摘要
在pH4.8的0.013mol/L的HAc-NaAc介质中,钥(Ⅵ)-7-(1-苯偶氮)-8-羟基喹啉-5-磺酸钠体系在滴汞电极上,于-0.46V(vs.SCE)电位处得到良好的吸附还原波,其二阶导数峰电流I_p与Mo(Ⅵ)在2.5×10^(-8)～4.5×10^(-7)mol/L浓度范围内呈良好的线性关系,检测限为1.25×10^(-8)mol/L Mo(Ⅵ),方法用于钢样中微量钼的测定,结果较好.对电极机理进行了研究.
Molybdenum-sodium-7-(1-benzeneazo)-8-hydroxyquinoline-5-sulfonate (BQ) complex pro- duces a reduction peak at-0.455 V( vs. SCE) on a dropping mercury electrode in 0.013 mol/L HAc-NaAc solution (pH = 4.8) . Under optimum conditions, the linear range of the concentration of Mo(Ⅵ)with the single-sweep second order derivative oscillopolarographic current was 2.5×10-8～4.5×10-7mol/L, the detection limit of Mo(VI) was 1.25×10-8 mol/L. This method has been applied to the determination of molybdenum in steel samples with satisfactory results. The mechanism of the electrode process has been studied.
出处
《分析化学》
SCIE
EI
CAS
CSCD
北大核心
1999年第11期1296-1299,共4页
Chinese Journal of Analytical Chemistry
关键词
钼
苯偶氮
羟基喹啉
磺酸钠
配合吸附波
测定
Molybdenum, sodium-7-(1-benzeneazo)-8-hydroxyquinoline-5-sulfonate, complex adsorptive wave
