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在酸性溶液中,高价铁离子还原为亚铁离子,其电位要比汞在阳极的溶解电位为正,而亚铁离子还原为金属铁的波,实际上与氢离子的波重叠,所以测定铁的极谱波,多以配合物形式进行。铁-4-(2-吡啶偶氮)-间苯二酚(Fe-PAR)配合化合物,最早用于光度分析,它的极谱性能未见详细报导。本文试图利用该配合化合物建立极谱测定铁的可能性,考察了影响极谱波的各种因素、波的性质与反应机理。经试验确定的方法,应用于稀土和地质普查样中铁的测定,能满足生产要求。实验部分
In acidic solution, the iron ion is reduced to ferrous ion, the potential is higher than the dissolved potential of mercury in the anode, and the ferrous ion is reduced to the metal iron wave, in fact overlap with the hydrogen ion wave, so the iron The polarographic wave, mostly in the form of complexes. Iron-4- (2-pyridylazo) -resorcinol (Fe-PAR) complex, the earliest for photometric analysis, its polarographic properties have not been reported in detail. In this paper, we attempted to establish the possibility of polarographic determination of iron by using the complex compounds. Various factors affecting the polarographic wave, the nature of the wave and the reaction mechanism were investigated. The test method is applied to the determination of iron in rare earth and geological census samples to meet the production requirements. Experimental part