摘要
在 0 .2mol·L-1盐酸底液中 ,铋 (Ⅲ )与桑色素所形成的铋 (Ⅲ ) 桑色素络合物吸附于碳糊电极上 ,在 0 .30V(vs.SCE)预富集后 ,在 - 0 .30V处静止还原 30s ,再从 - 0 .30V到 0 .30V进行阳极化扫描 ,在 - 0 .0 8V左右获得一灵敏的铋溶出峰 ,其二次导数峰电流与铋 (Ⅲ )浓度在 2 .0× 10 -9～6 .0× 10 -6mol·L-1范围内呈线性关系 ,检出限达 1.0× 10 -9mol·L-1。探讨了电极反应机理 ,方法应用于胃药和锰盐中铋的测定 。
In a 0.2mol·L -1 HCl base solution, a complex of Bi(Ⅲ) with morin was formed and adsorbed on the carbon paste electrode. After accumulation at 0.30V(vs.SCE), it was reduced at -0.30V for 30s without stirring. The voltammogram was then recorded by an anodic potential scanning at a rate of 200mV·s -1 from -0.30V to 0.30V. The second derivative peak was obtained at -0.08V. Linearity was held between the second derivative peak height and the concentration of Bi(Ⅲ) in the range of 2.0×10 -9～6.0×10 -6mol·L -1. The limit of detection of the method was 1.0×10 -9mol·L -1 of bismuth(Ⅲ). The proposed method has been used in the determination of trace amounts of bismuth in manganese salts and in medicines for stomach diseases.
出处
《理化检验（化学分册）》
CAS
CSCD
北大核心
2002年第6期280-282,共3页
Physical Testing and Chemical Analysis(Part B:Chemical Analysis)
