荧光熄灭法测定煤矸石中微量锌  

Determination of Micro Zinc in Coal Gangues by the Fluorescence-Quenching Method

作　　者：罗道成[1] 易平贵[1] 刘俊峰[1] 李佳秋[1] 

机构地区：[1]湘潭工学院化工系,湖南湘潭411201

出　　处：《岩矿测试》2002年第1期76-78,共3页Rock and Mineral Analysis

摘　　要：在pH 8 .6的Na2 B4O7-HCl缓冲介质中 ,基于微量Zn2 +对 5 -溴水杨基荧光酮体系的荧光熄灭效应 ,建立了测定微量Zn2 +的荧光分析方法。结果表明 ,当激发波长λex=3 6 5nm ,荧光发射波长λem=5 3 8nm时 ,Zn2 +量在 0 .0～ 40 0 .0 μg/L内与体系的荧光熄灭程度呈线性关系 ,方法的检出限为 0 .3 8μg/L。方法用于煤矸石中微量Zn2 +的测定 ,结果与极谱法结果一致 ,6次测定的RSD <3 .0 %。In the buffer solution of Na 2B 4O 7 HCl (pH?8.6) the reaction of micro Zn 2+ with 5 BrSAF was studied. Based on this study, a sensitive fluorescence quenching method for the determination of micro Zn 2+ was established. The results show that the maximum excitation and emission wavelengths are found to be 365?nm and 538?nm respectively.The linear range is 0.0～400.0?μg/L and the detection limit is 0.38?μg/L for Zn 2+ . The method has been applied to the determination of micro Zn 2+ in coal gangues and the results are in agreement with those provided by polarography with precision of <3.0% RSD ( n =6).

关 键 词：煤矸石 锌 5-溴水杨基荧光酮 荧光熄灭法 极谱法 煤 

分 类 号：TQ533.1[化学工程—煤化学工程]