Acta Chim Slov. 2021 Mar;68(1):37-43.
The interaction between CoII and 5-methyl-4-(2-thiazolylazo)-resorcinol (MTAR) was studied in a water-chloroform system, in the presence or absence of benzalkonium chloride (BZC) as a cationic ion-association reagent. The optimum pH, concentration of the reagents and extraction time for the extraction of Co were found. In the presence of BZC, the extracted ion-associate could be represented by the formula (BZ+)[CoIII(MTAR2-)2], where MTAR is in its deprotonated form. The following extraction-spectrophotometric characteristics were determined: absorption maximum, molar absorptivity, Sandell's sensitivity, limit of detection, limit of quantification, constant of extraction, distribution ratio and fraction extracted. In the absence of BZC, the extraction is incomplete and occurs in a narrow pH range. The extracted chelate contains one deprotonated and one monoprotonated ligand: [CoIII(MTAR2-)(HMTAR-)].
在水-氯仿体系中，研究了 CoII 与 5-甲基-4-(2-噻唑偶氮)-间苯二酚（MTAR）之间的相互作用，存在或不存在苯扎氯铵（BZC）作为阳离子离子缔合试剂。发现了萃取 Co 的最佳 pH 值、试剂浓度和萃取时间。在 BZC 的存在下，萃取的离子缔合物可以表示为（BZ+）[CoIII（MTAR2-）2]，其中 MTAR 呈去质子化形式。确定了以下萃取分光光度特性：吸收最大值、摩尔吸光系数、桑德尔灵敏度、检测限、定量限、萃取常数、分配比和萃取分数。在没有 BZC 的情况下，萃取不完全，并且在较窄的 pH 范围内发生。所萃取的螯合物含有一个去质子化和一个单质子化配体：[CoIII（MTAR2-）（HMTAR-）]。
