How to make Standard solution for magnesium, phosphorus, calcium and potasium ?

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Paul Milham

Many people now buy their reference quality standard solutions even if they prepare solutions from solid KCl for K and KH2PO4 for P. These salts can readily be dried before weighing. Mg salts are more problematic because of hydration.

You will also need a reference sample of agreed composition for the tests that you intend to do.