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甲基百里酚蓝(MTB)作为镁的显色剂测定微量镁已有报导,但未见其应用于钙的测定。而MTB与钙也有良好的显色性能,本文提出在MTB与钙镁同时显色后,加入EGTA,利用其对钙镁络合物稳定常数的差别,仅使钙褪色,藉以连续比色测定试样中的钙和镁。方法特别适用于铝土矿等钙镁含量大致相当的试样中低含量钙镁的测定。一、主要试剂MTB(0.15%) 0.15克MTB和1克盐
Methylthymol blue (MTB) has been reported as a chromogenic reagent for the determination of magnesium in magnesium, but its application to the determination of calcium has not been reported. MTB and calcium also have good color rendering properties. In this paper, we propose to add EGTA after MTB and calcium and magnesium are colored at the same time. By using the difference of the stability constants of calcium and magnesium complexes, only calcium fade, Sample of calcium and magnesium. The method is especially suitable for the determination of low content of calcium and magnesium in the sample with roughly equivalent content of calcium and magnesium. First, the main reagent MTB (0.15%) 0.15 g MTB and 1 g salt