稀土元素在工业生产上的应用日益广泛,我省已用于球墨铸铁及白口铁中。但目前测定稀土总量所用的方法,大都是氟化物及草酸盐重量法。此法很繁,工作周期又长,不能满足生产上的需要。乙醚法是一个快而准的方法,但由于气候关系在南方不能应用(特别在夏季)。为了弥补这一不足,我们参照了上海材料研究所的球墨铸铁中镁的络合滴定法,试验出一种在三乙 Rare earth elements in the industrial production of the increasingly widespread application, our province has been used for ductile iron and white iron. However, the current method of measuring the total amount of rare earths, mostly fluoride and oxalate gravimetric method. This method is very complicated, long working cycle, can not meet the production needs. The ether method is a fast and accurate method, but it can not be applied in the South due to the climate relationship (especially in summer). In order to make up for this deficiency, we refer to the complexation titration of magnesium in ductile iron of Shanghai Institute of Materials,