Use of a Hydrophobic Azo Dye for the Centrifuge-Less Cloud Point Extraction–Spectrophotometric Determination of Cobalt
作者:Kiril Blazhev Gavazov、Petya V. Racheva、Nikolina P. Milcheva、Vidka V. Divarova、Denitsa Dimitrova Kiradzhiyska、Fatma Genç、Antoaneta D. Saravanska
DOI:10.3390/molecules27154725
日期:——
The hydrophobic azo dye 6-hexyl-4-(2-thiazolylazo)resorcinol (HTAR, H2L) was studied as part of a system for the centrifuge-less cloud point extraction (CL-CPE) and spectrophotometric determination of traces of cobalt. The extracted 1:2 (Co:HTAR) complex, [CoIII(HL−)(L2−)]0, shows an absorption maximum at 553 nm and contains HTAR in two different acid–base forms. Optimum conditions for its formation
研究了疏水性偶氮染料 6-己基-4-(2-噻唑基)间苯二酚 (HTAR, H 2 L) 作为无离心浊点萃取 (CL-CPE) 和分光光度法测定痕量钴系统的一部分。提取的 1:2 (Co:HTAR) 络合物 [Co III (HL − )(L 2− )] 0在 553 nm 处显示最大吸收,并含有两种不同酸碱形式的 HTAR。其形成和CL-CPE的最佳条件如下:1×10 -5 mol L -1 HTAR,1.64% Triton X-114,pH 7.8,孵育时间约20分钟。 50°C,冷却时间约 30 分钟。 −20°C。线性范围、检测限和表观摩尔吸光系数分别为5.4-189 ng mL -1 、1.64 ng mL -1和2.63 × 10 5 L mol -1 cm -1 。该方法不使用任何有机溶剂,具有简单、廉价、灵敏、方便、环保等特点。它已成功应用于人造混合物和实际样品的分析,例如钢材、牙科合金、雨水、维生素B