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钯在 TrionX-100存在下与3,5-Br_2-PADAP 于1.8～4.8mol/1的H_2SO_4溶液介质中形成兰色的络合物,最大吸收峰位于600—610nm,钯含量在0—26μg/10ml 范围内服从比尔定律,表观摩尔吸光系数为4.3×10~4(?)·mol~(-1)·cm~(-1),络合物组成比为 Pd:3,5-Br_2-PDAP=1:1。络合物至少能稳定72小时。本法选择性很好,允许大量锰、钒、锌、钼、镁、铝、锆、铜、钨、钛及铂族元素等共存。本法用于钯活性炭催化剂中钯的测定,获得满意的结果。
Palladium in the presence of TrionX-100 and 3,5-Br_2-PADAP in 1.8 ~ 4.8mol / 1 H_2SO_4 solution medium to form a blue complex, the maximum absorption peak at 600-610nm, palladium content of 0-26μg / Beer’s law was obeyed in the range of 10ml. The apparent molar absorptivity was 4.3 × 10 ~ 4 (?) · Mol ~ (-1) · cm ~ (-1), the complex composition ratio was Pd: 3,5-Br_2- PDAP = 1: 1. The complex can stabilize for at least 72 hours. The law of selectivity is good, allowing a large number of manganese, vanadium, zinc, molybdenum, magnesium, aluminum, zirconium, copper, tungsten, titanium and platinum group elements coexist. The method is applied to the determination of palladium in palladium activated carbon catalyst and obtains satisfactory results.