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钼在檸檬酸鈉的中性溶液中,或MoS+4在Ba(OH)_2及NaOH的硷性溶液中都产生还原波,且能定量。在酸性基底液中钼的极譜性質前人已研究得很多,但以硫酸和弱酸的混合酸作基底液的研究得较少。R.L.Pecsok曾提出以0.1M硫酸-0.5M檸檬酸为测定钼的基底液,并分析了钢样,在此底液中測定钼的浓度范圍較小(5×10~(-3)-10~(-4)M),同时还需严格控制酸度等条件,他又用阳离子交换剂分离溶液中阳离子,故对干扰离子未曾試驗。我们选择硫酸草酸为测定钼的基底液的原因是:
Molybdenum in sodium citrate neutral solution, or MoS + 4 in Ba (OH) _2 and NaOH alkaline solution produces reduction wave, and can be quantified. The polarographic properties of molybdenum in acid base solution have been studied a lot before, but the mixed acid with sulfuric acid and weak acid as the base fluid less. RLPecsok proposed to use 0.1M sulfuric acid - 0.5M citric acid as a base solution for the determination of molybdenum, and analyzed the steel sample, in which the molybdenum concentration measured in the range of smaller (5 × 10 ~ (-3) -10 ~ (-4) M). At the same time, it is necessary to strictly control the acidity and other conditions. In addition, the cation exchangers are used to separate the cations from the solution, so that the interference ions have not been tested. The reason we chose oxalic acid for the determination of basal fluid of molybdenum is: