Wet chemical analyses of well-mixed fine drillings from a alloyed magnesium ingot showed that the resultant zirconium was a function of the concentration of the hydrochloric or nitric acid that was used to digest the samples while the total could be readily and accurately determined. A solution containing 15 % of concentrated hydrochloric acid was used to determine the soluble zirconium. It was shown that insoluble that existed in the form of undissolved particles could play a positive role (similar to 30 %) in grain-refining magnesium and excellent grain refinement of magnesium alloys by depends on both soluble and insoluble in the melt immediately prior to pouring.
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Qian et al. (2003) studied this question.