摘要
在邻苯二甲酸氢钾和甲酸的混合缓冲底液(pH4.8)中,钪与茜素氨羧络合剂形成电活性络合物 ,在单扫描极谱上于 -0.54V(vsSCE)产生一灵敏的络合吸附波 ,其二阶导数峰高与钪的浓度在4.0×10-8 ～3.0×10-6mol/L范围内呈线性关系 ,检出限达2.0×10-8 mol/L。测定了络合物的组成 ,探讨了极谱波的性质和电极反应机理。方法用于矿物中微量钪的测定 。
A sensitive adsorptive wave of scandium-alizarin complexan complex has been obtained by using single _ sweep polarography in 3×10-2 mol/L potassium acid phthalate and 0.15 mol/L formic acid-sodium formate mixed buffer solution(pH 4.8)containing 1.2×10-5 mol/L alizarin complexan. The second _ order derivative peak height of the complex at -0.54 V(vs SCE)is proportional to the concentration of Sc(Ⅲ)over the range of 4.0×10-8～3.0×10-6 mol/L. The detection limit is 2.0×10-8 mol/L. The molar ratio of the components in the complex has been estimated as n(Sc3+)∶n(ALC)=1∶2. The properties of the polarographic wave and the electrode reaction mechanism were also discussed in detail. The method has been applied to the determination of the trace Sc(Ⅲ) in the mineral samples with satisfactory results.
出处
《分析测试学报》
CAS
CSCD
北大核心
2001年第4期69-71,共3页
Journal of Instrumental Analysis
