Abstract:

In order to investigate the correlations of heavy metal with pH value in soils, the pH value, organic matter contents and heavy metal concentration of 60 soil samples collected from Changsha-Zhuzhou-Xiangtan urban agglomeration were analyzed. The results showed that the pH of 13.3% samples were lower than 5.0, 35% of samples were 5.0-6.5, 41.7% of samples were 6.5-7.5 and 10% of samples were 7.5-8.5. In conclusion, different mean heavy metal concentrations in soil samples were achieved during various pH ranges. The heavy metals contents increased significantly with the pH of soils increased from strong acidic, acidic soils to neutral soils. However, the heavy metal contents decreased in alkaline soil samples when the pH value over 7.5.