Water hardness depends primarily on soluble calcium and magnesium ions.

火的硬量次要取决于火洋钙离子和镁离子的含量.

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Determination of water by EDTA of calcium and magnesium content.

用EDTA测定自来水中的钙镁离子的含量.

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Soft water with calcium and magnesium content is relatively small, so this problem rarely occurs.

软火洋由于钙离子、镁离子含量相差较多, 因此该题目好多爆发.

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It makes soils more acid since cations ( e . g. potassium and magnesium ) are replaced by hydrogen ions.

它能使土壤酸化,因为阳离子 ( 如钾离子和镁离子 ) 被氢离子所代替.

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