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首页> 外文期刊>American Journal of Analytical Chemistry >An Electrochemical Understanding of Extraction of Silver Picrate by Benzo-3m-Crown-m Ethers (m = 5, 6) into 1,2-Dichloroethane and Dichloromethane
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An Electrochemical Understanding of Extraction of Silver Picrate by Benzo-3m-Crown-m Ethers (m = 5, 6) into 1,2-Dichloroethane and Dichloromethane

机译：Benzo-3m-Crown-m醚（m = 5，6）萃取1,2，二氯乙烷和二氯甲烷中的苦味酸银的电化学理解

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摘要

Two extraction constants (Kex± and Kex) for extraction of silver picrate (Ag﹢Pic﹣) by benzo-15-crown-5 ether (B15C5) and benzo-18-crown-6 one (B18C6) into 1,2-dichloroethane (DCE) and dichloromethane (DCM) were determined at 298 K and given values of ionic strength. Here, Kex± and Kex were expressed as [AgL﹢]o[Pic﹣]o/[Ag﹢][L]o[Pic﹣] and [AgLPic]o/[Ag﹢][L]o[Pic﹣], respectively: L symbolizes B15C5 or B18C6 and the subscript “o” denotes the organic phase composed of DCE or DCM. Individual distribution constants (KD,Pic) of picrate ion, Pic﹣, into the two diluents were also determined with the determination of Kex. From comparison of these KD,Pic values with those standardized, interfacial potential differences () at extraction equilibria were evaluated. Then, using these values, relations of the experimentally-determined logKex± or logKex values with their electrochemically-standardized ones were precisely discussed. Consequently, it was indicated that logKex± should be expressed as a function of .
机译：苯并15冠5醚（B15C5）和苯并18冠6甲（B18C6）分别将1,2,2-二氯乙烷萃取苦味酸银（Ag ﹢ Pic﹣）的两个萃取常数（Kex±和Kex）。 （DCE）和二氯甲烷（DCM）在298 K下测定，并给出离子强度值。这里，Kex±和Kex表示为[AgL ﹢] o [Pic﹣] o / [Ag ﹢] [L] o [Pic﹣]和[AgLPic] o / [Ag ﹢] [L] o [Pic﹣] ：L分别表示B15C5或B18C6，下标“ o”表示由DCE或DCM组成的有机相。用Kex的测定还确定了苦味离子Pic﹣在两种稀释剂中的各个分布常数（KD，Pic）。通过比较这些KD，Pic值与那些标准化的萃取平衡时的界面电位差（）。然后，使用这些值，精确讨论了实验确定的logKex±或logKex值与其电化学标准化值之间的关系。因此，表明logKex±应表示为的函数。

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