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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.
In this paper, the optimum conditions for the determination of palladium with 5-Br-PADAP in the presence of anionic surfactant (SLS) were studied. The maximum absorption wavelength of complex in 0.04-2mol · dm -3 HCl0-4 medium was 624nm.The molar ratio of Pd (Ⅱ) to 5-Br-PADAP was determined to be 1: 1 by molar ratio method and continuous variation method, Beer’s law was obeyed in the range of 0-20μgPd / 25ml.The molar absorptivity was 4.0 × 10-4l · Mol ~ (-1) · cm ~ (-1) .The method has good selectivity and simple operation, and has been used in the direct determination of trace palladium in the aluminosilicate catalyst. The obtained results are satisfactory.