偶氮氟膦-DBF的合成及其与稀土、铋、钍显色反应的研究  

Synthesis of fluorophosphonazo-DBF (FPA-DBF) and the study on its chromogenic reaction with rare earths, bismuth and thorium .

作　　者：彭志华[1] 俞善辉[1] 徐锋[1] 吴斌才[1] 

机构地区：[1]华东师范大学化学系,上海200062

出　　处：《化学试剂》2003年第6期350-352,共3页Chemical Reagents

摘　　要：合成了新显色剂偶氮氟膦-DBF,并对其与稀土(铈、钇)和铋、钍的显色反应条件及应用进行了研究。与稀土的反应酸度范围是pH0.49～2.09(铈)、pH0.61～2.09(钇),配合物的最大吸收在630nm,表观摩尔吸光率εCe=1.13×105L·mol-1·cm-1,εY=1.08×105L·mol-1·cm-1。与铋、钍的反应酸度范围分别为pH0.14～1.32、pH0.08～0.62,表观摩尔吸光率分别为εBi=1.02×105L·mol-1·cm-1,εTh=1.34×105L·mol-1·cm-1。试剂应用于胃必治中铋、海产品中微量钍的测定,结果满意。New chromogenic reagent fluorophosphonazo-DBF(FPA-DBF) was synthesized and refined. Conditions of its chromogenic reaction with rare earths, bismuth and thorium were optimized. The ranges of acidity for reactions with rare earths are pH 0.49 - 2. 09 (cerium), pH 0. 61-2. 09(yttrium). The complexes of rare earths with the reagent have maximum absorption at about 630 nm and the apparent molar absorptivitis are εCe=1.13×105 L·mol-1·cm-1 and εY = 1.08×105L·mol-1·cm-1.The ranges of acidity for reactions with bismuth and thorium are pH 0.14~1. 32,pH0. 08~0. 62 respectively. The apparent molar absorptivities of the complexes are εεBi=1.02×105L·mol-1·cm-1 and εTh = 1. 34×105L·mol-1·cm-1 respectively. This method has been used to determine Bi (Ⅲ) in compound bismuth aluminate tablets and trace Th (Ⅳ) in seafood with satisfactory results.

关 键 词：显色剂 偶氮氟膦—DBF 合成 稀土 铋 钍 显色反应 胃必治 海产品 

分 类 号：TQ613.1[化学工程—精细化工]