Effects of pH on vertical migration of cadmium in the sea land interaction zone
WANG Fang-ting1, CHEN Zhi-hua1, BAO Ke2, ZHAO Xin-wen3, HUANG Chang-sheng3
1. School of Environmental Studies, China University of Geosciences, Wuhan 430074, China; 2. Safety Center for River and Lake Protection, Construction and Operation, Changjiang Water Resources Commission of the Ministry of Water Resources, Wuhan 430015, China; 3. Wuhan Geological Survey Center, China Geological Survey, Wuhan 430205, China
Abstract：In order to investigate the vertical migration of cadmium (Cd) in the sea-land interaction soil under the influence of pH, a total of 18sets of deep soil profiles (each set sampled at 5different depths) were considered to determine the pH and the content of Cd in soil with different buried depths. Geological accumulation index and potential ecological risk index were used to evaluate the degree of Cd pollution. The Cd pollution degree was evaluated by the method of geological accumulation index and potential ecological risk index, and the correlation analysis was used to identify the influence of soil pH on Cd migration and transformation. The results showed that the soil in Nansha of Guangzhou is medium-high polluted with maximum ecological risk. In 0~20cm soil profile, 88.89% soil pH≤7.5and 88.89% soil Cd content≥0.3mg/kg. Furthermore, the pollution degree and the potential degree of risk of soil showed a negative correlation to the depth of soil. The correlation coefficient between pH value and water soluble Cd was -0.93 (P < 0.01), and that between pH value and weak acid extracted Cd was 0.92 (P < 0.01). Moreover, soil pH value and weak acid extracted Cd increased gradually while the soil water-soluble Cd decreased gradually with the increase of soil depth. Neutral and alkaline soils can inhibit the vertical migration of Cd, while weak acid and acid soils increase the vertical migration volume and migration depth of Cd due to the low adsorption. These results have important significance for the regional prevention and control of Cd pollution in farmland surrounding cities as well as for the treatment and remediation of polluted soil.
王芳婷, 陈植华, 包科, 赵信文, 黄长生. pH值对海陆交互相土壤镉纵向迁移转化的影响[J]. 中国环境科学, 2021, 41(1): 335-341.
WANG Fang-ting, CHEN Zhi-hua, BAO Ke, ZHAO Xin-wen, HUANG Chang-sheng. Effects of pH on vertical migration of cadmium in the sea land interaction zone. CHINA ENVIRONMENTAL SCIENCECE, 2021, 41(1): 335-341.
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