紫脲酸铵光度法测定微量钴  

Spectrophotombtric Determination of Trace Cobalt Using Murexide

作　　者：蒋兰宏[1] 阎俊英[1] 

机构地区：[1]河北师范大学化学学院,河北石家庄050091

出　　处：《河北师范大学学报（自然科学版）》2003年第1期67-69,共3页Journal of Hebei Normal University：Natural Science

摘　　要：通过对钴(Ⅱ)与紫脲酸铵显色反应的研究,建立了一种测定微量钴的新方法.pH为8～9时钴(Ⅱ)与紫脲酸铵反应生成1:3络合物,其Aλmax为458 nm,ε为2.65×104L/(cm·mol),钴浓度在0.0～2.0 mg/L范围内服从比尔定律.通过对维生素B12中钴的测定,相对标准偏差为1.43％～2.17％,加标回收率为97％～112.5％.A new method for determination of trace cobalt was developed through the study on the color reaction for murexide with cobalt. The results showed that combalt formed stable complex with murexide at pH 8-9.The molar ration of cobalt to murexide was found to be 1:3. Its apparent molar absorptirity was 2.65 × 104 L/(cm·mol) at 458 nm.Beer's law was obeyed in the range of 0.0-2.0 mg/L for cobalt.The method was used to determine cobalt in VB12. The recovery was 97% -112.5% with RSD of less than 2.17%.

关 键 词：钴 紫脲酸铵 分光光度法 含量测定 显色反应 表面活性剂 维生素B12 

分 类 号：O614.812[理学—无机化学] O657.32[理学—化学]