The water was reacting with the ferrous iron in the tank.
水箱中的铁质产生化学反应。
Main raw materials: amino acid chelate trace elements, glycine zinc, ferrous iron, manganese, vitamin C carrier: lactose, starch, beef powder.
主要原料：氨基酸螯合微量元素，甘氨酸锌，甘氨酸亚铁，蛋氨酸锰，维生素C 载体：乳糖，淀粉，牛肉粉。
The assay is based upon formation of a complex between Xylenol Orange and ferric iron, which is produced by the peroxide dependent oxidation of ferrous iron.
检测方法基于二甲酚橙和三价铁形成的复合物显色反应，而三价铁由过氧化物氧化二价铁得到。
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