偶氮氟胂-Ⅲ的合成及其与钍的显色反应研究  

Study on the synthesis of fluoroarsenazo-Ⅲ and its chromogenic reaction with thorium

作　　者：徐锋[1] 高美荣[1] 王冰[1] 沈丽莉[1] 吴斌才[1] 

机构地区：[1]华东师范大学化学系,上海200062

出　　处：《冶金分析》2004年第3期14-16,共3页Metallurgical Analysis

摘　　要：合成了新显色剂偶氮氟胂 Ⅲ并研究了其与钍的显色反应。在 3 84mol/L的高氯酸介质中 ,钍与该显色剂形成紫红色络合物 ,最大吸收波长为 65 6nm ,表观摩尔吸光系数为 1 5 6× 10 5,于 2 5mL溶液中 ,钍含量在 0～ 5 5 μg范围内符合比尔定律。该方法简便 ,灵敏度高 ,选择性好 ,用于海产品中微量钍的测定 。A new chromogenic reagent 2,7-dis(5-fluoro-2-arsenophenylazo)-1,8-dihydroxynaphthalene-3,6-disulfonic acid(abb. fluoroarsenazo Ⅲ or FAsA-Ⅲ) was synthesized and its color reaction with thorium was studied. In a perchloric acid medium of 3.84 mol/L,FAsA-Ⅲ reacts with thorium to form a stable coordinate-complex with maximum absorption at 656 nm. The apparent molar absorptivity was found to be 1.56×10 5 L·mol -1·cm -1. Beer's law is obeyed in the concentration range of 0-55 μg of Th*$ in 25 mL solution.The method can be applied to determine thorium in seafood with satisfactory results.

关 键 词：海产品 偶氮氟胂-Ⅲ 合成 钍 显色反应 分光光度法 

分 类 号：O657.32[理学—分析化学]