Organic complexes of iron and aluminium in natural waters
Organic complexes of iron and aluminium in natural waters
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DOI：
10.1038/260418a0
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发表时间：
1976-04
期刊：
影响因子：
64.8
通讯作者：
E. Perdue;K. Beck;J. Reuter
中科院分区：
文献类型：
--
作者：
E. Perdue;K. Beck;J. Reuter
在世界各地的天然沃茨中，铁的浓度通常比氢氧化铁的平衡溶解度大几个数量级。高度着色的沃茨（其具有相对高浓度的有机物）通常具有甚至更高的铁浓度。两种化学物质被认为是这种现象的原因：（1）氢氧化铁的细小胶体颗粒（可能与胶体有机物有关）和（2）铁与天然有机物的溶解复合物。虽然胶体氢氧化铁在天然沃茨中的存在被广泛接受3，但几乎没有确凿的证据支持或反对铁的溶解有机络合物的存在。我们希望提出的证据表明，溶解的有机物形成络合物不仅与铁，但也与铝，与铁和铝之间的竞争可用的络合位点确定的相对丰度的两种金属在天然沃茨。
IN natural waters throughout the world1, iron concentrations are commonly several orders of magnitude greater than the equilibrium solubility of iron hydroxide2. Highly coloured waters (which have relatively high concentrations of organic matter) commonly have even greater iron concentrations. Two of the chemical species postulated to account for this phenomenon are: (1) fine colloidal particles of iron hydroxide (possibly associated with colloidal organic matter) and (2) dissolved complexes of iron with naturally occurring organic substances. While the existence of colloidal iron hydroxide in natural waters is widely accepted3, there is little conclusive evidence for or against the existence of dissolved organic complexes of iron. We wish to present evidence which suggests that dissolved organic matter forms complexes not only with iron but also with aluminium, with competition between Fe and Al for available complexing sites determining the relative abundances of the two metals in natural waters.