氧极大通常是属于第一类极大,电流大小表现出遵循欧姆定律。本文报导在低浓度的EDTA存在下,氧极大出现异常现象,电流不再表现出上述性质,而出现阶跃电流。用单扫描示波极谱法获得尖锐的导数峰。试验结果表明,此尖锐导数峰的出现与溶液中存在的EDTA、O_2及某些阴离子有关。当EDTA和O_2浓度固定时,其大小和位置与阴离子性质及浓度有关。我们曾运用这个方法测定了发光材料钨酸钙中的微量氯。 Oxygen maxima usually belong to the first class of maxima, and current sizes appear to follow Ohm’s law. This paper reports that in the presence of low concentrations of EDTA there is a significant anomalous appearance of oxygen, the current no longer exhibits the above properties, and a step current occurs. Obtain sharp derivative peaks with single-sweep oscillopolarography. The experimental results show that the appearance of this sharp derivative peak is related to the presence of EDTA, O 2 and some anions in solution. When the concentration of EDTA and O 2 is fixed, its size and location are related to the nature and concentration of the anion. We have used this method to measure the trace chlorine in the light-emitting material calcium tungstate.