摘要
在ｐＨ＝５．０的ＨＡｃＮａＡｃ介质中，Ｎｂ（Ⅴ）与１－苯基－３－甲基－４－苯甲酰基－吡唑啉酮－５（ＰＭＢＰ）生成络合物，于一０．９６Ｖ（ｖｓ．ＳＣＥ）出现一尖极谱波。在滴汞电极上用示波极谱仪或在悬汞电极上则吸附伏安曲线。峰电流与Ｎｂ（Ⅴ）浓度分别在０．００７５－０．８０μｇ／ｍＬ及０．００００７５－０．００７５μｇ／ｍＬ范围内呈线性关系。实验
In the medium of HAc-NaAc(pH=5. 0), Nb(V) reacts with 1-phenyl-3-methyl-4-benzoyl-5-pyrazolone (PMBP) to form a complex, and appear a sharp polarographic wave on DME and a voltammetric curve on HMDE at - 0. 96 V(vs. SCE). The peak height is linear with the concentration of Nb(V) in the range of 0. 0075-0. 80 μg/mL and 0. 000075-0. 0075 μg/mL, respectively. Interferences from more than thirty ions were tested. The method is used to determine niobium in steel after separation by phenylarsonic acid with high sensitivity, the detection limit is 0. 00003 μg/mL. The stability of the solution can be remained for more than 96 h. The ratio of Nb to PMBP in the complex is 1 : 1 and the complex is positive. The number of electron transfer is 2. The wave is an adsorptive wave. The peak current is produced by the reduction of the ligand PMBP in the complex.
出处
《分析化学》
SCIE
EI
CAS
CSCD
北大核心
1995年第8期899-902,共4页
Chinese Journal of Analytical Chemistry
基金
四川省教委科研基金资助课题.
关键词
铌
钢
电极反应机理
PMBP
极谱法
Niobium, 1-phenyl-3-methyl-4-benzoyl-5-pyrazolone, adsorptive wave, polarog-raphy
