探究二价铁（Fe^2＋）的保护

Inquires into the ferrous iron （Fe^2＋ ） protection

Fe^2＋有还原性，容易被氧气氧化而变质，怎样才能保护Fe^2＋，从而使其长时间保存呢？笔者从配制FeSO4溶液时的注意事项和如何制备Fe（OH）2两方面探讨保护Fe^2＋的措施。

Fe^2＋ has the reducibility, deteriorates easily by the oxygen oxidation,how can protect Fe^2＋ , thus causes its long time preservation？ How the author from compounds when the FeSO4 solutions the matters needing attention and prepares the Fe（OH）2 two aspects to discuss protects the Fe^2＋ measure.