摘要
基于氢氧化钠介质中痕量钴对过氧化氢氧化偶氮胭脂红Ｂ的褪色反应的强烈催化作用，建立了催化光度法测定痕量钴的新方法。方法灵敏度为５．２４×１０－１２ｇ／ｍＬ，测定范围为０～３５ｎｇ／１０ｍＬ，对质量浓度为３μｇ／Ｌ的Ｃｏ（Ⅱ）重复测定１１次的相对标准偏差为２．１６％。测得褪色反应的表观活化能为１４５．９０ＫＪ／ｍｏｌ。方法应用于维生素Ｂ１２和矿泉水中痕量钴的测定，结果满意。
new catalytic
spectrophotometric method for the determination of trace cobalt has been established. It is
based on the fact that cobalt() can catalyze the oxidation of azocarmine B by H2O2 in
NaOHmedium.The sensitivity of the method is 5.2410-12 g/ml and the rangeof determination is
035 ng/10mL for cobalt(). The relative standard deviation is 2.16%(for 30ng/10mL
Co(),n=11).This method has been applied to the determination of cobalt in vitamin B12 and
mineral water with satisfactory results.
出处
《分析试验室》
CAS
CSCD
1999年第4期73-75,共3页
Chinese Journal of Analysis Laboratory
关键词
催化光度法
偶氮胭脂红B
钴
测定
Catalytic spectrophotometry
azocarmine
B
cobalt determination
