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Reaksi Pemasaman Senyawa Pirit pada Tanah Rawa Pasang Surut

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Author(s): Bambang Joko Priatmadi | Abdul Haris

Journal: Jurnal Tanah Tropika
ISSN 0852-257X

Volume: 14;
Issue: 1;
Start page: 19;
Date: 2009;
Original page

Keywords: Acid sulfate soils | pyrite | soil acidity

ABSTRACT
Acidity Reaction of Pyrite in Tidal Swampland (B.J. Priatmadi and A. Haris): Most of swamp soils in tidal landare Acid Sulfate Soils. Acid sulfate soils are the common name given to soils containing iron sulfides (pyrite). Thesoils are characterized by very low pH and high amount of soluble S and Fe, resulted from oxidation of pyrite whensoils are drained. This study was aimed to determine acidity pattern, iron and sulfate solubility as the impact of thelength time of oxidized, the effect of inhibitors application to acidity rate of sulfidic materials and top soils. Thematerials are: (1) soils at pyritic layer (sulfidic materials) and (2) soils at 0 – 20 cm from soil surface. Soils issampled at Barambai reclaimed area, Barito Kuala Regency, South Kalimantan Province. In the laboratory soilstreated with some ameliorants, that are silica, phosphate and lime applied with dosage 2 t ha-1 with 3 replicationstimes. The soils incubated for 2 weeks under submerged condition. After soil incubation, soil exposed to the air for1 week, 2 weeks, 4 weeks, and 6 weeks. Parameters of soil analysis include pH, sulfate and iron soluble. Results ofthis study showed that (1) soil acidity rate of sulfidic materials more faster than upper soils when soils and sulfidicmaterials oxidized intensively, (2) at submerged soil condition or high soil water content, the application of ameliorantseffective increasing the soil pH of the upper soils, (3) at further oxidized soil condition or lower soil water content,the application of ameliorants inhibited acidity rate of soils and sulfidic materials, and (4) at further oxidized soilcondition or lower soil water content, the application of ameliorants increased iron solubility of soils and sulfidicmaterials.
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