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矿石中极谱法测铬,主要采用过氧化钠熔矿。然后在1N氢氧化钠中测铬酸根的波。但由于“空白”高,用高铝坩埚和铁坩埚时尤其严重,所以低铬含量无法测定,高含量也因准确度差而不适用。作者对其“空白”高的原因进行探索,发现是氧的第二波干扰引起的。当有较大量的Al(Ⅲ)存在时,氧波峰高增加很多,可达10倍以上。氧波的峰电位也向正移,与铬酸根波接近,波形由宽变为尖锐,故容易被误认为铬酸根的波。作者发现在1N的氢氧化钠中加入酒石酸钾钠可使氧的第二波消失,即使有大量Al(Ⅲ)
Polarographic determination of chromium ore, the main use of sodium ore melting. Chromate waves were then measured in 1N sodium hydroxide. However, due to the “blank” high, with high-alumina crucible and iron crucible particularly serious, so low-chromium content can not be determined, because of the high content of poor accuracy is not applicable. The authors explored the reasons for its “blank” high and found that it was caused by the second wave of oxygen. When a larger amount of Al (Ⅲ) is present, the oxygen peak height increases a lot, up to 10 times more. The peak potential of oxygen wave is also positive shift, and chromate wave close, the waveform changes from broad to sharp, it is easily mistaken for chromate wave. The authors found that the addition of potassium sodium tartrate to 1N sodium hydroxide resulted in the disappearance of the second wave of oxygen even though a large amount of Al (III)