摘要
在pH10的NH_4OH-NH_4Cl介质中,DBC-CPA在示波极谱上产生两个还原峰、峰电位分别为-1.11V和-1.19V(vs.SCE)。加入钡离子后两峰消失。在-1.15V处出现一新的还原峰,峰形稳定,峰高与钡离子浓度在5×10^(-9)-7×10^(-8)mol/L范围内呈线性关系,配合物的组成比为Ba^(2+):DBC-CPA=1:2,极谱峰的性质为配合物吸附波,该波可直接用于水样中痕量钡的测定。
In a solution of pH 10 NH_4OH- NH_4CI media, DBC-chlorophosphonazo shows two peaks with singlesweep polarograph . When barium is added,these peaks disappear and a new stable reduction peak at - 1.15V appears, which height is proportional to the concentration of barium in the range from 5×10^(-9) to 7×10^(-8)mol/ L.The poloragraphic wave is due to the adsorption of the complex of Ba with DBC- chlorophosphonazo , and the ratio of barium to DBC-chlorophosponazo is 1:2.This method can be used to determine directly trace barium in water samples.
出处
《分析试验室》
CAS
CSCD
北大核心
1989年第3期16-19,共4页
Chinese Journal of Analysis Laboratory
