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研究论文

In situ immobilization of heavy metals by plant polyphenol in metal-contaminated soils:I. Effect on sorption and dissolution of copper

摘要：研究了两种缩合类植物多酚L和Y对土壤中污染元素Cu的吸持解吸的影响.结果表明植物多酚具有明显促进土壤吸持Cu,抑制土壤Cu的溶出作用,而且在潮土上效果更大.在所研究的Cu和多酚浓度范围内,多酚Y都比多酚L作用显著.Cu的吸持等温线可用Freundlich方程定量描述.有多酚存在的条件下土壤对Cu的吸持量比对照处理(不加多酚)高3-6倍.两种土壤对Cu吸持率随着多酚溶液浓度增加也随之增加,特别是在0-400mg(C)L的多酚溶液浓度范围内,多酚Y和多酚L的浓度每提高100mg(C)L,可分别使红壤对Cu的吸持率提高33.3%和56.6%,而使潮土提高14.1%和21.4%.在土壤对Cu的吸附率相对比较低时(如pH2-5),添加植物多酚显著增加土壤对Cu吸附.随着多酚溶液浓度的提高,两种土壤中Cu的溶出率都随之降低.

Abstract：The sorption and dissolution of copper in acidic and calcareous soils by two condensed plant polyphenols L and Y were studied. The results showed that plant polyphenols L and Y could increase markedly the sorption and decrease the dissolution of copper for both soils and the effect was more pronounced for calcareous soil than acidic soil. Within the Cu and polyphenol solution concentration ranges studied ,the increase in Cu sorption caused by Y was consistently greater than that by L. The Cu sorption isotherms could be well described by the Freundlich equation. With the presence of plant polyphenols Cu sorption capacity of both soils was 3-6 times higher than that of control. Increasing the polyphenols solution concentration caused a significant enhancement on the sorption of Cu by both soils, especiaug at the range of 0 00mg(C)/L of polyphenol solution, sorption of Cu was increased by 33 3% and 56 6% with a polyphenol solution increment of 100mg(C)/L for L and Y, respectively,in acidic sandy soil, and 14 1% and 21 4% in calcareous soil. An increase in polyphenol concentration significantly increased the sorption of Cu by both soils. Moreover, the increase of Cu sorption caused by plant polyphenols was more obvious in acidic soil with lower pH (pH2-5). In addition, the dissolution of Cu decreased with an increase of the concentration of plant polyphenols for both soils.