4,6-二溴-2-羧酸偶氮羧与钯显色反应的研究

Studies on the Color Reaction of Pd(Ⅱ) with 4,6-Dibromo-2-Carboxyazo

研究了 pH =2 5时 4,6 二溴 2 羧酸偶氮羧与钯的显色反应。该络合物的最大吸收波长为 5 6 5nm ,其摩尔吸光系数ε为 3 3× 10 4 l·mol-1·cm-1,该方法具有较高灵敏度及选择性 ,Pd(Ⅱ )含量在 0～ 12 μg·2 5ml-1范围内符合比尔定律。该方法用于含钯催化剂中钯的测定 。

In this paper,the color reaction of Pd(Ⅱ) with 4,6 dibromo 2 carboxyazo in pH=2.5 medium has been studies. The complex has a maximum absorption at 565 nm with an apparent molar absorptivity of 3.3×10 4 l ·mol -1 ·cm -1 .The color reaction has good sensitivity and selectivity,and can be utilized for the spectrophotometric determination of Pd(Ⅱ) in catalysts containing Pd(Ⅱ).