Chen Shi-Bao, Zhu Yong-Guan, Ma Yi-Bing, McKay G
Research Center for Eco-environmental Sciences, Chinese Academy of Sciences, 18 Shuangqing Road, Beijing 100085, PR China.
Environ Pollut. 2006 Feb;139(3):433-9. doi: 10.1016/j.envpol.2005.06.007. Epub 2005 Aug 10.
The effects of bone char (BC) application on the bioavailability of Pb in a polluted soil from Hunan Province, China were examined. The Pb-contaminated soil was treated with two types of bone char, one from the UK and the other from China. The bioavailability of Pb was determined in terms of the uptake by Chinese cabbage (Brassica chinensis L.), sequential extraction and X-ray diffraction analysis. The results indicate that the Pb concentrations in both shoots and roots decreased with increasing quantities of added bone char, and the application of BC from the UK at the rate of 1.6% (w:w) had the largest effect. Lead Pb concentrations in the shoots and roots decreased by 56.0% and 75.9%, respectively, whereas the application of BC from Zhejiang Province, China at the rate of 1.6% (w:w) reduced Pb concentrations in the shoots and roots to 2.04 mgkg(-1) and 8.42 mgkg(-1), respectively, only 45.8% and 30.2% compared to the control treatment. Sequential extraction results indicate that the addition of bone char, as a metal-immobilizing agent, substantially transforms soil Pb from non-residual fractions to the residual fraction. The transformation was further confirmed using X-ray diffraction studies.
研究了施用骨炭（BC）对中国湖南省污染土壤中铅生物有效性的影响。用两种骨炭处理受铅污染的土壤，一种来自英国，另一种来自中国。通过小白菜（Brassica chinensis L.）吸收、连续提取和X射线衍射分析来测定铅的生物有效性。结果表明，地上部和根部的铅浓度均随骨炭添加量的增加而降低，以1.6%（w:w）的比例施用英国骨炭的效果最大。地上部和根部的铅浓度分别降低了56.0%和75.9%，而以1.6%（w:w）的比例施用中国浙江省骨炭时，地上部和根部的铅浓度分别降至2.04 mgkg(-1)和8.42 mgkg(-1)，与对照处理相比仅分别降低了45.8%和30.2%。连续提取结果表明，作为金属固定剂添加骨炭可使土壤中的铅从非残留态大量转化为残留态。X射线衍射研究进一步证实了这种转化。
