钯(Ⅱ)与二溴对甲基偶氮甲磺显色反应的研究

Study on the Colour Reaction of Pd(Ⅱ)-3-[(2,6-dibromon-4-methyiphenyl)azo]-6-[(4-methyl-2-sulfophenyl)azo]-4,5-dihydroxynaphthalene-2,7-disulfonic dcid

钯(Ⅱ)与二溴对甲基偶氮甲磺在硝酸介质中形成组成比为1:2的绿蓝色的配合物,其最大吸收波长位于620nm处,表观摩尔吸光系数ε620=4.2×104L·mol-1·cm-1,钯的质量浓度在0.00～0.80mg·L-1范围内符合比尔定律.该法常温下可在水相中直接测定微量钯,并应用于废钯催化剂回收液中钯含量的测定.

In this paper, the colour reaction and application of Pd（ Ⅱ ）-3-[-（2,6-dibromon-4-methyiphenyl） azo-]-6-[-（4-methyl-2-sulfophenyl） azo-] 4,5-dihydroxynaphthalene-2,7-disulfonic acid were studied. Beer＇s law is obyed for Pd（ Ⅱ ）in the range of 0. 0-0.80mg·L^-1 ,the molar absorptivity is 4.2×10^4L·mol^-1·cm^-1 at 620nm. It provide a new method for the determination of trace Pd（ Ⅱ ）,in water phase and applied to determin. Pd（ Ⅱ ） in recycle of Pd cyclist.