The effectiveness and characteristic of hydroxylapatite and compost amendment to Pb contaminated soils
This research was based upon experiments employing chemical stabilization technique by using hydroxylapatite and organic compost. Three representative agricultural soil samples were chosen. Different amounts of hydroxylapatite and organic composts were reacted with artificially Pb- contaminated soils. The Tessier and BCR (The European Community Bureau of Reference) method of sequential extraction was employed to determine the degree of contamination and to ascertain the mobility and bioavailability of Pb in the soil. An SEM was used to assess accumulations of main materials. The above methods evaluated the effectiveness and practicality of using hydroxylapatite on lead contaminated soils. The results indicate that after treatment with hydroxylapatite the chemical forms of Pb in the soil could be transformed from soluble, exchangeable and organic forms into unavailable and nonphytoavailable forms, which could not be dissolved by acids (aqua regia). Applying organic compost made a small amount of exchangeable form transformed into Fe-Mn oxides bound and residual form. This demonstrates that by applying hydroxylapatite and organic compost to lead contaminated soil, high mobility forms can be transformed into relatively stable forms, reducing their availability. Therefore, this method can be recommended for the reclamation of lead contaminated soils.
Pb hydroxylapatite sequential extraction procedure soil pollution
C. J. Liao T. L. Chung Y. C. Lee
Department of Environmental Science and Engineering, National Pingtung University of Science and Technology, Pingtung, 91201, Taiwan, China
国际会议
第九届痕量元素生物地球化学国际会议(9th International Conference on the Biogeochemistry of Trace Elements)
北京
英文
198-199
2007-07-15（万方平台首次上网日期，不代表论文的发表时间）