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将钢中夹杂物总量挥硅后用焦硫酸钾及碳酸钠-硼酸熔融,水浸后加Na_2O_2以氧化铬至高价,然后过滤以分离用Al_2O_3、Cr_2O_5。沉淀用盐酸酸化后制成溶液。分液调pH至8.0左右,加EDTA-Cu,在水浴中加热到80℃左右,Ca能很快地置换出EDTA-Cu中相应量的Cu、游离Cu则与BCO生成蓝色稳定的络合物。以此能间接地测出CaO含量。少量MgO、TiO_2、MnO的干扰可用合成相同含量的参比液(或用差减法)加以消除。此法的检测下限为1μg。
The total amount of inclusions in the steel after silicon volatilization with potassium pyrophosphate and sodium carbonate - boric acid melt, after flooding add Na 2 O 2 to chromium oxide to high prices, and then filtered to separate with Al_2O_3, Cr_2O_5. The precipitate was acidified with hydrochloric acid to make a solution. Dispense was adjusted to about pH 8.0, add EDTA-Cu, in a water bath heated to about 80 ℃, Ca can quickly replace the corresponding amount of Cu-EDTA-Cu, free Cu and BCO generated blue stable complex Things. In this way can indirectly measure the CaO content. Small amounts of MgO, TiO 2, and MnO can be eliminated by synthesizing the same amount of reference solution (or by subtraction). The detection limit of this method is 1μg.