Key Laboratory of Soil Environment and Pollution Remediation, Institute of Soil Science, Chinese Academy of Sciences, Nanjing, 210008, China.
Environ Sci Pollut Res Int. 2018 Jan;25(1):73-80. doi: 10.1007/s11356-016-8063-5. Epub 2016 Nov 14.
Phosphate compounds and related materials are effective amendments for immobilization of heavy metals in contaminated soils. A greenhouse pot experiment with ryegrass (Lolium perenne) as the test plant was conducted to explore the impact of nanoparticle hydroxyapatite (HAP) on the immobilization and bioavailability of Cu and Zn in a heavy metal-polluted soil. The addition of nanoparticle HAP significantly decreased the uptake of Cu and Zn by ryegrass. As a result, the biomass of ryegrass increased as the rate of nanoparticle HAP increased. The toxicity characteristic leaching procedure (TCLP) and physiologically based extraction test (PBET) results of the treatments showed that the leachable and bioaccessible concentrations of Cu and Zn were significantly reduced after the soil stabilized with nanoparticle HAP. The XRD pattern of nanoparticle HAP was not changed by the presence of Cu and Zn, which suggests that Cu and Zn were immobilized by the formation of solid amorphous phosphate. Nanoparticle HAP was an effective material to immobilize heavy metals in contaminated soils.
磷酸盐化合物及相关材料是用于固定污染土壤中重金属的有效改良剂。采用温室盆栽试验，以黑麦草（Lolium perenne）为供试植物，研究纳米羟基磷灰石（HAP）对重金属污染土壤中 Cu 和 Zn 固定和生物有效性的影响。添加纳米 HAP 可显著降低黑麦草对 Cu 和 Zn 的吸收。因此，随着纳米 HAP 添加率的增加，黑麦草的生物量增加。毒性特征浸出程序（TCLP）和基于生理的提取试验（PBET）的结果表明，用纳米 HAP 稳定后的土壤中 Cu 和 Zn 的可浸出和生物可利用浓度显著降低。XRD 图谱表明，Cu 和 Zn 的存在并没有改变纳米 HAP 的结构，这表明 Cu 和 Zn 是通过形成无定形固相磷酸盐而被固定的。纳米 HAP 是一种有效固定污染土壤中重金属的材料。
