探究生物炭对土壤 C 和 Si 溶解的老化效应及对铜固定的交互影响。
Investigating the Aging Effects of Biochar on Soil C and Si Dissolution and the Interactive Impact on Copper Immobilization.
机构信息
School of the Environment, South China Normal University, Guangzhou 510006, China.
Guangdong Provincial Key Laboratory of Chemical Pollution and Environmental Safety & MOE Key Laboratory of Theoretical Chemistry of Environment, South China Normal University, Guangzhou 510006, China.
出版信息
Molecules. 2020 Sep 21;25(18):4319. doi: 10.3390/molecules25184319.
Aging tests were used to investigate the long-term effects of BC on the immobilization of Cu, and the soil silicon dissolution of three types soils (black soil, (BS), vegetable garden soil (VS) and red soil (RS)). Litchi branch biochars (BC) at 10% (/) were incubated with three Cu (400 mg/kg) contaminated soils. The effect on soil properties of pH, soil organic carbon (SOC), dissolved organic carbon (DOC) and available silicon content were investigated, along with the speciation distribution of Cu. The results indicated that SOC, DOC, and available silicon content (except, BC300) increased with the application of BCs. On the other hand, the DTPA (diethylenetriaminepentaacetic acid) extractable Cu content in BS, VS and RS soils were reduced by 4-12%, 18-25%, and 12-19%, respectively. The Cu availability in all soils first increased, and then decreased during the aging process. The sum of the other four fractions, including the carbonate fraction and the inert component increased by 4-4.5% (BS), 1.4-2.1% (VS), and 0.5-1% (RS) respectively, over the long-term process. Moreover, during the whole aging process, the soil properties (such as pH, SOC, DOC and available silicon content) were almost stable. This study demonstrates that BCs, especially those produced at a higher temperature, are superior to those been produced at 300 °C in immobilizing Cu and releasing available silicon in soils. However, the remediation efficiencies were restricted by the soil type contamination status and remediation time.
老化试验用于研究 BC 对 Cu 固定和三种土壤（黑土、菜园土和红壤）硅溶出的长期影响。将荔枝枝生物炭（BC）以 10%（/）添加到三种 Cu（400mg/kg）污染土壤中。考察了土壤性质（pH、土壤有机碳（SOC）、溶解性有机碳（DOC）和有效硅含量）以及 Cu 的形态分布的变化。结果表明，随着 BC 的应用，SOC、DOC 和有效硅含量（除 BC300 外）增加。另一方面，BS、VS 和 RS 土壤中 DTPA（二乙三胺五乙酸）可提取 Cu 含量分别降低了 4-12%、18-25%和 12-19%。所有土壤中 Cu 的有效性先增加后减少。在整个老化过程中，其他四个部分的总和（包括碳酸盐部分和惰性成分）分别增加了 4-4.5%（BS）、1.4-2.1%（VS）和 0.5-1%（RS）。此外，在整个老化过程中，土壤性质（如 pH、SOC、DOC 和有效硅含量）几乎保持稳定。本研究表明，BC，尤其是在较高温度下制备的 BC，在固定 Cu 和释放土壤中有效硅方面优于在 300°C 下制备的 BC。然而，修复效率受到土壤类型污染状况和修复时间的限制。
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