State Environmental Protection Key Laboratory of Synergetic Control and Joint Remediation for Soil & Water Pollution, Chengdu University of Technology, Chengdu 610059, Sichuan, PR China.
State Environmental Protection Key Laboratory of Synergetic Control and Joint Remediation for Soil & Water Pollution, Chengdu University of Technology, Chengdu 610059, Sichuan, PR China.
Sci Total Environ. 2022 Feb 1;806(Pt 2):150299. doi: 10.1016/j.scitotenv.2021.150299. Epub 2021 Sep 11.
In the present study, we investigated the responses of microbial respiration and community structure, enzyme activity and DTPA-extractable Pb within 60 days of incubation in soils treated with Pb and nano-ZnO. The results showed that when the concentration of nano-ZnO exceeded 10 mg/kg, the concentration of DTPA-extractable Pb significantly decreased by 10.6%-21.3% on the 60th day of the experiment. The addition of nano-ZnO decreased the Pb-contaminated soil pH from 6.18 to 6.08 at 7 days, which is part of the reason for the β-glucosidase activity change. Ten mg/kg nano-ZnO significantly reduced the qCO value, which represented the microbial energy demand for the conversion of carbon sources into biomass. Nano-ZnO improved the microbial diversity and richness of some metal-tolerant bacteria at 60 days. The findings provide deeper insight into the responses of soil microbes and Pb bioavailability in the presence of nano-ZnO particles.
在本研究中，我们研究了在 Pb 和纳米 ZnO 处理的土壤中培养 60 天内微生物呼吸和群落结构、酶活性和 DTPA 可提取 Pb 的响应。结果表明，当纳米 ZnO 浓度超过 10mg/kg 时，实验第 60 天时 DTPA 可提取 Pb 的浓度显著降低了 10.6%-21.3%。纳米 ZnO 的添加使 Pb 污染土壤的 pH 值从 6.18 降低到 6.08，这是 β-葡萄糖苷酶活性变化的部分原因。10mg/kg 的纳米 ZnO 显著降低了 qCO 值，这代表微生物将碳源转化为生物量的能量需求。纳米 ZnO 提高了一些耐金属细菌的微生物多样性和丰富度。这些发现为深入了解土壤微生物的响应以及纳米 ZnO 颗粒存在下 Pb 的生物利用度提供了更深入的认识。
