Néhány nyugat-dunántúli talaj könnyen oldható nehézfémtartalmának hosszú idő alatti változása | Long-term changes in the soluble heavy metal content of some west Hungarian soils
2002
Szűcs, Mihály | Szűcs, Mihályné
Studies were made on the KCl-EDTA soluble heavy metal content of air-dry stored soil samples taken from farm fields in the Western part of Transdanubia and of samples taken from the same fields after an interval of 25–27 years. The exposition time included a long period when relatively high rates of mineral fertilizers were applied on farms. The investigation was carried out to study the long-term joint influence of processes of natural and human origin on the readily-soluble heavy metal content of the soils. The pH of the brown forest soils investigated decreased by a whole unit during the exposition time, whereas the organic matter content remained unchanged. The readily-soluble Cd and Cr contents of sandy soils significantly decreased during the 26–28 years of exposition. These changes were attributed to accelerated leaching due to the acidification of the environment. There were no significant changes in these two elements on soils with heavier texture. No change in the soluble heavy metal content of the soils due to contamination of traffic or fertilizer origin was observed. The soluble Co and Pb contents of the soils in the investigated region increased significantly. Some 70–80% of the increases could be attributed to the increase in the soluble Mn, Fe and Al contents of the soils as the result of acidity and redox processes. A leading role in this process was attributed to Mn. It can be concluded that the changes in the soluble heavy metal content of the soils in the investigated region were induced by natural processes and not by contamination.
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