二溴羟基苯基荧光酮分光光度法测定微量锰的研究  

Spectrophotometric Determination of Trace Amounts of Manganese with 2,3,7-Trihydroxy-9-Dibromo- Hydroxyphenyl Fluorone (DBH-PF)

作　　者：魏芳[1] 敖登高娃[1] 赛音[1] 

机构地区：[1]内蒙古大学化学系

出　　处：《内蒙古大学学报（自然科学版）》1998年第1期76-78,共3页Journal of Inner Mongolia University：Natural Science Edition

基　　金：内蒙古大学青年科学基金

摘　　要：研究了在表面活性剂溴化十六烷基三甲胺（ＣＴＭＡＢ）存在下，二溴烃基苯基荧光酮（ＤＢＨ－ＰＦ）分光光度法测定微量锰的最佳显色条件及应用．实验结果表明，在ｐＨ９．４～１０．１的硼砂－ＮａＯＨ缓冲溶液中，锰与ＤＢＨ－ＰＦ形成的１∶２的配合物，其最大吸收波长λｍａｘ＝５９０ｎｍ，表观摩尔吸光系数为ε５９０＝１．５１×１０５Ｌ·ｍｏｌ－１·ｃｍ－１，锰含量在０～６μｇ／２５ｍｌ范围符合比定律，方法用于测定茶叶及合金钢中的微量锰（Ⅱ）． The complex of Mn(Ⅱ) and DBH-PF is formed in the presence of CTMAB.The results show that in Na_2B_4O_7NaOH buffer solution of pH from 9.4-10.1,the soluble purplered tetrabasic complex of Mn(Ⅱ) with DBH-PF-CTMAB is formed with the maximum absorption wavelength at 590 nm,the apparent molar absorption coefficient is 1.51×105 L·mol-1·cm-1.The Beer′s law is obeyed in the concentration range of 0￣6 μg/25 ml for Mn(Ⅱ).The molar ratio in the complex has been estimated to be Mn(Ⅱ)∶DBH-PF=1∶2.Trace amounts of Manganese in tea and alloy steel have been determined by the proposed method and the results obtained are satisfactory.

关 键 词：锰 荧光酮 分光光度法 DBH-PF 

分 类 号：O614.711[理学—无机化学] O657.32[理学—化学]