ABSTRACT

Application of biochar provide a novel approach against organic contaminated soil issues. The objective of this study was to evaluate the effect of biochars amendment on flumioxazin degradation using batch experiments. A simple and accurate pretreatment method coupled with liquid chromatography tandem with mass spectrometry was developed and successfully applied on the assessment trials of the effect of biochar amendment on the degradation of flumioxazin in soil. Three different types of biochar were characterized in terms of the degradation of flumioxazin in soil. The results demonstrated that flumioxazin degraded fast in four nonbiochar soil sample (half-lives of 11.1–20.8 days) but slower in biochar soils (half-lives of 15.4–30.7 days), and the effect varied with the nature of feedstock and pyrolysis temperature. Biochars prepared at 500°C (CB500 and RB500) could remove flumioxazin more effectively than the biochar prepared at 700°C (BB700). In addition, biochar content also affected the remediation. When the biochar content changed, the degradation rate of flumioxazin varied significantly. The degradation of flumioxazin was faster in soil samples with 0.5% cornstalk biochar than those in nonbiochar soil samples. As the biochar content increased, the degradation rate decreased because of the dominant adsorption efficiency. The results in this study support the environmental risk assessment of flumioxazin in soil and provide some guidance for biochar amendment in soil contaminated with flumioxazin.

摘要

生物炭的应用为解决有机污染土壤问题提供了一种新方法。本研究的目的是通过批量实验评估生物炭改良剂对氟米恶嗪降解的影响。建立了一种简单、准确的液相色谱-质谱联用预处理方法，并成功应用于生物炭改良剂对土壤中氟咪嗪降解效果的评价试验。三种不同类型的生物炭在土壤中对氟嘧菌胺的降解作用进行了表征。结果表明，氟噻嗪在四种非生物炭土壤样品中降解速度较快（半衰期为 11.1-20.8 天），而在生物炭土壤中降解速度较慢（半衰期为 15.4-30.7 天），且效果因原料性质和热解温度而异. 在 500°C 制备的生物炭（CB500 和 RB500）比在 700°C 制备的生物炭（BB700）可以更有效地去除氟米恶嗪。此外，生物炭含量也影响修复。当生物炭含量发生变化时，氟咪嗪的降解率变化​​显着。含0.5%玉米秸秆生物炭的土壤样品中氟噻嗪的降解速度快于不含生物炭的土壤样品。随着生物炭含量的增加，由于吸附效率占主导地位，降解速率降低。本研究结果支持氟嘧啶在土壤中的环境风险评估，为氟嘧啶污染土壤的生物炭改良提供一定的指导。当生物炭含量发生变化时，氟咪嗪的降解率变化​​显着。含0.5%玉米秸秆生物炭的土壤样品中氟噻嗪的降解速度快于不含生物炭的土壤样品。随着生物炭含量的增加，由于吸附效率占主导地位，降解速率降低。本研究结果支持氟嘧啶在土壤中的环境风险评估，为氟嘧啶污染土壤的生物炭改良提供一定的指导。当生物炭含量发生变化时，氟咪嗪的降解率变化​​显着。含0.5%玉米秸秆生物炭的土壤样品中氟噻嗪的降解速度快于不含生物炭的土壤样品。随着生物炭含量的增加，由于吸附效率占主导地位，降解速率降低。本研究结果支持氟霉嗪在土壤中的环境风险评估，为氟霉嗪污染土壤的生物炭改良提供一定的指导。