表面活性剂存在下变色酸偶氮羧试剂与铬(Ⅵ)的褪色反应

The Fading Reaction of m-Carboxy-Carboxyazo or Carboxyazo I with Chromium (Ⅵ) in the Presence of Surfactant

研究了变色酸偶氮羧类试剂(间羧基偶氮羧、偶氮羧I)与铬(Ⅵ)反应的影响因素。实验结果表明:在HNO3介质中,在表面活性剂存在下,上述试剂与铬(Ⅵ)具有高灵敏的褪色反应,摩尔吸光系数e=2.9×105 L·mol-1·cm-1(偶氮羧I:e=9.8×104)。

The effect on the reaction of carboxyazo I or m-carboxy-carboxyazo with chromium(Ⅵ) was studied. In the presence of surface active agent and in the medium of nitric acid, the reaction has high sensitivity, and the molar absorptivities were 9.8 × 104 L·mol-1· cm-1 and 2.9 × 105 L·mol-1·cm-1 , respectively.