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我们曾先后试验了数种荧光酮类试剂与钯的显色反应。在阳离子表面活性剂存在下,钯与该类显色剂均能生成灵敏度高、稳定性好的三元络合物,用于光度测定钯取得了满意的结果。因此,本文又继续研究了一新型荧光酮试剂对溴基苯基荧光酮,在表面活性剂溴化十六烷基三甲铵存在下,与钯(Ⅱ)的络合反应。在pH6.6～8.4的磷酸盐缓冲溶液中,得到灵敏度较高、稳定性较好的显色体系,最大吸收波长为598nm,表观摩尔吸光系数ε_(598)=9.3×10~4L·mol~(-1)·cm~(-1)。使用巯基棉分离富集钯,选择性较好。用于钯测定,方法准确、迅速,对钯催化剂中的钯进行测定,并与感耦等离子体法、原子吸收光谱法相对照,结果吻合。
We have tested the color reaction of several fluoroketone reagents with palladium in succession. In the presence of cationic surfactants, palladium and these color reagents can produce ternary complexes with high sensitivity and good stability, and satisfactory results have been obtained for the photometric determination of palladium. Therefore, in this paper, we continue to study a new fluorone reagent, p-bromophenylfluorone, in the presence of surfactant cetyltrimethylammonium bromide and palladium (Ⅱ) complexation reaction. In the pH6.6 ~ 8.4 phosphate buffer solution, a high sensitivity and good stability was obtained. The maximum absorption wavelength was 598 nm, the apparent molar absorptivity ε 598 was 9.3 × 10 4 L · mol ~ (-1) · cm ~ (-1). The use of mercapto-cotton separation and enrichment of palladium, the selectivity is better. For the determination of palladium, the method is accurate and rapid, and the palladium in palladium catalyst is determined. The results are in good agreement with the inductively coupled plasma method and atomic absorption spectrometry.