摘要
在ＰＨ４．８０的弱酸介质中，Ｃｏ（Ⅱ）与５－Ｂｒ－ＰＡＤＡＰ生成有色配合物，酸化后与强酸性阳离子交换树脂交换吸附可进行树脂吸光光度法测定微量Ｃｏ（Ⅱ）。最大吸收工为６１０ｎｍ，表观摩尔吸光系数为３．６×１０＾５，Ｃｏ（Ⅱ）含量在０￣６．５μｇ／２５ｍｌ范围内符合比耳定律。用此法测定天然水和维生素Ｂ１２中Ｃｏ（Ⅱ）含量在结果满意。
In a weak-acid medium of pH 4.80, Co( I ) reacts with 5-Br-PADAP to form a colored com plex. After the color solution is acidified, the color complex can be quantitatively adsorbed on strong acicl cation exchange resin. The maximum absorption wavelength lies at 610nm with an apparent molar absorptivity of 3.6 10~5. Beer's law is obeyed for the concentration of Co( I ) in the range of 0~6. 5μg/25ml. The proposed method has been applied to the determination of trace Co( I ) in natural water and vitamin B_(12) with satisfactory results.
出处
《理化检验（化学分册）》
CAS
CSCD
北大核心
1999年第9期406-407,共2页
Physical Testing and Chemical Analysis(Part B:Chemical Analysis)
基金
内蒙古自然科学基金
