在地壳中,铁的丰度仅次于氧、硅、铝而居笫四位,并以多种价态存在。铁在自然界能被氧化也能被还原的性质,对铁本身及有关元素的行为有着重要的影响。大家知道,在沉积岩、表生矿床、风化壳和土壤 In the earth’s crust, the abundance of iron ranks second only to oxygen, silicon and aluminum, and exists in many valence states. The nature of iron, which can be oxidized and reduced in nature, has an important effect on the behavior of iron itself and related elements. We all know that in sedimentary rocks, epigenetic deposits, weathering crusts and soils