| 冲积和湖积成因土壤Cd的吸附特征:以安徽省当涂县为例 |
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| 引用本文： | 段燕,汪丙国,王慧敏,焦团理,秦一雄,次仁卓玛.冲积和湖积成因土壤Cd的吸附特征:以安徽省当涂县为例[J].地球科学,2021,46(4):1490-1504. |
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| 作者姓名： | 段燕 汪丙国 王慧敏 焦团理 秦一雄 次仁卓玛 |
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| 作者单位： | 中国地质大学环境学院,湖北武汉430078;安徽省地质调查院,安徽合肥 230001 |
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| 摘 要： | 为揭示冲积与湖积成因土壤镉的吸附特征，以安徽省当涂县冲积成因的江心洲和冲积、湖积成因的大陇乡根际土壤为研究对象，开展土壤镉的等温吸附实验和吸附动力学实验.等温吸附实验结果表明，冲积土壤镉的吸附量（S）、等温吸附常数（K）和固液分配系数（Kd）均较湖积土壤明显偏大，显示冲积土壤对镉的吸附能力较湖积土壤强；吸附动力学实验表明，冲积土壤的最大吸附量、平衡吸附量均较湖积土壤大，吸附速率也明显偏大，尤其在吸附实验早期更为显著；等温吸附常数K和平衡吸附速率Vb与土壤理化性质的分析表明，土壤pH是造成研究区土壤镉吸附能力差异的主要原因，其次为物理性粘粒含量；土壤pH是影响研究区冲积土壤镉吸附能力的主要因素；湖积土壤镉的吸附能力受土壤pH、有机质含量、Cd含量、物理性粘粒含量等因素的综合影响.研究对于揭示Cd在水土系统的迁移转化规律以及土壤Cd的污染防治具有重要的指导意义.
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| 关 键 词： | 冲积土壤 湖积土壤 Cd 吸附特征 地球化学 |
| 收稿时间： | 2020-01-20 |
Adsorption Characteristics of Cd in Alluvial and Lacustrine Soils:A Case Study in Dangtu County,Anhui Province |
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| Duan Yan,Wang Bingguo,Wang Huimin,Jiao Tuanli,Qin Yixiong,Ciren Zhuoma.Adsorption Characteristics of Cd in Alluvial and Lacustrine Soils:A Case Study in Dangtu County,Anhui Province[J].Earth Science-Journal of China University of Geosciences,2021,46(4):1490-1504. |
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| Authors: | Duan Yan Wang Bingguo Wang Huimin Jiao Tuanli Qin Yixiong Ciren Zhuoma |
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| Abstract: | In order to reveal the adsorption characteristics of alluvial and lacustrine soil cadmium,in this paper it takes alluvial soils of Jiangxin Town and alluvial,lacustrine soils of Dalong Town as the research object in Dangtu County,Anhui Province. The isothermal adsorption experiment and adsorption kinetics experiment of soil cadmium were carried out. The results of isothermal adsorption experiments show that the soil cadmium adsorbance (S),the isothermal adsorption constant (K) and solid-liquid partition coefficient (Kd) of alluvial soils are significantly greater than those of the lacustrine soils,which indicates that the cadmium adsorption capacity of alluvial soils is stronger than that of lacustrine soils. The adsorption kinetics experiment shows that the largest adsorbance,balance adsorbance of soil cadmium in alluvial soils are bigger than those of the lacustrine soils,and the adsorption rate of alluvial soils is also higher than that of lacustrine soils,especially in the early stage of adsorption experiments. The correlation analysis between isothermal adsorption constant K,balance adsorption rate Vb and soil physical and chemical properties shows that soil pH is the main factor for the adsorption capacity of soil cadmium in the study area,which is followed by the physical clay content. Soil pH is the main factor of cadmium adsorption capacity for alluvial soils in the study area. The cadmium adsorption capacity for lacustrine soils is affected by pH,organic matter content,Cd content and the physical clay content synthetically in the study area. It has great significance to reveal the law of Cd migration and transformation in soil and water system and the prevention and control of Cd pollution in soil. |
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