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Eko Hanudin
Balai Penelitian Pertanian Lahan Rawa, Jl. Kebun Karet, Loktabat Utara, Banjarbaru 70712, Kalimantan Selatan
Agriculture, Biological Sciences & Forestry Earth & Planetary Sciences

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Peran Ligan Organik terhadap Pembentukan Oksida Besi di Tanah Sulfat Masam Wahida Annisa; Eko Hanudin
Jurnal Sumberdaya Lahan Vol 7, No 1 (2013)
Publisher : Indonesian Center for Agriculture Land Resource Development

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21082/jsdl.v7n1.2013.%p

Abstract

Abstrak. Besi oksida dalam tanah terdiri atas goetit (α-FeOOH) berwarna kuning/coklat, hematit (α-Fe2O3) berwarna merah, lepidokrosit (γ-FeOOH) berwarna kuning, maghemit (γ-Fe2O3), magnetit (Fe3O4) berwarna hitam dan ferrihidrit (5Fe2O3.9H2O atau Fe5HO8.4H2O) mempunyai tingkat reaktivitas yang berbeda-beda terhadap ion-ion dalam tanah yang dipengaruhi oleh muatan negatif dan positif dari permukaan besi oksida tersebut. Tanah sulfat masam merupakan salah satu jenis tanah di lahan rawa yang memiliki kandungan bahan sulfidik (pirit) cukup tinggi. Oksidasi senyawa pirit di tanah sulfat masam selain memasamkan tanah akan menghasilkan besi (III) koloidal yang kelamaan akan membentuk besi oksida goetit. Keberadaan ligan organik dalam tanah memiliki peranan yang cukup penting terhadap kristalisasi besi oksida dalam tanah. Semakin besar rasio ligan/Fe(II) dalam tanah maka kristalisasi besi oksida semakin terhambat. Pada tanah masam kehadiran ligan sitrat mempengaruhi terhadap sifat permukaan oksida Fe. Keberadaan asam organik yang merupakan ligan organik akan memberikan dampak terhadap pembentukan goetit dan hematit dari ferrihidrite.Abstract. Iron oxides in the soil consisted of goethite (α-FeOOH) with yellow or brown colour, hemathite (α-Fe2O3) with red, lepidocrocite (γ-FeOOH) with yellow, maghemite (γ-Fe2O3), magnetite (Fe3O4) with black and feryhidrite (5Fe2O3.9H2O or Fe5HO8.4H2O) have different levels of reactivity against different ions in the soil which is influenced by positive and negative charge of the surface of the iron oxide. Acid sulphate soil is one of the soils in wetlands that contain higher sulfidic materials (pyrite). Pyrite oxidation in acid sulphate soil is not only increasing acidity but also producing iron (III) colloidal, which over time will form the iron oxide goethite. The presence of organic ligands in soils has an important role to the crystallization of iron oxides in the soil. The greater the ratio of ligand/Fe (II) in the soil greatly inhibited the crystallization of iron oxide. The presence of citrate ligands in acid soils affects the surface properties of Fe oxides. The presence of organic acid as an organic ligand will affect the formation of goethite and hemathite from ferryhidrite.
Peran Ligan Organik terhadap Pembentukan Oksida Besi di Tanah Sulfat Masam Wahida Annisa; Eko Hanudin
Jurnal Sumberdaya Lahan Vol 7, No 1 (2013)
Publisher : Indonesian Center for Agriculture Land Resource Development

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21082/jsdl.v7n1.2013.%p

Abstract

Abstrak. Besi oksida dalam tanah terdiri atas goetit (α-FeOOH) berwarna kuning/coklat, hematit (α-Fe2O3) berwarna merah, lepidokrosit (γ-FeOOH) berwarna kuning, maghemit (γ-Fe2O3), magnetit (Fe3O4) berwarna hitam dan ferrihidrit (5Fe2O3.9H2O atau Fe5HO8.4H2O) mempunyai tingkat reaktivitas yang berbeda-beda terhadap ion-ion dalam tanah yang dipengaruhi oleh muatan negatif dan positif dari permukaan besi oksida tersebut. Tanah sulfat masam merupakan salah satu jenis tanah di lahan rawa yang memiliki kandungan bahan sulfidik (pirit) cukup tinggi. Oksidasi senyawa pirit di tanah sulfat masam selain memasamkan tanah akan menghasilkan besi (III) koloidal yang kelamaan akan membentuk besi oksida goetit. Keberadaan ligan organik dalam tanah memiliki peranan yang cukup penting terhadap kristalisasi besi oksida dalam tanah. Semakin besar rasio ligan/Fe(II) dalam tanah maka kristalisasi besi oksida semakin terhambat. Pada tanah masam kehadiran ligan sitrat mempengaruhi terhadap sifat permukaan oksida Fe. Keberadaan asam organik yang merupakan ligan organik akan memberikan dampak terhadap pembentukan goetit dan hematit dari ferrihidrite.Abstract. Iron oxides in the soil consisted of goethite (α-FeOOH) with yellow or brown colour, hemathite (α-Fe2O3) with red, lepidocrocite (γ-FeOOH) with yellow, maghemite (γ-Fe2O3), magnetite (Fe3O4) with black and feryhidrite (5Fe2O3.9H2O or Fe5HO8.4H2O) have different levels of reactivity against different ions in the soil which is influenced by positive and negative charge of the surface of the iron oxide. Acid sulphate soil is one of the soils in wetlands that contain higher sulfidic materials (pyrite). Pyrite oxidation in acid sulphate soil is not only increasing acidity but also producing iron (III) colloidal, which over time will form the iron oxide goethite. The presence of organic ligands in soils has an important role to the crystallization of iron oxides in the soil. The greater the ratio of ligand/Fe (II) in the soil greatly inhibited the crystallization of iron oxide. The presence of citrate ligands in acid soils affects the surface properties of Fe oxides. The presence of organic acid as an organic ligand will affect the formation of goethite and hemathite from ferryhidrite.
Co-Authors Wahida Annisa