【摘要】 研究了在两性表面活性剂十二烷基二甲基氧化胺(OB-2)存在下,钴与新合成试剂2,5-二(邻羟苯基)-1,3,4-噻二唑的显色条件及应用,建立了测定钴的新方法。在pH 8.0 NH3-NH4Cl缓冲溶液中,钴与2,5-二(邻羟苯基)-1,3,4-噻二唑反应生成1∶3黄绿色螯合物,最大吸收波长为410 nm。加入OB-2后,使其最大吸收波长红移至470 nm,表观摩尔吸光系数为5.74×104L.mol-1.cm-1,钴质量浓度在0.2~2.4μg/mL范围内服从比耳定律,可用于维生素B12针剂和水样中钴的测定,回收率在97.7%~98.2%之间。更多还原

【Abstract】 A spectrophotometric method for determination of cobalt with 2,5-di（2-phenol）-1,3,4-thiadiazole is described.In a medium of pH 7.0～9.0 cobalt reacts with 2,5-di（2-phenol）-1,3,4-thiadiazole to form a 1∶3 complex in the prescence of OB-2.The molar absorptivity is 5.74×10⁴ L·mol^-1·cm^-1 at 470 nm.Beer′s law is obeyed for Co in the range of 0.2～2.4 μg/mL.Trace amounts of Cobalt in VB₁₂ and environmental water samples have been determined by proposed method and the results obtained are satisfactory.更多还原