表面活性剂增敏2,4-二氯苯基荧光酮分光光度法测定煤中的微量锗  

Determination of Trace Germanium in Coal by Spectrophotometry with 2,4-Dichlorophenylfluorone

作　　者：赛音[1] 李胜[1] 韩福彬[1] 

机构地区：[1]内蒙古大学化学化工学院,内蒙古呼和浩特010021

出　　处：《光谱学与光谱分析》2004年第11期1404-1406,共3页Spectroscopy and Spectral Analysis

基　　金：与北京大学化学系合作资助项目

摘　　要：研究了在表面活性剂存在下,锗与2,4二氯苯基荧光酮(2,4DClPF)的显色条件,在18～25mol·L-1硫酸介质中,锗与2,4DClPF、阳离子表面活性剂十六烷基三甲基溴化铵(CTMAB)形成有色三元胶束络合物,其最大吸收波长为516nm,表观摩尔吸光系数ε为138×105L·mol-1·cm-1。方法的线性范围为0～125μg·25mL-1,回收率为103%～106%,相对标准偏差为11%～17%。所拟方法用于煤样中微量锗的测定,结果较满意。A method for the determination of germanium in coal samples by spectrophotometry has been developed. The color reaction of germanium with 2,4-dichlorophenylfluorone(2,4-DCIPF) in the presence of cetyltrimethylammonium bromide(CTMAB) has been studied. The results show that Ge(IV) reacts on 2,4-DCIPF and CTMAB to form a multicomponent complex in a 1.8-2.5 mol(.)L(-1) H-2 SO4 medium. The complex has the maximum absorption wavelength at 516 rim and its apparent molar absorptivity e is 1.38 x 10(5) L(.)mol(-1.)cm(-1). Beer's law is obeyed in the range of 0-12.5 mug(.)(25 mL)(-1) for Ge(IV). The recovery of standard addition is 103% 106% and the relative standard deviation(RSD) is 1.1%-1.7%. This method has been applied to the determination of Ge( W) in coal samples with satisfactory results.

关 键 词：2 4-二氯苯基荧光酮 胶束 增敏 相对标准偏差 CTMAB 十六烷基三甲基溴化铵 微量 阳离子表面活性剂 煤样 硫酸介质 

分 类 号：O657[理学—分析化学] O656.32[理学—化学]