Abstract

Two liquid-liquid extraction-chromogenic systems for Ga^III based on azo dyes (ADs) and xylometazoline hydrochloride (XMH) have been studied. The ADs used were 4-(2-pyridylazo)resorcinol (PAR) and 4-(2-thiazolylazo)resorcinol (TAR). The optimum conditions (pH, AD concentration, XMH concentration, and extraction time) for the formation of ternary complexes of general formula (XMH⁺)[Ga^III(AD^2–)₂], that are readily extracted into chloroform, have been worked out. The following extraction-spectrophotometric characteristics: absorption maxima (λ), molar absorptivities (ε_λ), limits of detection (LOD), limits of quantitation (LOQ), constants of extraction (K_ex), and fractions extracted (E) have been determined. The system in which AD = PAR has better performance: ε₅₁₂ = 9.9×10⁴ dm³ mol^–1 cm^–1, LOD = 2.8 ng/cm³, LOQ = 9.4 ng/cm³, log K_ex = 4.1, and E = 97%. Extraction equilibrium with this reagent is achieved in a short time (only a few seconds) and the optimum pH interval is broad (5.1–7.8).

中文翻译：

---

偶氮染料和盐酸甲氧咪唑啉萃取镓（Ⅲ）的显色系统

摘要

研究了两种基于偶氮染料（ADs）和盐酸木咪唑啉（XMH）的Ga ^III液-液萃取-生色系统。使用的AD是4-（2-吡啶基偶氮）间苯二酚（PAR）和4-（2-噻唑基偶氮）间苯二酚（TAR）。研究了易于形成氯仿的通式（XMH ⁺）[Ga ^III（AD ^2-–）₂ ]三元配合物形成的最佳条件（pH，AD浓度，XMH浓度和萃取时间）。出来。下面萃取-分光特性：吸收最大值（λ），摩尔吸光系数（ε _λ），检测限（LOD），定量限（LOQ），提取的常数（ķ_前），并确定了提取的分数（E）。的系统，其中AD = PAR具有更好的性能：ε ₅₁₂ = 9.9×10 ⁴分米³摩尔^-1厘米^-1，LOD = 2.8毫微克/厘米³，LOQ = 9.4毫微克/厘米³，日志ķ _EX = 4.1，并且E＝ 97％。在短时间内（仅几秒钟）即可达到该试剂的萃取平衡，并且最佳的pH间隔很宽（5.1–7.8）。