| 摘要: |
| 【目的】研究不同农田土壤对砷的吸附能力，以明确砷在土壤中的迁移转化及其有效性。【方法】 集全国18种典型农田土壤，分析其主要理化性质，采用吸附试验，测定不同土壤对外源砷（As(Ⅴ)）的吸附量及吸附率，并分析土壤吸附能力与土壤理化性质间的关系。【结果】不同农田土壤的理化性质存在明显差异。酸性土壤对外源砷的吸附能力大于碱性土壤，其中以赤红壤对外源砷的吸附能力最强，吸附量为1.64 mg/g，吸附率为6.83%，酸性土壤对外源砷的吸附量为0.19～1.64 mg/g，吸附率为0.64%～6.83%。碱性土壤中，以山东潮土对外源砷的吸附能力最强，吸附量为0.19 mg/g，吸附率达0.89%，山西褐土对外源砷吸附能力最差，吸附量仅为0.15 mg/g。土壤对外源砷吸附量与土壤黏粒和有机质含量呈正相关，与pH、阳离子交换量（CEC）、全磷、速效磷、CaCO3含量呈负相关。【结论】不同农田土壤对外源砷的吸附能力存在明显差异，其中pH对土壤吸附砷能力的影响最明显。 |
| 关键词: As(Ⅴ) 农田土壤 理化性质 吸附特征 |
| DOI： |
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| 基金项目:国家行业（农业）科技专项“主要农产品产地土壤重金属污染阈值研究与防控技术集成示范”（200903015） |
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| Differences in exogenous As(Ⅴ) adsorption and the relationship with soil physicochemical properties in major farmland types in China |
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ZHAO Xiao-yan,LÜ Jia-long,DAI Yun-chao,et al
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| Abstract: |
| 【Objective】This study aimed to research the arsenic (As) adsorption capacities of soils in different farmland types to understand the migration and transformation of As.【Method】Samples from 18 major agricultural soils were collected to analyze the physicochemical properties and determine the As(Ⅴ) adsorption capacities and adsorption rates using adsorption experiments.The relationship between As(Ⅴ) adsorption and soil physicochemical properties were analyzed as well.【Result】The physicochemical properties of different soil types were significantly different.Acidic soils had larger adsorption capacities than alkaline soils.Lateritic red soil had the largest As(Ⅴ) adsorption ability with the absorption capacity of 1.64 mg/g and the adsorption rate of 6.83%.Adsorption capacities and adsorption rates of other acidic soils were 0.19－1.64 mg/g and 0.64% to 6.83%,respectively.Shandong tide soil had the highest adsorption ability among alkaline soils with adsorption capacity of 0.19 mg/g and the adsorption rate of 0.89%.Cinnamon soil had the least adsorption ability with the adsorption capacity of 0.15 mg/g.The As(Ⅴ) adsorption abilities of soils were positively related to contents of clay and organic matter while negatively related to pH,CEC and contents of total phosphorus,available phosphorus,and CaCO3.【Conclusion】The As(Ⅴ) adsorption abilities of different soil types were significantly different.pH had the largest effects on As(Ⅴ) adsorption abilities. |
| Key words: As(Ⅴ) soil physicochemical properties adsorption |
