The major existence form of iron in CO2-type mineral water is Fe2+,which constitutes one of the most important biologically active components in these waters.

• 铁元素氧化还原体系是影响天然水环境化学性质的重要因素，碳酸水生物活性组分之一的二价铁离子，是此类矿水中铁元素主要存在形式。