摘要
在pH5.6的0.2mol/L NH_4Ac-3×10^(14)mol/L N-苯甲酰苯胲(N-BPHA)底液中,用单扫示波极谱法可得到Bi(Ⅲ)的络合物吸附波,峰电位-0.33V(vs.SCE)左右。导数峰高与铋的浓度在5.0×10^(-8)～4.0×10^(-6)mol/L的范围内呈线性关系,检出限为2.0×10^(-8)mol/L。实验表明,该极谱峰属于络合物吸附波,测定其络合比为Bi(Ⅲ):N-BPHA=1:3。测定了该体系的吸附量;Bi(Ⅲ)-N-BPHA络合物在悬汞电极上的吸附符合Frumkin等温式,测得吸附系数β=2.87×10~5,吸引因子α=0.984。用于矿石中微量铋的测定。
In a supporting electrolyte containing 3×10^(-4)moI/L BPHA and 0. 2mol/L NH_4Ac at pH = 5. 6,an adsorptive complex wave of bismuth (Ⅲ)- BPHA is observed by single-sweep polarography. It has been found that the peak potential of the derivative wave is -0.33V (vs. SCE) and the limit of detection for bismuth(Ⅲ ) is 2.0× 10^(-8)mol/L. The composition ratio of Bi(Ⅲ ) to BPHA in the complex is determined to be 1: 3. On the surface of HMDE,the adsorption of Bi(Ⅲ)-BPHA complex obeys Frumkin adsorption isotherm. The adsorption coefficeent β is 2. 87×10~5and the attractive factor α is 0. 984.
出处
《分析试验室》
CAS
CSCD
北大核心
1991年第5期21-25,共5页
Chinese Journal of Analysis Laboratory
基金
国家自然科学基金
关键词
铋
测定
结合附波
N-BPHA
Bismuth determination
Benzoylphenylhydroxyamine
Adsorptive complex wave
