摘要
研究了以５－Ｂｒ－ＰＡＤＡＰ或３，５－Ｂｒ２－ＰＡＤＡＰ为指示剂，在ｐＨ６．０～６．５的六次甲基四胺介质中，用ＴＴＨＡ络合返滴定钴。实验表明，采用锌盐为返滴剂，在终点时有着非常敏锐、清晰的颜色变化，钴的检测范围为０．５～５０ｍｇ／５０ｍＬ。方法完全适用于钴合金、氧化钴、钴铁及钴电解液等中钴的测定，相对标准偏差＜１．５０％（ｎ＝５）。
A new method of complexometric back titration of cobalt with TTHA using 5BrPADAP or 3,5Br2PADAP as the indicator at pH6.0～6.5 in hexamethylenetetramine medium has been studied.It is shown that the colour change is very sensitive and the analytical results are stable and accurate for cobalt in the range of 0.5～50mg/50mL.The interfering ions were separated using sodium nitritepotassium chloride mixed solution.The recovery of cobalt as potassium cobaltinitrite precipitate is above 99.5%.The method has been applied to determine cobalt in cobalt alloys,cobalt oxide,cobaltiron alloys and cobalt electrolyte.
出处
《分析试验室》
CAS
CSCD
1998年第2期33-35,共3页
Chinese Journal of Analysis Laboratory
关键词
TTHA
钴
亚硝酸钴钾
配合返滴定
TTHA
complexometric back titration
cobalt
potassium cobaltinitrite
