Institute of Organic Contaminant Control and Soil Remediation, College of Resources and Environmental Sciences, Nanjing Agricultural University, Nanjing, 210095, China.
Department of Civil and Environmental Engineering, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong, China.
Chemosphere. 2020 Dec;260:127603. doi: 10.1016/j.chemosphere.2020.127603. Epub 2020 Jul 11.
Large amounts of glomalin-related soil protein (GRSP) are present in the soil; however, the impacts of GRSP on the chemical process of soil polycyclic aromatic hydrocarbons (PAHs) are far under investigation. This research sought to elucidate the sorption of phenanthrene as a representative PAH by soils, including Kandiudult, TypicPaleudalf, and Mollisols with co-existing GRSP (0-50 mg/L). The results indicated that soil sorption capacities for phenanthrene reduced significantly. Notably, GRSP changed the sorption process of phenanthrene by Kandiudult, well described as the Freundlich model. In contrast, the phenanthrene sorption isotherms were well described with the Linear model for TypicPaleudalf and Mollisols. The reduced percentage of phenanthrene sorption due to GRSP addition was 7.01%-49.21%, 23.92%-68.71%, and17.26%-66.80% for Kandiudult, TypicPaleudalf and Mollisols, respectively. It was noted that GRSP has a strong capacity for phenanthrene sorption in aqueous solutions and elevates the availability of phenanthrene for microorganisms or plants. During the sorption process, the introduction of GRSP resulted in the reduction of organic matter in soils and elevated the concentrations of dissolved organic matter in solutions, which was the primary mechanism of GRSP-reduced phenanthrene sorption by soils. The findings revealed that GRSP enrichment can increase the mobility of PAHs in contaminated soils.
土壤中存在大量的与球囊霉素相关的土壤蛋白（GRSP）；然而，GRSP 对土壤多环芳烃（PAHs）化学过程的影响仍在深入研究中。本研究旨在阐明包括 Kandiudult、TypicPaleudalf 和 Mollisols 在内的土壤对作为代表性 PAH 的菲的吸附作用，这些土壤中同时存在着共存的 GRSP（0-50mg/L）。结果表明，土壤对菲的吸附能力显著降低。值得注意的是，GRSP 改变了 Kandiudult 对菲的吸附过程，可用 Freundlich 模型很好地描述。相比之下，菲在 TypicPaleudalf 和 Mollisols 上的吸附等温线可以用线性模型很好地描述。由于添加 GRSP，Kandiudult、TypicPaleudalf 和 Mollisols 中菲的吸附减少了 7.01%-49.21%、23.92%-68.71%和 17.26%-66.80%。需要注意的是，GRSP 对水溶液中的菲具有很强的吸附能力，提高了菲对微生物或植物的可用性。在吸附过程中，GRSP 的引入导致土壤中有机质减少，溶液中溶解有机质浓度升高，这是 GRSP 降低土壤菲吸附的主要机制。研究结果表明，GRSP 的富集可以增加污染土壤中 PAHs 的迁移性。
