摘要
在 0 .0 4mol·L- 1磷酸中 ,锑 (Ⅲ ) 钛铁试剂 (Tiron) 溴化十六烷基三甲胺体系产生灵敏的极谱络合吸附波。峰电位为 - 0 .4 4V(vs .SCE) ,二阶导数峰高与锑 (Ⅲ )浓度在 8.2× 10 - 10 ～ 2 .0× 10 - 6mol·L- 1范围内呈线性关系 ,检出限达 4× 10 - 10 mol·L- 1。研究了极谱波的性质及电极反应机理。方法应用于三氧化二砷及铜合金中微量锑的直接测定 。
In a medium of 0.04mol·L -1 H 3PO 4, antimony(Ⅲ) reacts with tiron and CTMAB to form a ternary complex, which shows a sharp wave on the dropping mercury electrode at the peak potential of -0.44V(vs.SCE). The second derivative peak height keeps a linear relation ship with the concentration of antimony(Ⅲ) in the range of 8.2×10 -10～2×10 -6mol·L -1, and the detection limit is 4×10 -10mol·L -1. A comparative study on the mechanism of the electrode reaction and on the properties of the polarographic adsorptive wave of the complex was made by several electrochemical methods. The method has been used in the determination of antimony in arsenous oxide and copper alloy with satisfactory results.
出处
《理化检验（化学分册）》
CAS
CSCD
北大核心
2002年第9期438-440,共3页
Physical Testing and Chemical Analysis(Part B:Chemical Analysis)
