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我公司测定钼精矿中钙,一直沿用五十年代的高锰酸钾容量法,此法中草酸钙沉淀溶度积较大(Ksp=4×10~(-8)),不利于定量分离:高锰酸钾标准溶液也不稳定,干扰因素多,早已为多数实验室所不用。六十年代广泛采用 EDTA 络合滴定法,此方法指示剂终点敏锐,并可实现钙镁连续测定,有一定优越性,至今测定高品位样品仍然使用。分析手续较繁锁,不适宜低含量钙镁的测定是其不足。七十年代初,国内原子吸收光谱分析技术发展迅速,用原子吸收法测定钙镁报导很多。并已广泛应用于冶金。
My company measured the molybdenum concentrate calcium, has been used in the fifties potassium permanganate capacity method, the method of calcium oxalate precipitation solubility product (Ksp = 4 × 10 -8), is not conducive to quantitative separation : Potassium permanganate standard solution is also unstable, many disturbing factors, long for most laboratories do not. Sixty’s widely used EDTA complexometric titration method, the endpoint of this method is acute, and can achieve continuous determination of calcium and magnesium, there are some advantages, so far the determination of high-grade samples are still used. Analysis procedures more complex lock, not suitable for the determination of low levels of calcium and magnesium is its deficiency. The early seventies, the rapid development of domestic atomic absorption spectrometry technology, calcium and magnesium by atomic absorption method reported a lot. And has been widely used in metallurgy.