荧光猝灭法快速测定环境水中痕量铬(Ⅲ)  

Fleetly Determination of Chromium(Ⅲ) in Water by Fluorimetric Quenching Method

作　　者：李永强[1] 王金中[1] 王崇妍[1] 

机构地区：[1]河南大学化学化工学院,河南开封475001

出　　处：《信阳师范学院学报（自然科学版）》2006年第2期217-219,222,共4页Journal of Xinyang Normal University(Natural Science Edition)

基　　金：河南省自然科学基金资助项目(0311021700)

摘　　要：在NH4Cl-NH3·H2O缓冲溶液介质中铬（Ⅲ）能使荧光试剂水杨醛缩氨基硫脲荧光强度降低．降低的程度随铬（Ⅲ）含量的增加而增大，据此建立了测定痕量铬（Ⅲ）的荧光分析方法．其铬（Ⅲ）的量在20．0—260.0μg／L范围内与△F呈良好的线性关系，方法的检出限为：13．6μg/L，相对标准偏差为2．12％．该方法操作简便、反应迅速、灵敏度高，可直接用于自来水，池塘水度工业废水中铬（Ⅲ）的测定．Salicylic aldehyde thiosemicarhazone was quenched by Cr（ Ⅲ ） in the medium of ammonium chloride and ammonia , the degree of quenching increases with the content of nitrite ion increases . A method based on fluorescence quenching for determination of trace Cr（ Ⅲ ） was proposed. The detection limit was 13.6μg/L and the linear range of determination is 20.0 -220.0 μg/L. The proposed method is simple and highly sensitive for determination of trace Cr（ Ⅲ ） in water samples of industrial,water supply and well.

关 键 词：荧光猝灭 铬 水杨醛缩氨基硫脲 

分 类 号：O657.32[理学—分析化学]