首页> 外文期刊>International journal of environmental analytical chemistry >Key factors in electromembrane microextraction systems for metals analysis in natural waters
【24h】

Key factors in electromembrane microextraction systems for metals analysis in natural waters

机译:天然水中金属膜电膜微萃取系统中的关键因素

获取原文
获取原文并翻译 | 示例
           

摘要

Application of an electric potential to hollow fibre liquid phase microextraction (HF-LPME) systems previously optimised for metals preconcentration from natural waters could improve their analytical performance increasing enrichment factors and reducing operation times. Nevertheless, the effectiveness of the direct application of an electric potential to these systems may be limited due to the effects produced by other operational parameters. In this work, the effect of a variable electric potential on the enrichment factors of four HF-LPME systems used for the analysis of trace metals in natural waters (Cd, Ni, Ag and Cu) has been studied. In addition, the effect of organic phase composition, distance between electrodes and electrodes diameter has been also studied. From the results obtained, composition of organic phase can be considered as the key factor in electromembrane (EME) systems, since its polarity determine the operational range of the applied electric potential and consequently the enrichment factor that could be achieved. EMEs have demonstrated to be a real alternative to preconcentrate Cd, Ag and Cu from natural water samples in very short times (30 min). In fact, enrichment factors increased up to one order of magnitude if compared with HF-LPME methodology without application of an electrical potential.
机译:在先前针对天然水中金属的预富集进行了优化的中空纤维液相微萃取(HF-LPME)系统上施加电势可以改善其分析性能,从而增加富集因子并减少操作时间。然而,由于其他操作参数产生的影响,直接将电势施加到这些系统的有效性可能受到限制。在这项工作中,研究了可变电势对用于分析天然水中痕量金属(镉,镍,银和铜)的四种HF-LPME系统的富集因子的影响。另外,还研究了有机相组成,电极间距离和电极直径的影响。从获得的结果来看,有机相的组成可以被认为是电膜(EME)系统中的关键因素,因为其极性决定了施加电势的操作范围,因此决定了可以实现的富集系数。事实证明,EME是在非常短的时间内(30分钟)从天然水样品中预浓缩Cd,Ag和Cu的真正替代方法。实际上,如果与不施加电位的HF-LPME方法相比,富集因子最多增加一个数量级。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱:kefu@zhangqiaokeyan.com

京公网安备:11010802029741号 ICP备案号:京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有
  • 客服微信

  • 服务号