固化/稳定化修复后场地土壤中铬的环境行为与归趋

土壤重金属铬(Cr)污染形势严峻，对人群健康和生态环境构成了严重威胁。通过固化/稳定化技术降低土壤中金属的毒性或迁移性，是Cr污染场地常用的修复技术之一。由于Cr的环境行为变化多端、机制复杂，故导致固化/稳定化修复后场地存在Cr污染反弹的环境风险。综述了Cr在土壤中的氧化还原、吸附与解吸、沉淀与溶解，以及植物、微生物吸收与转化等多种环境行为；并梳理了已修复的Cr污染场地案例及场地长期跟踪监测数据，探讨了固化/稳定化修复后Cr的环境归趋及其影响因素，以期为修复后场地的风险管理提供参考。

Environmental behavior and fate of chromium in the soils of solidification/stabilization post-remediation sites

The chromium (Cr) contamination in soils has posed a serious threat to human health and ecological environment. As the most popular remedial technique addressing Cr contaminated sites, solidification/stabilization can effectively decrease the toxicity and mobility of Cr in soils. Due to the complex and diverse environmental behavior of Cr, however, there are risks of pollution recurrence in post-remediation sites. This review highlighted the environmental behavior of Cr, such as oxidation/reduction, adsorption/desorption, and dissolution/precipitation in soil, as well as the migration and transformation associated with plants and microorganisms. Long-term monitoring data of contaminated sites were also summarized. The environmental fate and key influential factors of Cr in post-remediation sites, where solidification/stabilization was employed, are discussed. This review will provide the critical information for the risk management of post-remediation sites.