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钴(Ⅱ)与亚硝基红盐(NRS)、氯代十四烷基吡啶(TPC)所形成的三元络合物在示波器极谱仪上产生一灵敏的二阶导数极谱波,比没有TPC存在时,峰高增加近20倍.在7 .0×10~(-10)~6 .0×10~(-6)mol/L的范围内,钴(Ⅱ)的浓度与峰电流有良好的线性关系,检出限为1·4×10~(-10)mol/L(8·0 ng/L) .研究了络合物的电化学行为,经计算得到Co(Ⅲ)-NRS-TPC三元络合物的配比为1∶3∶6 ,稳定常数为6·5×10~(37),三元络合物在电极表面的吸附符合福兰克林方程,吸附系数(β)为1·21×10~5L/mol ,饱和吸附量(Γs)为9·8×10~(-10)mol/cm2,吸引因子(v)为0·96 .
Ternary complexes of cobalt (II) with nitroso-red salt (NRS) and chlorotetradecylpyridine (TPC) produce a sensitive second-order derivative polarographic wave on the oscilloscope polarography In the absence of TPC, the peak height increased nearly 20-fold. In the range of 0.7 × 10 -10 -6.0 × 10 -6 mol / L, the concentration of cobalt (Ⅱ) The detection limit was 1.4 × 10 ~ (-10) mol / L (8 · 0 ng / L). The electrochemical behavior of the complex was studied and the Co (Ⅲ) - The ratio of NRS-TPC ternary complex is 1: 3: 6 and the stability constant is 6.5 × 10 ~ (37). The adsorption of ternary complex on the electrode surface accords with Franklin’s equation. The adsorption coefficient (β) was 1.21 × 10 ~ 5L / mol, the adsorption capacity (Γs) was 9.8 × 10 ~ (-10) mol / cm2 and the attraction factor (v) was 0.96.