Jin Quan, Kudo Yoshihiro
Graduate School of Science and Engineering, Chiba University, Chiba, 263-8522, Japan.
Anal Sci. 2022 May;38(5):803-811. doi: 10.1007/s44211-022-00099-2. Epub 2022 Mar 25.
Cd(II) picrate was extracted at 298 K into benzene (Bz) using benzo-18-crown-6 ether (B18C6) under the presence of HNO in water (w) phases. Extraction constants, such as K, K, and K, and a conditional distribution constant (K) of A = Pic were determined, where their extraction and distribution constants were defined as [CdLA]/P, [CdLA][A]/P, and CdL/P with P = [Cd][L][A] at L = B18C6 and [A]/[A], respectively. A [HNO] dependence of log K was discussed, while ionic strength dependences of log K and log K were done. Here, [HNO] denotes a total concentration of HNO added to the w phases. Also, among the eight conditions of [HNO], comparing K with an experimental distribution ratio of Cd(II) indicated that the K values do not function as a measure for extraction ability of L to the present systems. Moreover, the composition of Cd(II): Pic(-I) in the extracted species was shown by changing [HNO].
在水相存在硝酸的条件下，于298 K温度下使用苯并-18-冠-6醚（B18C6）将苦味酸镉（Cd(II) picrate）萃取到苯（Bz）中。测定了萃取常数，如K、K和K，以及A = 苦味酸根（Pic）的条件分布常数（K），其中它们的萃取和分布常数分别定义为[CdLA]/P、[CdLA][A]/P和CdL/P，在L = B18C6时P = [Cd][L][A]以及分别为[A]/[A]。讨论了log K对[HNO]的依赖性，同时研究了log K和log K对离子强度的依赖性。这里，[HNO]表示添加到水相中的HNO的总浓度。此外，在[HNO]的八个条件中，将K与Cd(II)的实验分布比进行比较表明，K值不能作为L对当前体系萃取能力的衡量标准。而且，通过改变[HNO]显示了被萃取物种中Cd(II):苦味酸根（Pic(-I)）的组成。
