摘要
合成了新显色试剂7-[6-甲氧基-(2-苯并噻唑偶氮)]-8-羟基喹啉-5-磺酸.该试剂在弱酸性(pH5.0)条件下,在有非离子表面活性剂存在时,与钴形成紫红色的络合物.其最大吸收波长λ_(max)=560nm,表观摩尔吸光系数为6.17×10~4L·mol^(-1)·cm^(-1).钴含量在0～8μg/10ml范围内服从比耳定律.应用拟定的方法测定了维生素B^(12)等试样中的钴,结果满意.
The synthesis of the new color reagent 6-MeO-BTAQS and its color reaction with Co(Ⅱ) are reported in this paper. It is found that the new reagent reacts with Co(Ⅱ) to form a stable complex with a mole ratio of Itol in a weakly acidic solution of pH 5. 0 in the presence of Tween-80. The absorption maxima of the complex is found to lie at 560nm with a molar absorptivity of 6. 2×104L ·mol-1·cm-1. Beer's law holds over the concentration range of 0-8μg/10ml. The proposed method has been applied to the determination of microamounts of Co ( Ⅱ ) in vitamin B12 and in water.
出处
《理化检验（化学分册）》
CSCD
北大核心
1999年第6期251-253,共3页
Physical Testing and Chemical Analysis(Part B:Chemical Analysis)
