Engineering Research Center of Clean and Low-carbon Technology for Intelligent Transportation, Ministry of Education, School of Environment, Beijing Jiaotong University, Beijing 100044, China.
Engineering Research Center of Clean and Low-carbon Technology for Intelligent Transportation, Ministry of Education, School of Environment, Beijing Jiaotong University, Beijing 100044, China.
Sci Total Environ. 2024 Nov 25;953:175947. doi: 10.1016/j.scitotenv.2024.175947. Epub 2024 Sep 10.
In the field of soil remediation, the importance of bioavailability of pollutants has not received adequate attention, leading to the excessive application of remediation measures. Therefore, to ensure the safe use of farmland soil, a scientific method is needed to assess labile contaminants and their translocation in plants. To evaluate soil remediation effect based on bioavailability, the concentrations of these heavy metals in soil were analyzed using by the method for total metal content, the Community Bureau of Reference (BCR) extraction, and the diffusive gradients in thin films (DGT) technique. The results reveal that the correlation coefficients between metal concentrations measured by DGT and those accumulated in rice grains are the highest (Cr-R = 0.8966, Pb-R = 0.9045). However, the capability of method for total metal content to evaluate the remediation effect of heavy metals is very limited. In contrast, although Cr and Pb measured by BCR show a high correlation with HMs in rice plants, the method still falls short in precisely assessing bioavailability. Significantly, DGT proves to be more effective, successfully distinguishing the remediation effects of different treatments. Generally, DGT offers a more accurate and simpler assessment method, underscoring its practical significance for monitoring soil remediation and environmental management.
在土壤修复领域，污染物的生物可利用性尚未得到足够重视，导致修复措施过度应用。因此，为了确保农田土壤的安全使用，需要采用科学的方法来评估活性污染物及其在植物中的迁移。为了基于生物有效性评估土壤修复效果，采用全金属含量法、欧洲共同体理事会（BCR）提取法和薄膜扩散梯度法（DGT）分析土壤中这些重金属的浓度。结果表明，DGT 测量的金属浓度与稻米中积累的金属浓度之间的相关系数最高（Cr-R=0.8966，Pb-R=0.9045）。然而，全金属含量法评估重金属修复效果的能力非常有限。相比之下，尽管 BCR 测量的 Cr 和 Pb 与稻米中的 HMs 高度相关，但该方法仍无法准确评估生物有效性。重要的是，DGT 被证明更有效，成功区分了不同处理的修复效果。总体而言，DGT 提供了一种更准确、更简单的评估方法，突出了其在土壤修复和环境管理监测方面的实际意义。
