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http://dx.doi.org/10.5012/bkcs.2004.25.1.059

Tetrahydrofuran-Containing Crown Ethers as Ionophores for NH+4-Selective Electrodes  

Jin, Hua-Yan (Department of Chemistry and Research Institute of Natural Sciences, Gyeongsang National University)
Kim, Tae-Ho (Department of Chemistry and Research Institute of Natural Sciences, Gyeongsang National University)
Kim, Jin-Eun (Department of Chemistry and Research Institute of Natural Sciences, Gyeongsang National University)
Lee, Shim-Sung (Department of Chemistry and Research Institute of Natural Sciences, Gyeongsang National UniversityDepartment of Chemistry and Research Institute of Natural Sciences, Gyeongsang National University)
Kim, Jae-Sang (Department of Chemistry and Research Institute of Natural Sciences, Gyeongsang National University)
Publication Information
Bulletin of the Korean Chemical Society / v.25, no.1, 2004 , pp. 59-62 More about this Journal
Abstract
The ammonium ion-selective electrodes ($NH^+_4$-ISEs) based on the tetrahydrofuran(THF)-containing-16-crown-4 derivatives,1,4,6,9,11,14,16,19-tetraoxocycloeicosane ($L^1$) and 5,10,15,20,-tetramethyl-1,4,6,9,11,14,16,19-tetraoxocycloeicosane ($L^2$), were prepared and the electrode characteristics were tested. The conditioned $NH_4^+$-ISEs (E1) based on $L^1$ with TEHP as a plasticising solvent mediator gave best results with near-Nernstian slope of 53.9 mV/decade of activity, detection limit of $10^{-4.9}$ M, and enhanced selectivity coefficients for the $NH^+_4$ ion with respect to an interfering $K^+$ ion (log $K^{pot}_{NH_4^+,K^+}$ = -1.84). This result was compared to other ammonium ionophores reported previously, for example, that of nonactin (log $K^{pot}_{NH_4^+,K^+}$ = -0.92). The proposed electrode showed no significant potential changes in the range of 3.0 < pH < 9.0.
Keywords
Ammonium ionophore; on-selective PVC membrane electrodes; THF-containing crown ethers; Nonactin;
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