Improved detection limits and unbiased selectivity coefficients obtained by using ion-exchange resins in the inner reference solution of ion-selective polymeric membrane electrodes

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	Improved detection limits and unbiased selectivity coefficients obtained by using ion-exchange resins in the inner reference solution of ion-selective polymeric membrane electrodes
	Wei Qin ; Titus Zwickl ; Ernö Pretsch
发表期刊	Anal. Chem.
	2000-07-15
卷号	72 期号:14 页码:3236-3240
产权排序	ETH, Swiss Fed Inst Technol, Dept Organ Chem, CH-8092 Zurich, Switzerland
通讯作者	Pretsch, E (通讯作者),ETH, Swiss Fed Inst Technol, Dept Organ Chem, Univ Str 16, CH-8092 Zurich, Switzerland
英文摘要	By using a high concentration of an interfering ion and a low one of the primary ion in the inner reference solution of polymeric membrane ion-selective electrodes (ISEs), the lower detection limit may be improved and unbiased thermodynamic selectivity coefficients may be obtained. To this purpose, a cation-exchange resin is used here to keep the low concentration of the primary cation constant. Different compositions of the internal solution are required for obtaining optimal lower detection limits and unbiased selectivity coefficients. All ISEs studied here, i.e., for K⁺, Ca²⁺, and NH₄⁺, based on valinomycin, ETH 5234, and nonactin/monactin, respectively, show improved lower detection limits in the range of 10^-^7.6 (NH₄⁺) to 10^-^8.8 M (Ca²⁺). Nernstian responses and, therefore, unbiased selectivity coefficients are obtained with the K⁺-ISE for the discriminated ions, Na⁺, Mg²⁺, and Ca²⁺.
收录类别	SCI
语种	英语
文献类型	期刊论文
条目标识符	http://ir.yic.ac.cn/handle/133337/5164
专题	科研共享资源
推荐引用方式 GB/T 7714	Wei Qin,Titus Zwickl,Ernö Pretsch. Improved detection limits and unbiased selectivity coefficients obtained by using ion-exchange resins in the inner reference solution of ion-selective polymeric membrane electrodes[J]. Anal. Chem.,2000,72(14):3236-3240.
APA	Wei Qin,Titus Zwickl,&Ernö Pretsch.(2000).Improved detection limits and unbiased selectivity coefficients obtained by using ion-exchange resins in the inner reference solution of ion-selective polymeric membrane electrodes.Anal. Chem.,72(14),3236-3240.
MLA	Wei Qin,et al."Improved detection limits and unbiased selectivity coefficients obtained by using ion-exchange resins in the inner reference solution of ion-selective polymeric membrane electrodes".Anal. Chem. 72.14(2000):3236-3240.

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