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微量铌的测定多用吸光光度法进行。采用pAR和二甲酚橙光度法测定低合金钢中微量铌,当含量较低时,不分离基体元素,仍有结果不稳定的现象。文献介绍了极谱催化波法测定矿石中痕量铌。我们参照了该方法的底液条件,结合低合金钢的特点拟定了本方法。一仪器与试剂丁士莱(Tinsley)MKl9/4型笔录式极谱仪,银棒阳极: 苯羟乙酸(苦杏仁酸)溶液:0.40M; 四甲基溴化铵溶液:0.50M; 铌标准溶液:(1)贮备液-于瓷坩埚中预置1克焦硫酸钾细粉,然后称取0.0716克Nb_2O_5,再盖上1克焦硫酸钾细粉,加热熔融,持续30至40分钟,使熔解完
Determination of trace niobium with more spectrophotometry. Using pAR and xylenol orange photometric method for the determination of trace niobium in low alloy steels, when the content is low, the result is not stable even if the matrix elements are not separated. The literature describes the polarographic catalytic wave method for the determination of trace niobium ore. We refer to the method of bottom liquid conditions, combined with the characteristics of low-alloy steel developed the method. An Instrument and Reagent Tinsley MKl9 / 4 Transcription Polarograph, Silver Rod Anode: Benzoic Acid (Mandelic Acid) Solution: 0.40 M; Tetramethylammonium Bromide Solution: 0.50 M; Niobium Standard Solution: (1) stock solution- preset 1 g of potassium pyrosulfate fines in a porcelain crucible, then weigh 0.0716 g of Nb 2 O 5 and cover with 1 g of potassium pyrosulfate fines for heating and melting for 30 to 40 minutes Melt finished