铁(Ⅲ)-4-(2-吡啶偶氮)间苯二酚络合物光化学还原反应的研究  

Study on the Photoreduction of Fe^(3+)-4-(2-Pyridylazo)resorcinol Complex

作　　者：吴小华[1] 缪吉根[1] 陈建荣[1] 

机构地区：[1]浙江师范大学化学与生命科学学院,金华321004

出　　处：《分析化学》2007年第5期695-699,共5页Chinese Journal of Analytical Chemistry

基　　金：浙江省分析测试基金项目资助(No.98061)

摘　　要：在弱酸性溶液中,Fe3+-PAR络合物可发生光化学还原反应生成Fe2+-PAR络合物。研究了溶液酸度、光强度、有机酸、PAR溶液浓度对Fe3+-PAR络合物光化学还原反应的影响,并对反应机理作了初步探讨。在pH4.5HAc-NaAc缓冲溶液中,PAR浓度为1.8×10?4mol/L,125W高压汞灯照射15min,Fe3+-PAR络合物的光化学还原反应趋于完全。Fe2+浓度在0.12～3.2mg/L范围内符合比尔定律;检出限为0.025mg/L。Fe^3＋ -4-（2-pyridylazo）resorcinol （PAR） complex undergoes photoreduction in weak acid solution to produce Fe^2＋ -PAR complex. The effects of solution acidity, light intensity, the presence of specific organic acids and PAR concentration on the photoreduction of Fe^3＋ -PAR complex were studied, and the photoreducion mechanism was discussed. The results show that Fe^3＋ -PAR complex in a HAc-NaAc buffer solution （ pH 4.5 ） containing PAR （concentration 1.8 × 10^ 4 mol/L） can be transformed into Fe^2＋ -PAR complex completely when subjected to continuous illumination （the high-pressure Hg-lamp, 125 W） for 15 minutes. The Beer＇s law is obeyed in the range of 0.12 - 3.2 mg/L of iron （Ⅱ） and the detection limit is 0. 025 mg/L. Based on the results, a new photoreduction method has been developed for the determination of iron.

关 键 词：铁 4-(2-吡啶偶氮)间苯二酚 光化学还原 分光光度法 

分 类 号：O627.81[理学—有机化学]