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在酒石酸、柠檬酸、草酸和其它羟基酸存在时,研究了铌和2-[(5-溴-2-吡啶)偶氮]-5-(二乙氨基)苯酚(简称5-Br-PADAP)的反应。发现在酒石酸(Tar)存在时,使用5-Br-PADAP测定铌得到最好的结果。 本文用吸光光度法研究蓝色的铌-(5-Br-PADAP)-Tar的混合型络合物。在PH为1.0-4.0范围600毫微米处,此蓝色络合物有最大的吸收。摩尔吸光系数是5.7×10~4。用两种不同的方法研究混合型络合物的组成,Nb:5-Br-PADAP:Tar=1:1:1。 在pH为1.0时,Nb的浓度1—32微克/25毫升范围内遵从比尔定律。本文提出高灵敏度和高选择性的吸光光度法测定合金钢中的微量铌。
In the presence of tartaric acid, citric acid, oxalic acid and other hydroxy acids, the effects of niobium and 2 - [(5-bromo-2-pyridyl) azo] -5- Reaction. The best results were obtained with niobium using 5-Br-PADAP in the presence of tartrate (Tar). In this paper, the blue niobium - (5-Br-PADAP) -Tar mixed complex was studied by spectrophotometry. The blue complex has the greatest absorption at 600 nm at a pH of 1.0-4.0. The molar extinction coefficient is 5.7 × 10 -4. The composition of the mixed complex was studied in two different ways, with Nb: 5-Br-PADAP: Tar = 1: 1: 1. Beer’s law is obeyed at a concentration of 1 to 32 μg / 25 ml of Nb at a pH of 1.0. In this paper, high sensitivity and high selectivity spectrophotometric determination of trace niobium in alloy steels are proposed.