引用本文:邵宗臣,陈家坊.几种氧化铁的离子吸附特性研究[J].土壤学报,1984,21(2):153-162. DOI:
Shao Zongchen,Chen Jiafang.STUDY ON ION ADSORPTION CHARACTERISTICS OF SOME IRON OXIDES[J].Acta Pedologica Sinica,1984,21(2):153-162. DOI:
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几种氧化铁的离子吸附特性研究
邵宗臣, 陈家坊
中国科学院南京土壤研究所
摘要:
氧化铁是土壤中常见的氧化物,其中较为普遍的是针铁矿和赤铁矿,在某些土壤中也含有纤铁矿和无定形氧化铁.它们通常以极小的颗粒单独存在,或以胶膜状包裹在其它矿物颗粒的外面,有较大的比表面积,易受环境的影响,因此具有较高的活性,并对许多土壤的物理化学性质产生重要的影响.某些重金属离子和某些污染物进入土壤后的动向和行为也深受土壤中氧化铁的影响.
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STUDY ON ION ADSORPTION CHARACTERISTICS OF SOME IRON OXIDES
Shao Zongchen, Chen Jiafang
Institute of Soil Science, Academia Sinica, Nanjing
Abstract:
The present paper deals with the surface properties of some iron oxides by means of the equilibrium of iron oxides with 0.01N NH4Cl solution.The results showed that surface charge of iron oxide was closely related with the pH.Positive charge of iron oxides (represented by Cl- ion adsorbed) was significantly negatively correlated with the pH,but negafive charge (represented by NH4+ ion adsorbed) was positively correlated with the pH.For synthetic iron oxides,the zero point of charge (ZPC) obtained when the adsorption capacity of counterions was equal to zero approximated that obtained from the potentiometric titration.Basic property of surface hydroxyl of iron oxide showed buffering effect on the H+ ions in acid NH4Cl solution.
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