Hristov Danail Georgiev, Milcheva Nikolina Petkova, Gavazov Kiril Blazhev
Acta Chim Slov. 2019 Dec;66(4):987-994.
Liquid-liquid extraction-chromogenic systems for vanadium(V) based on xylometazoline hydrochloride (XMZ) and azo derivatives of resorcinol (ADRs) were studied. The following ADRs were used: 4-(2-thiazolylazo)resorcinol (TAR), 5-methyl-4-(2-thiazolylazo)resorcinol (MTAR), and 6-hexyl-4-(2-thiazolylazo)resorcinol (HTAR). Concentration of the reagents, pH of the aqueous medium and shaking time were subjects of optimization experiments. The chloroform-extracted ternary complexes were of composition 1:1:1. The molar absorptivity coefficients (el), absorption maxima (l), constants of extraction (Log K), and fractions extracted (E%) were found to be e553 = 2.50 ´ 104 dm3 mol-1 cm-1, Log K = 3.5, and E = 96% (ADR = TAR); e550 = 1.88 ´ 104 dm3 mol-1 cm-1, Log K = 3.4, and E = 98% (ADR = MTAR); and e554 = 2.62 ´ 104 dm3 mol-1 cm-1, Log K = 5.0, and E = 99.5% (ADR = HTAR). The Sandell's sensitivities and Beer's law limits were determined as well.
研究了基于盐酸赛洛唑啉（XMZ）和间苯二酚偶氮衍生物（ADRs）的钒（V）液-液萃取显色体系。使用了以下ADRs：4-（2-噻唑基偶氮）间苯二酚（TAR）、5-甲基-4-（2-噻唑基偶氮）间苯二酚（MTAR）和6-己基-4-（2-噻唑基偶氮）间苯二酚（HTAR）。试剂浓度、水相介质的pH值和振荡时间是优化实验的对象。氯仿萃取的三元配合物的组成是1:1:1。发现摩尔吸光系数（el）、最大吸收波长（l）、萃取常数（Log K）和萃取率（E%）分别为：e553 = 2.50×104 dm3 mol-1 cm-1，Log K = 3.5，E = 96%（ADR = TAR）；e550 = 1.88×104 dm3 mol-1 cm-1，Log K = 3.4，E = 98%（ADR = MTAR）；e554 = 2.62×104 dm3 mol-1 cm-1，Log K = 5.0，E = 99.5%（ADR = HTAR）。还测定了桑德尔灵敏度和比尔定律范围。
