Selective silver ion transfer voltammetry at the polarised liquid/liquid interface.
Selective silver ion transfer voltammetry at the polarised liquid/liquid interface.
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极化液/液界面的选择性银离子转移伏安法。
DOI：
10.1039/b301832f
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发表时间：
2003
期刊：
影响因子：
--
通讯作者：
R. Dryfe
中科院分区：
文献类型：
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作者：
Amanda Sherburn;Mark Plattt;D. Arrigan;N. Boag;R. Dryfe
用循环伏安法（CV）研究了银离子在水/1,2-二氯乙烷界面上的转移。在没有添加中性离子载体的情况下，当有机相中含有四苯基硼酸盐或四（4-氯）苯基硼酸盐阴离子时，Ag+在界面上转移，但在有机相中含有六氟磷酸盐或高氯酸盐阴离子时，这种转移是不可能的。观察到的离子转移过程与有机相阳离子的性质无关。四苯基硼酸盐存在时，CV呈现出与离子转移后的化学反应相一致的形状；反应速率常数为0.016 s（-1）。在四（4-氯）苯硼酸盐存在下，观察到一个与正向峰大小相等的返回峰，表明这是一个简单的离子转移反应，没有伴随的化学反应。对其他金属阳离子转移的选择性进行了评估：未观察到铜、镉、铅、铋、钴、镍、钯或锌的转移。转移的选择性表明，这可以形成选择性伏安法测定银离子的基础。
Transfer of silver ions across the water/1,2-dichloroethane interface was studied by cyclic voltammetry (CV). In the absence of added neutral ionophore, Ag+ transferred across the interface when the organic phase contained either tetraphenylborate or tetrakis(4-chloro)phenylborate anions, but this transfer was not possible in the presence of organic phase hexafluorophosphate or perchlorate anions. The ion transfer processes observed were independent of the nature of the organic phase cation. The CV in the presence of tetraphenylborate exhibited a shape consistent with an ion transfer followed by chemical reaction; the rate constant for the following chemical reaction was 0.016 s(-1). In the presence of tetrakis(4-chloro)phenylborate, a return peak equivalent in magnitude to the forward peak was observed, indicative of a simple ion transfer reaction uncomplicated by accompanying chemical reactions. The selectivity of the transfer was assessed with respect to other metal cations: no transfers for copper, cadmium, lead, bismuth, cobalt, nickel, palladium or zinc were observed. The selectivity of the transfer suggests this can form the basis of a selective voltammetric methodology for the determination of silver ions.