钯(Ⅱ)与偶氮氯膦Ⅲ的显色反应测定微量钯的研究及应用

Study on the Color Reaction of Palladium with Chlorophosphonazo Ⅲ and Its Application

中文关键词:  钯  偶氮氯膦Ⅲ  分光光度法

英文关键词:Palladium  Chlorophosphonazo Ⅲ  Spectrophotometry

中文摘要:

      钯(Ⅱ)与偶氮氯膦Ⅲ在硫酸介质中可形成1:1的蓝色配合物,其最大吸收波长位于644nm处,表观摩尔吸光系数ε₆₄₄=2.4×10⁴L/(mol·cm),钯含量在0.1～1.5mg/L范围内符合朗比定律.该法简便、快速,可在水相中直接测定微量钯.用于含钯精矿、阳极泥等样品中钯含量的测定,结果满意.

英文摘要:

      The color reaction between palladium and chlorophosphonazo Ⅲ has been studied. It was found that palladium reacts with chlorophosphonazo Ⅲ to form a 1:1 blue complex in H₂SO₄ medium. The complex exhibits a maximum absorption at 644 nm with an apparent molar absorptivity of 2.4×10⁴ L/(mol·cm). Beer's law is obeyed in the range of 0.1～1.5 mg/L Pd(Ⅱ). The method proposed was applied to the determination of palladium in refined ore and anode mud samples with satisfactory results.