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稀土-镁球墨铸铁中稀土总量和镁元素的测定,一般采用光谱法测定镁;各种有机溶剂萃取或沉淀分离法测定稀土总量。这些方法都不能作快速连续测定。我们在络台滴定法测定镁的基础上,试验了对稀土总量作连续测定。在三乙醇胺存在下,用氢氧化钠分离镁和稀土元素。钙,钛对镁和稀土的测定有干扰,用 EDTA 和过
Rare earth - magnesium nodular cast iron in total rare earths and magnesium determination, the general method for the determination of magnesium spectrophotometry; various organic solvent extraction or precipitation method for the determination of total rare earth. None of these methods make rapid and continuous determinations. On the basis of the determination of magnesium by thermometry, the continuous determination of the total amount of rare earth was tested. Magnesium and rare earth elements are separated with sodium hydroxide in the presence of triethanolamine. Calcium, titanium on the determination of magnesium and rare earth interference, with EDTA and too