Voltammetric Study of the Facilitated Transfer of Lead(II) Ion by Macrocyclic Polythiaether 1, 4, 7 10, 13, 16-Hexathiacyclooctadecane across the Polarizable Nitrobenzene/Water Interface
Voltammetric Study of the Facilitated Transfer of Lead(II) Ion by Macrocyclic Polythiaether 1, 4, 7 10, 13, 16-Hexathiacyclooctadecane across the Polarizable Nitrobenzene/Water Interface
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大环聚硫醚 1, 4, 7 10, 13, 16-Hexathiacyclooctadecane 促进铅 (II) 离子穿过可极化硝基苯/水界面转移的伏安研究
DOI：
10.2116/analsci.12.683
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发表时间：
1996
影响因子：
1.6
通讯作者：
M. Senda
中科院分区：
文献类型：
--
作者：
H. Katano;M. Senda
本文用离子转移伏安法研究了大环多硫醚对Pb^2+在硝基苯/水和1，2-二氯乙烷/水两种极化界面上的转移行为。研究了1，4，7，10，13，16-六硫杂环十八烷（HTCO）对Pb^2+离子的促进迁移作用。在硝基苯/水界面上的伏安波是由于可逆转移，并通过形成1：1（金属：离子载体）络合物（PbHTCO^2+）的辅助。随着乙酸根离子浓度的增加，Pb^2+易化迁移的半波电位向正电位移动。使用油/水界面可逆易化离子转移的半波电位理论方程，通过Pb^2+离子与醋酸根离子形成复合物来解释这一点。此外，随着油相中支持电解质浓度的增加，观察到的半波电位负移可归因于PbHTCO^2+与支持电解质阴离子的离子缔合。研究结果为Pb（II）的电化学测定提供了一种新的方法。
Facilitated transfer of Pb^2+ ion by macrocyclic polythiaethers across the polarizable nitrobenzene/water and 1, 2-dichloroethane/water interfaces has been studied by means of ion-transfer voltammetry. Well-defined voltammetric waves due to facilitated transfer of Pb^2+ ion by 1, 4, 7, 10, 13, 16-hexathiacyclooctadecane (HTCO) were observed. The voltammetric waves at the nitrobenzene/water interface are shown to be due to the reversible transfer, assisted by the formation of 1; 1 (metal: ionophore) complex (PbHTCO^2+). The half-wave potential of the facilitated transfer of Pb^2+ ion was shifted to more positive potential with increasing concentration of acetate ion in water phase. This is explained by the formation of complexes of Pb^2+ ion with acetate ion, using the theoretical equations of the half-wave potential of reversible facilitated ion-transfer across the oil/water interface. Also, the negative shift in the half-wave potential observed with increasing concentration of supporting electrolyte in oil phase can be attributed to the ionic association of PbHTCO^2+ with the supporting electrolyte anion. The results suggest a new electrochemical method for the determination of Pb(II).