2-(2-咪唑偶氮)-5-二乙氨基酚与钒的显色反应及其应用  

Color Reaction of 2 (2 Imidazolylazo) 5 diethylamino Phenol with Vanadium and Its Application in Spectrophotometry

作　　者：梁华定[1] 葛昌华[1] 潘富友[1] 

机构地区：[1]浙江台州师范专科学校,浙江临海市317000

出　　处：《岩矿测试》2000年第2期119-121,共3页Rock and Mineral Analysis

基　　金：浙江省教委科研计划课题!(19990 36 5 )

摘　　要：研究了新试剂 2 - (2 -咪唑偶氮 ) - 5-二乙氨基酚 (IZAPN)与V(Ⅴ )的显色反应 ,在pH 5的HAc NaAc介质中 ,V(Ⅴ )与IZAPN形成稳定的紫红色络合物 ,其组成比为nV∶nR=1∶2 ,最大吸收波长位于 575nm ,表观摩尔吸光系数为 2 96× 1 0 4 L·mol- 1 ·cm- 1 ,V(Ⅴ )在 0～ 0 8mg/L内服从比尔定律。在NaF和硫脲联合掩蔽下 ,方法可用于铝合金和合成废水中V(Ⅴ )的测定 ,加标回收率 1 0 0 0 %～ 1 0 0 5% ,RSD(n =6)≤ 2 0 %。Color reaction of 2 (2 imidazolylazo) 5 diethylamino phenol(IZAPN) with vanadium are studied in this paper In the presence of HAc NaAc (pH 5 0) IZAPN reacts with V(Ⅴ) to form a stable red complex ( n V(Ⅴ) ∶ n R=1∶2) The maximum absorption is at 575 nm with apparent molar absorptivity of 2 96×10 4 L·mol -1 ·cm -1 Beer′s law is obeyed in the concentration range of 0～0 8 mg/L for vanadium(Ⅴ) The selectivity of the reaction is improved by the addition of NaF and thiourea as masking agents The method has been applied to the determination of vanadium in aluminum alloys and synthetic waste water samples The recovery of standard addition is 100 0%～100 5% with precision of ≤2 0% RSD( n =6)

关 键 词：2-咪唑偶氮 -5-二乙氨基酚 钒 显色反应 

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