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当前位置: 首页 > 文章 > 改良剂对Pb污染土壤中Pb形态及植物有效性的影响 农业环境科学学报 2008,27 (01) 170-173
Position: Home > Articles > The Effectiveness of Amendment on Pb Form and Bioavailability in Pb Contaminated Soil Journal of Agro-Environment Science 2008,27 (01) 170-173

改良剂对Pb污染土壤中Pb形态及植物有效性的影响

作  者：
陈恒宇;郑文;唐文浩
单  位：
华南热带农业大学环境与植物保护学院
关键词：
Pb污染;Pb形态;改良剂;土壤修复
摘  要：
通过盆栽试验和土壤连续浸提-原子吸收法探讨了过磷酸钙、石灰、硫化钠对Pb污染土壤中Pb存在的6种化学形态(水溶态、可交换态、碳酸盐结合态、铁锰氧化物结合态、有机物结合态和残渣态)及植物有效性的影响。结果表明,改良剂对水溶态Pb修复的效果:硫化钠>石灰>过磷酸钙;对交换态Pb的修复效果:石灰>过磷酸钙>硫化钠;对碳酸盐结合态Pb修复效果:石灰>硫化钠>过磷酸钙;对铁锰氧化态Pb的修复效果:过磷酸钙>硫化钠>石灰;对有机结合态与残渣态Pb的修复效果:硫化钠>石灰>过磷酸钙。改良剂的施加可使土壤Pb的有效态含量降低、活性下降,抑制了Pb在土壤-植物体系的迁移,从而有利于植物安全生产。
译  名：
The Effectiveness of Amendment on Pb Form and Bioavailability in Pb Contaminated Soil
作  者：
CHEN Heng-yu, ZHENG Wen, TANG Wen-hao (Environment and Botanical Protection College, South China University of Tropical Agriculture, Danzhou 571737, China)
关键词：
Pb contamination; Pb form; amendment; soil remediation
摘  要：
Pb could not be biodegraded in soil, and various forms of Pb proportion directly affect the migration, transformation of Pb in soil and toxicity to the plant. When the soil is polluted by Pb, the content of water-soluble Pb can also be correspondingly increased, and this part of Pb is very easily absorbed and accumulated by plant. The bioavailability and toxicity of Pb could be reduced through adding amendments into soil. Pot experiment and sequential extraction-atomic absorption procedure were used to research the effectiveness of calcium superphosphate, lime, sodium sulphide on plant availability and six chemical forms of Pb in contaminated soil, namely water-soluble, exchangeable, carbonates bound, Fe/Mn oxides bound, organic matter bound, residual. The results indicated that, Pb in soil gradually transformed from effective form to invalid form as time passing. The addition of amendment obviously deactivated the availability of Pb. The content of water-soluble Pb and exchangeable Pb in soil decreased, but the residual Pb elevated. The effect of amendment on remediation of water-soluble Pb followed the order: sodium sulphide>lime>calcium superphosphate, while for exchangeable Pb was lime>calcium superphosphate> sodium sulphide, for carbonates bound Pb was lime> sodium sulphide>calcium superphosphate, for Fe/Mn oxides bound Pb was calcium superphosphate>sodium sulphide> lime, and for organic matter bound Pb and residual Pb were the same, sodium sulphide>lime>calcium superphosphate. The application of amendments can reduce available contents and activity of Pb in soil, and inhibit Pb transformation in soil-plant system, thus greatly benefit the safe production of plant.

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