Trace-Level Potentiometric Detection in the Presence of a High Electrolyte Background

	Trace-Level Potentiometric Detection in the Presence of a High Electrolyte Background
	Qin, Wei1 ; Liang, Rongning1,2 ; Fu, Xiuli 1; Wang, Qianwen 1; Yin, Tanji1 ; Song, Wenjing 1
发表期刊	ANALYTICAL CHEMISTRY
ISSN	0003-2700
	2012-12-18
卷号	84 期号:24 页码:10509-10513
关键词	Ion-selective Electrodes Sensitive Membrane Electrodes Lower Detection Limit Sensors Ionophores Coefficients Diffusion Samples
产权排序	[Qin, Wei; Liang, Rongning; Fu, Xiuli; Wang, Qianwen; Yin, Tanji; Song, Wenjing] Chinese Acad Sci, Shandong Prov Key Lab Coastal Zone Environm Proc, YICCAS, Key Lab Coastal Zone Environm Proc,Yantai Inst Co, Yantai 264003, Shandong, Peoples R China; [Liang, Rongning] Chinese Acad Sci, Grad Univ, Beijing 100049, Peoples R China
通讯作者	Qin, W (reprint author), Chinese Acad Sci, Shandong Prov Key Lab Coastal Zone Environm Proc, YICCAS, Key Lab Coastal Zone Environm Proc,Yantai Inst Co, Yantai 264003, Shandong, Peoples R China.
作者部门	中科院海岸带环境过程与生态修复重点实验室
英文摘要	Polymeric membrane ion-selective electrodes (ISEs) have become attractive tools for trace-level environmental and biological measurements. However, applications of such ISEs are often limited to measurements with low levels of electrolyte background. This paper describes an asymmetric membrane rotating ISE configuration for trace-level potentiometric detection with a high-interfering background. The membrane electrode is conditioned in a solution of interfering ions (e.g., Na+) so that no primary ions exist in the ISE membrane, thus avoiding the ion-exchange effect induced by high levels of interfering ones in the sample. When the electrode is in contact with the primary ions, the interfering ions in the membrane surface can be partially displaced by the primary ions due to the favorable ion ligand interaction with the ionophore in the membrane, thus causing a steady-state potential response. By using the asymmetric membrane with an ion exchanger loaded on the membrane surface, the diffusion of the primary ions from the organic boundary layer into the bulk of the membrane can be effectively blocked; on the other hand, rotation of the membrane electrode dramatically reduces the diffusion layer thickness of the aqueous phase and significantly promotes the mass transfer of the primary ions to the sample membrane interface. The induced accumulation of the primary ions in the membrane boundary layer largely enhances the nonequilibrium potential response. By using copper as a model, the new concept offers a subnanomolar detection limit for potentiometric measurements of heavy metals with a high electrolyte background of 0.5 M NaCl.; Polymeric membrane ion-selective electrodes (ISEs) have become attractive tools for trace-level environmental and biological measurements. However, applications of such ISEs are often limited to measurements with low levels of electrolyte background. This paper describes an asymmetric membrane rotating ISE configuration for trace-level potentiometric detection with a high-interfering background. The membrane electrode is conditioned in a solution of interfering ions (e.g., Na+) so that no primary ions exist in the ISE membrane, thus avoiding the ion-exchange effect induced by high levels of interfering ones in the sample. When the electrode is in contact with the primary ions, the interfering ions in the membrane surface can be partially displaced by the primary ions due to the favorable ion ligand interaction with the ionophore in the membrane, thus causing a steady-state potential response. By using the asymmetric membrane with an ion exchanger loaded on the membrane surface, the diffusion of the primary ions from the organic boundary layer into the bulk of the membrane can be effectively blocked; on the other hand, rotation of the membrane electrode dramatically reduces the diffusion layer thickness of the aqueous phase and significantly promotes the mass transfer of the primary ions to the sample membrane interface. The induced accumulation of the primary ions in the membrane boundary layer largely enhances the nonequilibrium potential response. By using copper as a model, the new concept offers a subnanomolar detection limit for potentiometric measurements of heavy metals with a high electrolyte background of 0.5 M NaCl.
文章类型	Article
资助机构	Instrument Developing Project of the Chinese Academy of Sciences [YZ201161]; National Natural Science Foundation of China [20977073, 41206087]; National 863 high technology Project of the Ministry of Science and Technology of China [2007AA09Z103]; Taishan Scholar Program of Shandong Province [TS20081159]
收录类别	SCI
语种	英语
关键词[WOS]	ION-SELECTIVE ELECTRODES ; SENSITIVE MEMBRANE ELECTRODES ; LOWER DETECTION LIMIT ; SENSORS ; IONOPHORES ; COEFFICIENTS ; DIFFUSION ; SAMPLES
研究领域[WOS]	Chemistry
WOS记录号	WOS:000312429800001
引用统计	被引频次：27[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.yic.ac.cn/handle/133337/6070
专题	中国科学院海岸带环境过程与生态修复重点实验室
作者单位	1.Chinese Acad Sci, Shandong Prov Key Lab Coastal Zone Environm Proc, YICCAS, Key Lab Coastal Zone Environm Proc,Yantai Inst Co, Yantai 264003, Shandong, Peoples R China 2.Chinese Acad Sci, Grad Univ, Beijing 100049, Peoples R China
推荐引用方式 GB/T 7714	Qin, Wei,Liang, Rongning,Fu, Xiuli,et al. Trace-Level Potentiometric Detection in the Presence of a High Electrolyte Background[J]. ANALYTICAL CHEMISTRY,2012,84(24):10509-10513.
APA	Qin, Wei,Liang, Rongning,Fu, Xiuli,Wang, Qianwen,Yin, Tanji,&Song, Wenjing.(2012).Trace-Level Potentiometric Detection in the Presence of a High Electrolyte Background.ANALYTICAL CHEMISTRY,84(24),10509-10513.
MLA	Qin, Wei,et al."Trace-Level Potentiometric Detection in the Presence of a High Electrolyte Background".ANALYTICAL CHEMISTRY 84.24(2012):10509-10513.

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