钒(Ⅴ)-5-Br-PADAP-H_2O_2-吐温-80显色体系的研究与应用  

Spectrophotometric Determination of Vanadium with 2-(5-Bromo-2-Pyridyl-Azo)-5-Diethyl-Aminophenol and Hydrogen Peroxide

作　　者：吕天喜[1] 

机构地区：[1]浙江师范大学化学系,浙江省金华市321004

出　　处：《光谱实验室》2002年第3期424-426,共3页Chinese Journal of Spectroscopy Laboratory

摘　　要：研究了在非离子表面活性剂吐温 - 80存在下 ,钒 ( )与 2 - [(5 -溴 - 2 -吡啶 ) -偶氮 ]- 5 -二乙氨基苯酚 (5 -Br- PADAP)及 H2 O2 的显色反应。实验表明 :在 p H1.5— 4 .0范围内 ,钒 ( )与 5 - Br- PADAP、H2 O2 形成稳定的配合物 ,最大吸收峰位于 5 95 nm处 ,表观摩尔吸光系数为 6 .2× 10 4L· mol-1· cm-1,配合物组成比为钒 ( )∶ 5 - Br- PADAP∶ H2 O2 =1∶ 1∶ 1。钒含量在 0— 15μg/ 2 5 m L范围内服从比耳定律。该方法灵敏度较高 ,用于合成水样中钒的测定 ,结果令人满意。Colour reaction of vanadium(Ⅴ) with 2 (5 bromo 2 pyridyl azo) 5 diethyl aminophenol and hydrogen peroxide was studied. At pH 1.5-4.0 a stable 1∶1∶1 chelate was formed in aqueous solution in the presence of polysorlatum 80. The apparent molar absorptivity is 6.2×10 4L·mol -1 ·cm -1 at 595nm. Beer's law is obeyed in the range of 0-15μg/25mL for vanadium .The proposed method has been applied to the determination of vanadium synthetic water sample with satisfactory results.

关 键 词：钒 5-BR-PADAP H2O2 吐温-80 显色体系 分光光度法 测定 合成水样 吡啶杂环偶氮化合物 

分 类 号：O614.511[理学—无机化学] O657.32[理学—化学]