MECHANISM OF IRON REMOVAL IN ESTUARIES
MECHANISM OF IRON REMOVAL IN ESTUARIES
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DOI：
10.1016/0016-7037(77)90075-8
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发表时间：
1977-01-01
影响因子：
5
通讯作者：
SHOLKOVITZ, ER
中科院分区：
文献类型：
--
作者：
BOYLE, EA;EDMOND, JM;SHOLKOVITZ, ER
美国东海岸河口调查证实，大规模的快速去除铁从河水是一个普遍现象，在河口混合。河流携带的溶解Fe几乎完全由直径小于0.45 μ m的混合氧化铁-有机物胶体组成，其被溶解的有机物稳定。沉淀发生在混合，因为海水阳离子中和带负电荷的铁轴承胶体允许絮凝。在实验室实验中使用天然过滤和未过滤的河水以及在0.05 μ m过滤水中的合成胶体针铁矿重复了该过程。超离心和超滤进一步证实了铁的胶体性质。降水现象的主要结果是使溶解铁向海洋的有效输入减少了约90%的主要河流值，相当于河水的浓度小于1 μ mol/l。
A survey of USA east coast estuaries confirms that large-scale rapid removal of Fe from river water is a general phenomenon during estuarine mixing. The river-borne dissolved Fe consists almost entirely of mixed iron oxide-organic matter colloids, less than 0.45 .mu.m in diameter, stabilized by the dissolved organic matter. Precipitation occurs on mixing because the seawater cations neutralize the negatively charged Fe-bearing colloids allowing flocculation. The process has been duplicated in laboratory experiments using both natural filtered and unfiltered river water and a synthetic colloidal goethite in 0.05 .mu.m filtered water. The colloidal nature of the iron has been further confirmed by ultracentrifugation and ultrafiltration. A major consequence of the precipitation phenomena is to reduce the effective input of dissolved iron to the ocean by about 90% of the primary river value, equivalent to a concentration of less than 1 .mu.mol/l of river water.