Hong Young-Kyu, Kim Jin-Wook, Lee Sang-Phil, Yang Jae-E, Kim Sung-Chul
Department of Bio-Environmental Chemistry, Chungnam National University, Daejeon 34134, Korea.
Department of Biological Environment, Kangwon National University, Chuncheon 24341, Korea.
Toxics. 2022 Feb 16;10(2):90. doi: 10.3390/toxics10020090.
Heavy metal pollution in soil can have detrimental effects on soil ecosystems and human health. In situ remediation techniques are widely used to reduce the bioavailable fractions of heavy metals in soil. The main objective of this study was to examine the reduction of the bioavailable fractions of As and Pb in paddy soil with artificial lightweight material (ALM) manufactured from recycled materials. A total of four treatments, including a control (no amendment), ALM10 (10% of ALM in soil), ALM10+L (10% ALM combined with 0.5% lime), and ALM10+FeO (10% ALM combined with 0.5% FeO), were applied to paddy fields, and rice ( L.) was cultivated after 32 weeks. The highest reduction efficiencies for the bioavailable fractions of As and Pb in soil were observed in the ALM10+FeO (52.8%) and ALM10+L treatments (65.7%), respectively. The uptake of As decreased by 52.1% when ALM10+FeO was applied to paddy soil, and that of Pb decreased by 79.7% when ALM10+L was applied. Correlation analysis between bioavailable heavy metals in soil and soil chemical properties showed that soil pH, electrical conductivity (EC), PO and soil organic matter (SOM) were the main factors controlling the mobility and bioavailability of As and Pb. Overall, the efficiencies of As and Pb reduction increased synergistically in both soil and plants when FeO and lime were combined with the ALM. In future studies, long-term monitoring is necessary to examine the longevity of soil amendments.
土壤中的重金属污染会对土壤生态系统和人类健康产生有害影响。原位修复技术被广泛用于降低土壤中重金属的生物可利用部分。本研究的主要目的是考察用回收材料制造的人工轻质材料（ALM）对稻田土壤中砷和铅生物可利用部分的降低作用。总共设置了四个处理，包括一个对照（不添加改良剂）、ALM10（土壤中添加10%的ALM）、ALM10+L（10%的ALM与0.5%的石灰混合）和ALM10+FeO（10%的ALM与0.5%的FeO混合），将其应用于稻田，32周后种植水稻（ ）。土壤中砷和铅生物可利用部分的最高降低效率分别在ALM10+FeO处理（52.8%）和ALM10+L处理（65.7%）中观察到。当在稻田土壤中施用ALM10+FeO时，砷的吸收量降低了52.1%，当施用ALM10+L时，铅的吸收量降低了79.7%。土壤中生物可利用重金属与土壤化学性质之间的相关性分析表明，土壤pH值、电导率（EC）、PO和土壤有机质（SOM）是控制砷和铅迁移性和生物有效性的主要因素。总体而言，当FeO和石灰与ALM结合时，土壤和植物中砷和铅的降低效率协同提高。在未来的研究中，有必要进行长期监测以考察土壤改良剂的长效性。
