对二甲基氨基苯甲酰胺基硫脲用于苯甲醛的荧光光度法测定  

A fluorescent determination of benzaldehyde using p-(dimethylamino)benzamido-thiosemicarbazide

作　　者：王春燕[1] 吴芳英[1] 谢飞燕[1] 

机构地区：[1]南昌大学化学系,南昌330031

出　　处：《分析试验室》2008年第12期72-75,共4页Chinese Journal of Analysis Laboratory

基　　金：江西省教育厅(2005-38);江西省自然科学基金(2007GZH2119)项目资助

摘　　要：对二甲氨基苯甲酰胺基硫脲（DMABATU）与苯甲醛反应生成发强荧光的席夫碱，该反应用于苯甲醛的定量测定。在pH5．30NaAc．HAc缓冲溶液中（含乙腈20％），苯甲醛浓度在1．25×10^-7～3．23×10^-6mol／L范围内与荧光强度呈良好的线性关系，方法检出限为3．75×10^-8mol／L，具有相似反应功能团的物质如甲醛、乙醛、丙酮及苯乙酮的存在均不干扰其测定，表现出较好的选择性，该方法应用于废水中苯甲醛的测定，回收率为97．0％-98．5％。p-（dimethylamino） benzamido-thiosemicarbazide （DMABATU） was proposed for determining benzaldehyde via fluorescence spectroscopy. A strong fluorescence compound, schiff＇s base, was formed based on the reaction between DMABATU and benzaldehyde. In pH 5.30 NaAe-HAc water-acetonitrile （v/v = 80/20） mixture solution, a good linear fluorescence response as a function of benzaldehyde concentration was obtained ranging from 1.25 × 10^-7 to 3.23 × 10^-6 mol/L. The detection limit was 3.75 × 10^-8 mol/L. The existence of a large amount of formaldehyde, ac- etaldehyde, acetone and hypnone didn＇ t interfere the determination of benzaldehyde which implied high selectivity. The introduced method was applied to determining benaldehyde in discharge water and the recoveries were 97.0% - 98.5 % with satisfactory results.

关 键 词：对二甲氨基苯甲酰胺基硫脲 苯甲醛 荧光光度法 

分 类 号：O657.3[理学—分析化学]