Organic matter increases jarosite dissolution in acid sulfate soils under inundation conditions
Chengxing Chu A , Chuxia Lin A B , Yonggui Wu A , Wenzhou Lu A and Jie Long AA College of Resources and Environment, South China Agricultural University, Guangzhou 510642, China.
B Corresponding author. Email: cxlin@scau.edu.cn
Australian Journal of Soil Research 44(1) 11-16 https://doi.org/10.1071/SR05096
Submitted: 12 July 2005 Accepted: 31 October 2005 Published: 10 February 2006
Abstract
A column experiment was conducted to examine the effects of added organic matter and thickness of surface water on the stability of jarosite in a coastal acid sulfate soil. The results show that dissolution of jarosite was negligible if no organic matter was added onto the soil. However, where organic matter was added onto the soils, the acidity and the concentrations of iron and sulfate in the leachate of the soil increased following water inundation, indicating the decomposition of jarosite in such conditions. Probably, the organic matter content of the soil was originally too low to enable the creation of reducing conditions that could sufficiently cause the breakdown of jarosite contained in the soil. Under the experimental conditions, the amount of added organic matter played a more important role than the thickness of the overlying water in the dissolution of jarosite.
Additional keywords: jarosite, acid sulfate soil, inundation, organic matter, acidity.
Acknowledgments
This work was financially supported by the Natural Science Foundation of China (Project No. 40471067). The authors would also like to thank Associate Professor Leigh Sullivan at the Southern Cross University and Associate Professor Zhang Jiaen at the South China Agricultural University for their assistances in the filed.
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