双显色剂高灵敏协同显色反应的研究——钴(Ⅲ)-亚硝基R盐-结晶紫体系  

Studies on the Highly Sensitive Sinergistic Colour Reactions Using Two Different Chromogenic Reagents——Cobalt(Ⅲ)-Nitroso R Salt-Crystal Violet System

作　　者：沈含熙[1] 凌蓉[1] 

机构地区：[1]南开大学化学系,天津300071

出　　处：《分析化学》1990年第8期700-704,共5页Chinese Journal of Analytical Chemistry

基　　金：国家自然科学基金

摘　　要：在水溶液中钴(Ⅱ)与亚硝基R盐所形成的配合阴离子可以与有机碱阳离子(结晶紫)缔合形成中性缔合分子。在聚乙烯醇存在下,配合物可稳定存在于水溶液中。钴(Ⅲ)-亚硝基R盐-结晶紫配合物在510nm处有一最大吸收,摩尔吸光系数ε_(510)=1.47×l0~5L·mol^(-1)·cm(-1)。配合物中各组分的摩尔比为:Co:R:CV=1:3:6。反应具有较高的选择性,采用双峰双波长法测定钴可使灵敏度得到进一步提高,相应的摩尔吸光系数ε_(510-640)=4.09×10~5L·mol^(-1)·cm^(-1)。方法用于合成试样中钴的测定,结果满意。In an acidic medium, the cations of organic basic dye(crystal violet)can react to form an ion-associate complex with the anions, formed by cobalt (Ⅱ) ions with nitroso R salt. The product solubilized by polyvinyl alcohol is very stable in the aqueous solution. The ion-associate complex of Co-nitroso R(R)salt-crystal violet (CV) exhibits a sharp maximum absorption at 510nm. Its molar absorptivity is found to be 1. 47×10~5L. mol^(-1). cm^(-1). The molar ratio of each component in the complex is estimated as Co: R: CV=1: 3: 6. The reaction is highly selective. Due to the strong absorption of reagents at 590nm, if the dual-wavelength method is chosen for determination, the sensitivity is increased, and the molar absorptivity is found to be 4. 09×10~5L. mol^(-1). cm^(-1). The method has been used to determine cobalt in the synthetic samples with satisfactory results.

关 键 词：钴 亚硝基R盐 结晶紫 协同显色 

分 类 号：O614.812[理学—无机化学]