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| 苏州市南郊农田土壤和蔬菜中砷、铬、铅、镉的分布特征研究 |
| Research on the Distribution Characteristics of As,Cr,Pb,Cd in Farmland Soils and Vegetables in South Suburb of Suzhou |
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| DOI： |
| 中文关键词: 砷 铬 铅 镉 形态分布 农田土壤 蔬菜 苏州南郊 |
| 英文关键词: As Cr Pb Cd Fraction distribution Farmland soils Vegetables South suburb of Suzhou |
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| 中文摘要: |
| 通过对苏州市南郊农田土壤和蔬菜中砷（As）、铬（Cr）、铅（Pb）、镉（Cd）含量的监测分析，结果表明：土壤样品中，除As的总质量比平均值低于江苏省土壤背景值外，其余均高于背景值；而蔬菜样品中4种元素的总质量比平均值均低于《食品安全国家标准〓食品中污染物限量》（GB 2762—2012）中的限量值。聚类分析表明，土壤中Cd、Pb累积较多，Cr次之。同时，BCR连续提取法和相关性分析表明：土壤中As和Cr主要以残渣态为主；Pb以可还原态为主，弱酸提取态次之；Cd以弱酸提取态为主，可还原态次之。可见，土壤中Cd相对于其他3种元素具有较高的生物有效性和潜在危害性。 |
| 英文摘要: |
| The monitoring analysis of the contents of As,Cr,Pb and Cd in soil and vegetable samples taken from south suburb of Suzhou showed that the average amount of As was below the soil background value of Jiangsu province and average amounts of the rest three elements were higher than background values.The total amounts of all the four elements in vegetable samples were lower than the limited values of National Food Safety Standard Limited Values of Food Contaminants（GB 2762—2012）.The cluster analysis showed that the total amount of Cd and Pb was more than that of Cr.Simultaneously,the BCR continuous extraction method and the correlation analysis showed that the residual fraction was the main contribution for As and Cr,Pb was found mainly in the reducible fraction,soluble fraction come second,while Cd was mainly composed of soluble fraction and reducible fraction.Obviously,higher biological effectiveness was found for Cd than the other three elements indicating potential hazard to organisms. |
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