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研究论文

邓文靖,周立祥,占新华.植物多酚物质原位钝化污染土壤重金属的研究Ⅱ.对土壤Cu环境行为和生物活性的影响动态[J].环境科学学报,2003,23(5):608-613

In situ immobilization of heavy metals by plant polyphenols in heavy metal-contaminated soils:Ⅱ.Effects on copper chemical and biological availability

摘要：通过室内好气培养和生物盆栽试验研究了缩合类植物多酚L和Y以及8羟基喹啉在污染红壤和潮土中的降解动态及其对土壤Cu环境行为的影响.结果表明植物多酚在两周内降解相对较快,而8羟基喹啉则难以降解.与空白相比,Cu污染土壤中施用植物多酚后土壤水溶性Cu显著下降,钝化Cu的效果次序为:8羟基喹啉>多酚Y>多酚L.随着植物多酚的降解,土壤Cu被释出,其水溶性Cu浓度与残留在土壤中多酚浓度(以DOC浓度表示)呈负相关关系,尤其在潮土上更为明显,而pH与水溶性Cu没有相关性.试验还发现,钝化剂施用后,小麦体内的Cu含量降低,因此,植物多酚是钝化重金属污染土壤的良好选择.

Abstract：The decomposing dynamics of condensed plant polyphenol L、Y and 8-hydroxyquinoline and copper environmental behavior in acidic and calcareous soils were studied by aerobic incubation and pot experiment. The results showed that plant polyphenols decomposed more quickly in two weeks after applied than 8-hydroxyquinoline. The decomposition rate of polyphenol L、Y and 8-hydroxyquinoline was 65.3%、37.8% and 27.0%, respectively. In comparison with the control, concentration of water-soluble copper was decreased significantly ,which concentration was 0.248-0.316 times in acidic soil and 0.063-0.276 times in calcareous soil as that of control. So the stability of different treatments were as follows: 8-hydroxyquinoline>polyphenol Y>polyphenol L. Cu was released with the decomposition of plant polyphenol. It was found that copper content had a negative correlation with that of plant polyphenol, especially in calcareous soil. However, it was found that there was no linear correlation between the concentration of soluble copper and pH. It can also be obtained that copper contents in wheat were dropped by 1.01%-58.5% in acidic soil and by 13.8%-33.6% in calcareous soil with plant polyphenols added. Therefore, plant polyphenols are good selection for stabilizing heavy-metal contaminated soils.