| 浅谈土壤铅污染及其生物有效性评价研究进展 |
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【论文摘要】从金属铅的性质出发,综述了土壤中铅的分布、土壤铅污染的来源,重点阐述了土壤中铅植物有效性评价方法及影响土壤铅植物有效性的因素,指出用土壤铅全量作为土壤铅环境质量评价标准存在的不足,而开展土壤铅植物有效性的评价研究将为铅土壤环境质量标准的完善提供更为切实的依据。
【论文关键词】铅;土壤污染;生物有效性;评价
AbstractStarting from the character of metallic lead,the distribution of lead in soil,the sources of soil lead pollution were reviewed. The evaluation of lead bioavailability and its impact factors were introduced.It also indicated that the use of soil total amount of lead as a soil environmental quality evaluation criteria was in deficiencies,and it would provide a more effective basis for improving soil environmental quality standards to carry out the study on evaluation of soil lead bioavailability.
Key wordslead;soil pollution;bioavailability;evaluation
1金属铅的性质
铅是元素周期表IVA族中的一个污染元素,原子量为207.2,核电荷和电子数为82,电子层结构为[Xe]4f145d106s26p2,电负性为1.55,离子半径为1.21?魡(Pb2+)和0.84?魡(Pb4+)。可见,铅作为离子可以+2价和+4价存在。其+2价氧化态稳定,+4价氧化态不稳定。+4价氧化态的铅有强的氧化性,在土壤环境中不能稳定存在。故土壤中铅的化学性质涉及+2价铅及其化合物。铅是强度不[1] [2] [3] [4] [5] [6] [7] [8] [9] [10] ... 下一页 >> |
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