【作者】 侯明；

【Author】 Hou Ming ( Department of Material and Chemical Engineering, Guilin University of Technology, Guilin 541004)

【机构】 桂林工学院材料与化学工程系；

【摘要】 <正>随着对土壤重金属污染研究的深入,人们已认识到用土壤重金属总量指标难以评价土壤污染状况,也难以表征其生物可利用性。因此一些学者提出了用重金属形态来评价土壤的污染程度和生物有效性。重金属的生物有效性是指能被重金属污染的土地上生存的生物(通常指植物)所吸收的重金属的数量;而重金属有效态一般指能被植物实际吸收的重金属的形态或能对生物的活性产生影响更多还原

【Abstract】 This paper study mainly the extraction and bioavailability of Hg. We extracted Available Hg in single extraction by four extractants, or HCl, MgCl2, NH4Ac and CyDTA. From the quantities of Hg extracted, the best extractant was determined. It was found that the extraction results of HCl were much better than other extractants. It is suitable to extract the bio-effec-tive parts of Hg in soils with the experimental condition, 1 mol/L HCl, soil: solution 1 : 5, equilibration time 60 min. Meanwhile, the content of Hg in soil and that in vegetable have obvious correlation. There are different quantities of Hg in different vegetables. The Hg content of different parts in the same vegetable is Qin cai > Lao cai > Gou ji > Wo sun. The content of different parts in the same vegetable is in this order: leafage > radical > stem. The accuracy and precision are good to trace analysis.更多还原