摘要
通过室内培养试验,研究了纳米羟基磷灰石对土壤重金属的固定和修复,并通过毒性溶出试验TCLP(Toxicity Characteristic Leaching Procedure)对固定效果进行了评价。结果表明,纳米羟基磷灰石的施入显著降低了土壤中Cu和Zn的生物有效性,而且土壤中Cu和Zn有效态的含量与纳米羟基磷灰石的施用量呈显著负相关。其主要原因为纳米羟基磷灰石的水解释放大量OH-离子,导致土壤pH增加;此外纳米羟基磷灰石吸附固定重金属进而降低了土壤中重金属的有效性。包施不如同等材料用量混施的钝化效果好,且所用时间较长,但包施具有将所施材料和被吸附重金属移出土壤体系的优点。
Assessment of remediation of soil heavy metals with nano-particle hydroxyapatite was studied by Toxicity Characteristic Leaching Procedure by cultivation experiment. The results indicated that nano-particle hydroxyapatite significantly reduced the bioavailability of soil Cu and Zn, compared with the control. The more nano-particle hydroxyapatite added, the more the increasing equilibrium time, and the more the decreased bioavailability of soil Cu and Zn, since soil pH was significantly increased after the addition of nano-particle hydroxyapatite, and heavy metals could adsorb on nano-particle hydroxyapatite. The treatment of packet application was not better than mixed application and needed more time for equilibrium, but it could be fetched out from soil easily.
出处
《农业环境科学学报》
CAS
CSCD
北大核心
2009年第4期645-648,共4页
Journal of Agro-Environment Science
基金
国家重点基础研究发展规划项目(2007CB936604)
