【摘要】 <正> 用卟啉类显色剂测定钴的研究还较少,而且已报道的均为水溶性卟啉。鉴于非水溶性卟啉合成及提纯容易、产率高、种类多等优点,本文在研究非水溶性α,β,γ,δ-四苯基卟啉（简称TPP）与Cu（Ⅱ）、Pd（Ⅱ）、Cd（Ⅱ）等配合反应的基础上又研究了该试剂与Co（Ⅱ）的反应。在阴离子表面活性剂十二烷基硫酸钠（SDS）存在下,利用咪唑加速催化Co（Ⅱ）对Cd-TPP配合物的置换反应,使Co（Ⅱ）与TPP形成了很稳定的配合物。ε₄₃₅=3.02×10⁵L·mol^-1·cm^-1。是目前卟啉类试剂测定钴较灵敏的方法,测定维生素B₁₂中钴,结果满意。更多还原

【Abstract】 The coloring reaction of TPP with Co (Ⅱ) was studied in the presence of anionic surfactant (SDS). It was shown that the highly sensitive and highly stable complex of TPP with Co(Ⅱ) was formed through the exchange reaction between Co (Ⅱ) and Cd-TPP complex. The molar absorptivity ε 435nm is 3.02 × 10 5 L. mol-1.cm-1. The complex was estimated to be 1:1 by the continuous variation method. The interference of 27 kinds of ions was examined with the aid of a mixture of sodium thiosulphate, patassium sodium tatrate and sodium fluoride as a masking agent. The established method was applied to the determination of Co (Ⅱ) in the injection of vitamin B12 with satisfactory results.更多还原