Shi Jiyan, Ye Jien, Fang Huaxiang, Zhang Shu, Xu Chen
Department of Environmental Engineering, College of Environmental and Resource Sciences, Zhejiang University, Hangzhou 310058, China.
MOE Key Laboratory of Environment Remediation and Ecological Health, College of Environmental & Resource Science, Zhejiang University, Hangzhou 310058, China.
Nanomaterials (Basel). 2018 Oct 16;8(10):839. doi: 10.3390/nano8100839.
The wide use of metal-based nanoparticles (MNPs) will inevitably lead to their release into soil, and consequently affect the quality and ecological functions of soil environments. In this study, two paddy soils with different properties were exposed to CuO NPs to evaluate the transformation of CuO NPs and their effects on soil properties and components. The results of single chemical extraction and X-ray absorption fine structure analysis showed that CuO NPs could release Cu ions once being applied into the flooding paddy soil and then progress toward the more stable forms (Cu₂S and Cu(OH)₂). CuO NPs could change the soil properties by increasing the pH and Eh of the lower organic matter-soil rather than those of the higher organic matter-soil. Furthermore, we found that the 1000 mg/kg CuO NPs could accelerate the degradation or mineralization of the organic matter, as well as the Fe reduction process, by increasing the Fe(II) content by 293% after flooding for 60 days in the lower organic matter soil. The microbial biomass in both soils was severely inhibited by CuO NPs and the organic matter could partly mitigate the negative effects of CuO NPs.
金属基纳米颗粒（MNPs）的广泛使用将不可避免地导致其释放到土壤中，进而影响土壤环境的质量和生态功能。在本研究中，将两种性质不同的水稻土暴露于氧化铜纳米颗粒（CuO NPs）中，以评估CuO NPs的转化及其对土壤性质和成分的影响。单一化学提取和X射线吸收精细结构分析结果表明，CuO NPs一旦施用于淹水水稻土中就会释放出铜离子，然后向更稳定的形态（Cu₂S和Cu(OH)₂）转变。CuO NPs可以通过提高低有机质土壤的pH值和氧化还原电位（Eh）来改变土壤性质，而对高有机质土壤则不然。此外，我们发现，在低有机质土壤中淹水60天后，1000 mg/kg的CuO NPs可使铁（II）含量增加293%，从而加速有机质的降解或矿化以及铁还原过程。两种土壤中的微生物生物量均受到CuO NPs的严重抑制，而有机质可部分减轻CuO NPs的负面影响。
