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本报告以5-[(3,5-二溴-2-吡啶)偶氮]-2,4-二氮基甲苯(简称3,5-Br_2-PADAT)为显色剂。以乙醇为增敏剂,研究了 Pd-3,5-Br_2-PADAT-乙醇体系的分光光度性质.实验表明,在0.1～0.6NHCl 范围内,Pd 与3.5-Br_2-PADAT 及 C_2H_5OH 生成稳定的紫色络合物,最大吸收波长在600nm,摩尔吸光系数=1.05×10~5.钯量在0.5～10μg/25ml 符合比尔定律.该络合物中 Pd:3,5-Br_2-PADAT=1:1.用 Zeph-C-2H_4Cl_2:萃取富集矿石中微量钯巴后转为水相测定,可测定0.X～数百克/吨的钯.矿石中常见的39种金属离子不干扰测定.精密度和准确度良好.
This report uses 5 - [(3,5-dibromo-2-pyridyl) azo] -2,4-diazotoluene (referred to as 3,5-Br_2-PADAT) as a developer. Using ethanol as sensitizer, the spectrophotometric properties of Pd-3,5-Br 2 -PADAT-ethanol system were studied.The results showed that Pd and 3.5-Br 2 -PADAT and C 2 H 5 OH produced stable purple color in the range of 0.1 ~ 0.6NHCl The complex has a maximum absorption wavelength at 600 nm and a molar absorptivity of 1.05 × 10 -5. The Beer’s law is obeyed for the amount of palladium in the range of 0.5-10 μg / 25 ml. The Pd: 3,5-Br 2 -PADAT = 1: 1 . With Zeph-C-2H_4Cl_2: extraction enrichment of trace palladium palladium in the ore after the determination of the water phase can be measured from 0. X ~ hundreds of grams / ton of palladium.Organic 39 common metal ions do not interfere with the determination. Degree and accuracy are good.