4,5-二溴苯基荧光酮光度法测定钇  

Spectrophotometric Determination of Yttrium with 4,5 Dibromophenylfluorone

作　　者：李祖碧[1,2] 王加林[1,2] 程光祥 徐其亨[1,2] 

机构地区：[1]云南大学成人教育学院 [2]云南大学化学系

出　　处：《分析试验室》1997年第2期42-44,共3页Chinese Journal of Analysis Laboratory

摘　　要：研究４，５－二溴苯基荧光酮（ＤＢＰＦ）灵敏光度法测定钇。在ｐＨ５．５缓冲溶液中钇（Ⅲ）与ＤＢＰＦ形成橙红色络合物，最大吸收波长位于５５０ｎｍ，表观摩尔吸光系数ε值１．５３×１０５Ｌ·ｍｏｌ－１·ｃｍ－１，钇量在每２５ｍＬ０～８μｇ范围内服从比耳定律，测定极限６．８μｇ／Ｌ（ｎ＝９），对于钇０．２４ｍｇ／Ｌ测定的相对标准偏差为２．６％（ｎ＝９），络合物的摩尔组成为Ｙ∶ＤＢＰＦ＝１∶３。方法用于镁合金和地质标样中钇的测定，结果满意。A sensitive spectrophotometric method for determination of yttrium with 4,5 dibromophenylfluorone (DBPF) has been developed.An orange red complex is formed in pH5.5 buffer solution.The complex gives a high absorption at 550nm.The apparent molar absorptivity is 1.53×10 5L·mol -1 cm -1 .The system obeys beer's law in the range of 0～8 μg per 25mL.The limit of detection is 6.80ng per mL ( n =9).A sample of 0.24mg/L yttrium was analybed nine times,the ralative standard deviation was 2.6%.The composition of the complex was established as Y∶DBPF=1∶3.The method has been used in the determination of yttrium in magnesium base alloys and some ores with satisfactory results.

关 键 词：钇 二溴苯基荧光酮 光度法 

分 类 号：O614.322[理学—无机化学] O657.32[理学—化学]