硫元素对土壤重金属有效性的影响

生物工程论文编号:SW018  论文字数:6361,页数:22

目  录
中文摘要 I
英文摘要 II
目录 III
1. 绪论 1
2. 实验部分 4
 2.1 材料和仪器 4
 2.2 实验方法 4
3. 结果与讨论 7
 3.1 硫代硫酸钠对重金属污染水稻根际土PH的影响 7
 3.2 硫代硫酸钠对重金属污染水稻根际土壤重金属有效态的影响 8
 3.3 硫代硫酸钠对水稻植株重金属累积的影响 10
4．总结与展望 17
致谢 18
参考文献 19

 摘 要：重金属的有效性及形态变化是一个物理、化学和微生物联合作用的过程。土壤中硫的形态转化可通过直接氧化和间接释放金属配位体的方式影响重金属的有效性和植物吸收累积量。深入了解土壤硫循环对重金属形态转化的影响，揭示不同形态硫化物、微生物和植物对重金属有效性和植物吸收累积的机理，对于重金属的修复研究具有重要意义。本论文主要介绍了硫元素对土壤重金属有效性的影响，并介绍了土壤重金属的提取方法和土壤重金属含量的测定。通过盆栽试验，研究了硫元素对土壤铜，锌，铅有效性的影响和水稻对他们的吸收。结果表明，在硫元素作用下土壤pH值下降，铜，锌的有效性显著增加，但对铅的有效性无显著影响。
关键词：硫元素；有效性；Cu；Zn；Pb；吸收；水稻

The effectiveness of heavy metals in soil with element sulfur

Abstract： The oxidation and reduction of heavy metals in soil involves both chemical and microbial process. Microbial oxidation and reduction of S, the necessary nutriment and considered as the minimum risk acidification, may influence changes in Cu and Zn solubility, toxicity and bioavailability, either through direct oxidation of metal sulfides or indirectly by the release of metal complexing agents into the soil solution. Knowledge of how heavy elements affected by sulfides and element sulfur, is an important factor in understanding their biogeochemical cycling in soil and high efficient combined bioremediation technology for soil metal pollution.This paper describes the effectiveness of heavy metals in soil with element sulfur, and introduced the extraction of heavy metals in soil and determination the content of heavy metals in soil. A pot experiment was conducted to study the influence of elemental sulphur on solubility of soil Cu, Zn and Pb and uptake by rice. The result showed that with S application soil pH decreased and the effectiveness of the Zn and Cd was significantly increased, but the effectiveness of Pb had no significant influence.
Keywords：Elemental sulphur; Effectiveness; Cu; Zn; Pb; Uptake; Rice