prov:value
| - m and calcium, in particular magnesium and calcium salts, for example Mg(OH)2, MgCO3, MgSiO4, CaSO4, CaCO3, alkaline earth metal oxides, for example MgO and CaO, other inorganic phosphates and sulfates, for example ZnSO4, salts of organic acids, in particular their alkali metal and alkaline earth metal salts and specifically their sodium and potassium salts, for example the acetates, formates, hyd
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