Its good and working cheap ... Add 3.25 ml of NaOH when u do calcium to hide the Mg cuz at 1300 ppm of Mg u need 0.13 gm sodium to precipitate it as hydroxide
And good luck do not use manganese as he said its not correct cuz at pH 10 the formation constant of magnsium indicator is high than calcium indicator and it will give red blue color after EDTA strip all calcium and magnesium also its good
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