摘要
本文研究了在β-环糊精（β-CD）存在下，用2-（5-溴-2吡啶偶氮）-二乙氨基酚（5-Br-PADAP）与钴显色反应测定钴。显色物最大吸收波长位于585um，钴含量在0～15μg／25mL范围内遵守比耳定律．表观摩尔吸光系数ε585=8.84×104mol·L-1·cm－1。方法操作简便、灵敏、稳定，以EGTA－NH4F-焦磷酸钠联合掩蔽剂可消除大量干扰离子影响，能不经分离直接测定人发中微量钴。
In this paper the author makes a study on the colour reaction between 2 - (5bromo-2 -pyridyazo) -5-diethylaminophenol (5-Br-PANDAP) and cobal (Ⅱ)in β- cyclodextrin (β-CD). The maximum absorption of the colour complex is at 585nm. Beer's lawis obeyed in range of 0 ~15μgCo/25mL.The apparent molar absorption is 8. 84×104L· mol-1 The way of the determination of trace cobalt is simple,sensistive and steady.It can get rie of the influence on many disturbing ions with EGTA-NA4F and sodium pyrospho phate as masking agent,This method needn't seprate from disturbing ions and can directly determine trace cobalt in human hair.
出处
《漳州师范学院学报（自然科学版）》
1999年第3期59-62,共4页
Journal of ZhangZhou Teachers College（Natural Science)
