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络合滴定法测定钙镁,对干扰离子铁锰的分离或掩蔽还缺少理想的方法。现虽有人用亚铁氰化钾沉淀掩蔽铁和锰,但不少条件尚有不妥之处,分析误差较大。本文对亚铁氰化钾掩蔽铁锰,用EDTA测钙镁的酸度等测定条件进行了试验,建立了新的分析方法,能在大量铁锰存在下,对炉渣、矿渣等样品的钙镁进行简便、快速、准确的测定。 一、溶样 取0.6000g样品于烧杯中,加10ml 6MHCl,加热近干,再加15～20ml王水,加热近干,用2M HCl浸取,趁热过滤,以水定容于250ml容量瓶中。
Complexometric titration of calcium and magnesium, the interference of iron and manganese separation or masking is still an ideal method. Although some people use potassium ferrocyanide precipitation masking iron and manganese, but many conditions are not the right place, the analysis of errors. In this paper, ferromanganese ferricyanide masking iron and manganese, calcium EDTA by measuring the acidity of the determination of the test conditions, the establishment of a new analytical method, in the presence of a large number of iron and manganese, slag, slag and other samples of calcium and magnesium Simple, fast and accurate determination. First, the sample taken 0.6000g dissolved in a beaker sample, add 10ml 6MHCl, heated nearly dry, plus 15 ~ 20ml aqua regia, heated nearly dry, with 2M HCl leaching, filtered hot, water to 250ml volumetric flask in.