摘要
本文用计时电量法探讨了镍(Ⅱ)-硫代氨基脲在悬汞电极上吸附还原的机理,表明其吸附模式为直接吸附,吸附形体为Ni(T3C)_2^(2+)。利用Ni(TSC)_2^(2+)络合物的吸附性,可采用预先将Ni(TSC)_2^(2+)吸附富集在悬汞电极上然后再进行电位扫描的吸附伏安法来测定痕量Ni.线性扫描伏安法和微分脉冲伏安法的检测下限可分别达到1×10^(-8)mol/L和4×10^(-9)mol/L。
In a supporting electrolyte containing 0. 025 mol/L potassium hydrogen phthalate, a sensitive adsorptive peak of Ni( Ⅱ )-TSC system at the Hg electrode was found. The mechanism of the peak was studied by chronocoulometry. The study shows that in the presence of TSC the adsorption of Ni( Ⅱ ) at the surface of Hg electrode is direct adsorption of Ni( Ⅱ )-TSC complex and the adsorbed species is Ni( Ⅱ )(TSC)22+. The detection limits are 1×10-8 mol/L and 4×10-9mol/L by linear sweep adsorptive stripping voltammetry and differential pulse adsorptive stripping voltammetry, respectively.
出处
《高等学校化学学报》
SCIE
EI
CAS
CSCD
北大核心
1989年第8期796-799,共4页
Chemical Journal of Chinese Universities
基金
国家自然科学基金
