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比色法测定镁的试剂目前已有十余种,把它们归结为三类:试剂与镁离子形成易溶于水的有色络合物;试剂与氢氧化镁产生有色的吸附化合物;试剂用子萃取-比色测定镁。第一类试剂尤其引起人们的注意。铝合金中微量镁的测定国内多用第二类试剂达旦黄方法,虽然它有着高的灵敏度,但再现性往往不够满意,且需进行碱溶分离与铜试剂分离两次手续。甲基麝香草酚蓝与镁离子可形成易溶于水的稳定有色络
Colorimetric method for the determination of magnesium reagent now has more than ten kinds, they boil down to three categories: reagents and magnesium ions to form a water-soluble colored complex; reagents and magnesium hydroxide to produce colored adsorption compounds; Extraction - colorimetric determination of magnesium. In particular, the first type of reagent has attracted the attention of people. Determination of trace amounts of magnesium in aluminum The domestic use of the second reagent up to yellow method, although it has high sensitivity, but the reproducibility is often not satisfied, and the need for alkali-soluble separation and separation of copper reagent two procedures. Methyl thymol blue and magnesium ions can form a stable, water-soluble coloration