The interaction of a soil fulvic acid with precipitating hydrous ferric oxide at pH = 6
The interaction of a soil fulvic acid with precipitating hydrous ferric oxide at pH = 6
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pH = 6 时土壤黄腐酸与沉淀水合氧化铁的相互作用
DOI：
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发表时间：
1981
期刊：
影响因子：
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通讯作者：
A. W. Underdown
中科院分区：
文献类型：
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作者：
C. Langford;S. Wong;A. W. Underdown
基于分光光度法监测铁（II）与铁（III）的反应，建立了一种区分铁（II）与铁（III）以及不同不稳定性的铁（III）形式的动力学分析方法。用盐酸羟胺还原铁（III）使单一比色试剂可以检测所有形式的铁。该方法用于研究表征良好的可溶性土壤有机酸样品（黄腐酸）在pH = 6的条件下对铁（III）形态的影响，其中铁（III）在没有黄腐酸的情况下形成胶体水合氧化物。黄腐酸的作用是大大提高铁（III）的不稳定性相比，在含水氧化物胶体。然而，超滤和光散射实验表明，Fe(III) -黄腐酸比含水氧化铁胶体颗粒更大。动力学研究表明，在没有盐酸羟胺的情况下，黄腐酸在铁（II）络合物存在下可以作为铁的还原剂。
A kinetic method of analysis which distinguishes Fe(II) from Fe(III) and Fe(III) forms of various labilities from each other is based on spectrophotometric monitoring of the reaction of Fe(II) with ferrozine. Reduction of Fe(III) with hydroxylamine hydrochloride allows the single colourimetric reagent to detect all forms of Fe. The method is applied to study of the effects of a well characterized soluble soil organic acid sample, a fulvic acid, on the speciation of Fe(III) under conditions (pH = 6) where Fe(III) forms a colloidal hydrous oxide in the absence of fulvic acid. The effect of fulvic acid is to greatly increase the lability of Fe(III) compared to that in a hydrous oxide colloid. However, ultrafiltration and light scattering experiments indicate that the Fe(III) – fulvic acid species is larger than the hydrous ferric oxide colloid particles. Kinetic studies in the absence of hydroxylamine hydrochloride show that fulvic acid can act as a reducing agent for iron in the presence of an Fe(II) comple...