新显色剂偶氮氟胂-DBF的合成及与钍的显色反应  

Study on the Synthesis of 5-FAsA-DBF and Its Chromogenic Reaction with Thorium

作　　者：徐锋[1] 郝振文[1] 高美荣[1] 吴斌才[1] 

机构地区：[1]华东师范大学化学系,上海200062

出　　处：《华东师范大学学报（自然科学版）》2004年第2期69-71,80,共4页Journal of East China Normal University(Natural Science)

摘　　要：合成了新显色剂偶氮氟胂-DBF,并研究了其与钍的显色反应,在3.84 mol·L-1的高氯酸介质中,钍与该显色剂形成紫红色配合物,最大吸收波长为630 nm,表观摩尔吸光系数为1.63×105L·mol-1·cm-1,钍含量在每25 mL 0-40μg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,结果满意。A new chromogenic reagent 5-FAsA -DBF was synthesized and its colour reaction with thorium was studied. In a perchloric acid medium of 3. 84 mol·L-1. 5-FAsA-DBF reacted with thorium to form a stable coordinate-complex, having its absorption maxima at 630 nm. Its molar absorptivity was found to be 1. 63×105 L·mol-1 -cm-1. Beefs law holds in the concentration range of 0-40 μg of Th(Ⅳ) per 25 mL of solution. The method has been apllied to determinate thorium in seafood with satisfactory results.

关 键 词：吸光光度 钍 偶氮氟胂-DBF 海产品 

分 类 号：O655.11[理学—分析化学]