在表面活性剂存在下用 5-Br-PADAP分光光度法测定钯的研究

本文研究了在阴离子表面活性剂(SLS)存在下,用5—Br—PADAP测定钯的最宜条件.在0.04—2mol·dm~(-3)HCl0_4介质中,络合物的最大吸收波长为624nm,用摩尔比法和连续变化法测得Pd(Ⅱ)与5—Br—PADAP的组成为1:1,在0—20μgPd/25ml范围内服从比尔定律.摩尔吸光系数为4.0×10~4l·mol~(-1)·cm~(-1).该方法具有良好的选择性,操作简便,已用于硅铝催化剂中微量钯的直接测定,所得结果满意.

Study on Spectrophotometric Determination of Palladitlm with 5-Br-PADAP in the Presence of Surfactant

'The conditions for colour reaction of palladium with 2-(5-Br-2-Pyri-dylazo)-5-diethylaminophenol in 0.04-2 mol -dm-3 HClO4 solution containing anionic surfactant SLS have been studied. The maximum absorption of the complex is at 624nm,and its apparent molar absorptivity is 4.0X1041mol-1 cm-1. The rnolar ratio of Pd( E ) to 5-Br-PADAP has been established to be 1:1. Beer's law is obeyed for 0-20g/25 ml of Pd.A simple and highly selective method has been successfully applied to the direct determination of palladium content in Pd-containing catalysts without separating Pd from its concomitants.