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以络合滴定法测定中间合金中稀土总量与镁,通常需用沉淀分离干扰元素,这种方法繁琐费时。下面介绍一种简便、快速而又准确的络合滴定法。经初步试验证明,在其它掩蔽剂如苦杏仁酸(对铁),磺基水杨酸(对钍),乙酰丙酮(对铝)以及硼酸的存在下,稀土金属可用氟离子从其 EDTA 络合物置换出来,而获得滴定的选择性。镁以过量的酒石酸盐消除铁、铝、钍、钛、铈等的干扰,锰、稀土、
The complexation titration method for the determination of the total amount of rare earths in the master alloy and magnesium usually requires precipitation and separation of interfering elements. This method is cumbersome and time-consuming. Here’s a simple, fast and accurate complexometric titration. Preliminary tests have shown that rare earth metals can be complexed with their fluoride from EDTA in the presence of other masking agents such as mandelic acid (iron), sulfosalicylic acid (thorium), acetylacetone (aluminum to aluminum), and boric acid The substance is displaced out and the titration selectivity is obtained. Magnesium with excess tartrate to eliminate the interference of iron, aluminum, thorium, titanium, cerium, manganese, rare earth,