Generation of acidity by pyrit oxidation in inland acid sulphate soils of warm climate

Generación de acidez por oxidación de pirita en suelos sulfatados ácidos interiores de clima cálido

The study was done in acid sulphate soils in the Mid and Low Sinu river valley (Cordoba). There is not quantitative information that allows knowing the environmental impact of acidification from pyritic exposure on wetlands. A transect between San Carlos and Cotorra municipalities was established and eight sites were selected. The ASSMAC in Acid Sulphate Soils Analytical Methods, by POSA and TSA technical methodologies were used. The variables were TAA and TPA for each one of the soils horizons. The results showed that sulfur is between 202 to 4800 mg kg^-1. TAA was 112 y 604 Kg ha^-1 of H+ in El Deseo while El Sabanal and Besito Volao did not show any amount. APT on potential acid sulphate soils can generate around 99.745,7 Kg ha^-1 of H₂SO₄ and 45.689 Kg ha^-1 of H₂SO₄ in actual acid sulfate soils. The lowest amounts were observed in La Caimanera with 11.890 and 3.528 Kg ha^-1 H₂ SO₄. The results suggest that acidity generated from pyritic oxidation may cause significant impact on wetlands of the Sinú river valley

1. Andriesse, W. 1993. Acid sulphate soils: Diagnosing the illness. En: Dent D. y Mensvoort M. (Ed). Proceedings of The Symposium on Acid Sulphate Soils, Ho Chi Minh City, 53:11-30
2. Bennett, C.; White, I.; Keene, A.; Melville, M. y Reynolds, J. 2004. Super Soil. Australian New Zealand Soils Conference, University of Sydney, CDROM
3. Combatt, E. 2004. Efecto del encalamiento y el lavado sobre algunas propiedades químicas de un suelo sulfatado ácido magnésico del valle del rió Sinú. Tesis M. Sc., Universidad Nacional de Colombia, Palmira
4. Cook, F.; Dobos, S.; Carlin G. y Millar G. 2004. Oxidation rate of pyrite in acid sulfate soils: in situ measurements and modeling. Australian Journal of Soil Research 42(6):499-507
5. Demas, A.; Hall, A.; Fanning, B.; Rabenhorst, B. y Dzantor, B. 2004. Acid sulfate soils in dredged materials from tidal Pocomoke Sound in Somerset County, MD, USA. Australian Journal of Soil Research 42(6):537-545
6. DNRMI (Department of Natural Resources, Mines, Indoorroopilly). 2004. Acid Sulfate Soils Laboratory Methods Guidelines, Quesland, 132p.
7. Janssen, J. y Hendro, P. 1990. Acid sulphate soils; field characteristics and mapping. Papers Workshop on Acid Sulphate Soils in the Humid Tropics. International Institute for Land Reclamation and Improvement, p51- 61
8. Jianwu, W. y Shiming, L. 2002. Sulfur and its acidity in acid sulfate soil of Taishan coastal plain in southern China. Communications in Soil Science and Plant Analysis 33:(3-4):579-593
9. Konsten, C. y Brinkman, R. 1984. A field laboratory method to determine total potential and actual acidity in acid sulphate soils. Proceedings Symposium on Acid Sulphate Soils. Dakar, p106
10. Konsten, C; Brinkman, R. y Andriesse W. 1988. A field laboratory method to determine total potencial and actual acidity in acid sulphate soils. Proceedings Symposium on Acid Sulphate Soils. Dakar, p106-134
11. Lin, C. y Lin, C. 1996. Human influences on the development of acid sulphate soils in the pearl River (The Zhujiang) delta. Pedosphere 6(1):1-10
12. Macdonald, B; White, I.; Keene, A.; Melville.; M. y Reynolds, J. 2004. Acidity, metals and acid sulfate soils. 3rd Conference SuperSoil Australian - New Zealand Soils.
13. McElnea, A.; Ahern, C. y Menzies, N. 2002. The measurement of actual acidity in acid sulfate soils and the determination of sulfidic acidity in suspension after peroxide oxidation. Australian Journal of Soil Research 40:1133-1157
14. Rayment, G. 2002. Actual and potential pyritic acidity of new canelands. Communications in Soil Science and Plant Analysis 33(15-18):3033-3044
15. Villota, H. 1992. El sistema CIAF de clasificación fisiográfica del terreno. CIAF - IGAC, Bogotá, 13(1):55-70
16. Willett, I.; Melville, M. y White I. 1992. Acid drainwaters from potencial sulhate soils and their impact on estuarine ecosystems. Proceedings of Simposium on Acid Sulphate Soils, Ho Chi Minh City, 1:419-425