Ding Ling, Li Jianbing, Liu Wei, Zuo Qingqing, Liang Shu-Xuan
College of Chemistry and Environmental Science, Hebei University, Key Laboratory of Analytical Science and Technology of Hebei Province, Baoding 071002, China.
Environmental Engineering Program, University of Northern British Columbia, Prince George, BC V2N4Z9, Canada.
Int J Environ Res Public Health. 2017 May 16;14(5):532. doi: 10.3390/ijerph14050532.
Lead is recognized as one of the most widespread toxic metal contaminants and pervasive environmental health concerns in the environment. In this paper, the effects of nano-hydroxyapatite (NHAP) on remediation in artificially Pb-contaminated soils and ryegrass were studied in a pot experiment. The addition of NHAP decreased the water- and acid-soluble, exchangeable, and reducible fractions of Pb, extracted using the Community Bureau of Reference (BCR) method, whilst greatly increasing the residual fraction of Pb. Oxidizable Pb was increased slightly. No significant increase in soil pH was caused by the application of NHAP. Compared to conditions without NHAP, the addition of NHAP decreased the Pb content in ryegrass shoots and roots by 13.19-20.3% and 2.86-21.1%, respectively. Therefore, the application of NHAP reduced the mobility and bioavailability of Pb in the soil. In addition, the application of NHAP improved the fresh weight of shoots and roots, and promoted the growth of ryegrass. NHAP played a positive role in stimulating ryegrass to secrete tartaric acid.
铅被认为是环境中分布最广的有毒金属污染物之一，也是普遍存在的环境健康问题。本文通过盆栽试验研究了纳米羟基磷灰石（NHAP）对人工铅污染土壤和黑麦草修复的影响。添加NHAP降低了采用欧洲共同体标准局（BCR）方法提取的铅的水溶态、酸溶态、可交换态和可还原态含量，同时大幅提高了铅的残渣态含量。可氧化态铅略有增加。施用NHAP未导致土壤pH值显著升高。与不添加NHAP的情况相比，添加NHAP使黑麦草地上部和根部的铅含量分别降低了13.19% - 20.3%和2.86% - 21.1%。因此，施用NHAP降低了土壤中铅的迁移性和生物有效性。此外，施用NHAP提高了地上部和根部的鲜重，促进了黑麦草的生长。NHAP在刺激黑麦草分泌酒石酸方面发挥了积极作用。
