摘要
研究了钴 (Ⅱ )离子在碱性介质中催化H2 O2 氧化 2 ,2′ 二甲基 4 ,4′ 二氨基联苯 (o Tolidine)的显色反应 ,发现当Co2 +浓度在 0 8～ 3 6ng mL时具有强烈的催化显色作用 ,而当Co2 +浓度在 0 0 4～0 2 4 μg mL时则对显色作用具有抑制效应。基于此研究了测定痕量Co(Ⅱ )离子的影响因素 ,建立了测定痕量Co2 +离子的催化光度法。测定的线性范围Co(Ⅱ )的浓度在 0 0 4～ 0 2 4 μg mL时 ,灵敏度为 3 1 6× 1 0 -6g L ;Co(Ⅱ ) 0 8～ 3 6ng mL时 ,灵敏度为 1 78× 1 0 -6g L。实验操作简便 ,应用于工业污水中痕量Co2 +离子的监测 ,结果满意。
Cobalt(Ⅱ) in NaOH(a.q.) can catalyze the color reaction resulting from the oxidation of \%o\%-Tolidine by H 2O 2.A catalytic photometry for determining trace Co(Ⅱ) was developed and the factors affecting the reaction rate were investigated.It was found that Co(Ⅱ) could intensely catalyse the color reaction in the concentration range of 0 8～3 6ng Co(Ⅱ)/mL and inhibit the color reaction in the concentration range of 0 04～0 24μg Co(Ⅱ)/mL.The sensitivity of the method is 1 78×10 -6 g/L and 3 16×10 -6 g/L when the linear respondence is in the range of 0 8～3 6ng/mL and 0 04～0 24μg/mL respectively.This method has been used to determine trace Co(Ⅱ) in wasted water samples.It is simple and accurate.
出处
《化学通报》
CAS
CSCD
北大核心
2001年第5期309-311,292,共4页
Chemistry
