱疹细胞的新颖设计。 RP-CME程序假定从有机样品相（生物柴油样品）中的水溶性分析物的质量转移到多孔复合物块转移块中负载的水相中。基于微孔疏水聚（四氟乙烯）和亲水性玻璃纤维的复合传质块用于RP-CME实施。该块提供了水相的有效保留到细胞中并同时渗透有机相。基于亲水膜的片材用于通过来自传质嵌段的水相洗脱的分析物洗脱期间获得的靶分析物的亲水性乳液（水中的生物柴油）的在线分离。 RP-CME成功与具有电导检测的离子色谱相偶联。从基于3 sigma的空白试验计算的检测限为5μgkg（-1）硫酸盐，6μggkg（-1）用于硝酸，3μggkg（-1）氯化物，5用于磷酸盐和1μgkg（-1）的mu g kg（-1）。 （c）2019年Elsevier B.V.保留所有权利。

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