Gao Zhuo, Yi Shujun, Xue Mengzhu, Zhu Kecheng, Yang Rongyan, Wang Tiecheng, Sun Hongwen, Zhu Lingyan
College of Natural Resources and Environment, Northwest A&F University, Yangling, Shaanxi Province 712100, PR China; Key Laboratory of Plant Nutrition and The Agri-environment in Northwest China, Ministry of Agriculture, Yangling, Shaanxi 712100, PR China.
College of Environmental Science and Engineering, Nankai University, Tianjin 300071, PR China.
J Hazard Mater. 2023 Apr 15;448:130896. doi: 10.1016/j.jhazmat.2023.130896. Epub 2023 Jan 30.
As alternatives of long-chain PFASs (Poly- and perfluoroalkyl substances), perfluoroalkyl phosphinic acids (PFPiAs) are increasingly observed in the environment, but their environmental behaviors have not been well understood. Here, the microbial biotransformation of C6/C6 and C8/C8 PFPiA in two soils (Soil N and Y) was investigated. After 252 d and 330 d of incubation with PFPiAs in Soil N and Y respectively, the levels of PFPiAs decreased distinctly, accompanied by the increasing perfluorohexaphosphonic acid (PFHxPA) or perfluorooctanophosphonic acid (PFOPA) formation, magnifying PFPiAs were susceptible to C-P cleavage, which was also confirmed by the density functional theory calculations. The half-lives of the PFPiAs were longer than one year, while generally shorter in Soil N than in Soil Y and that of C6/C6 was shorter than C8/C8 PFPiA (392 d and 746 d in Soil N, and 603 and 1155 d in Soil Y, respectively). Metagenomic sequencing analysis revealed that Proteobacteria as the primary host of the potential functional genes related to CP bond cleavage might be the crucial phyla contributing to the biotransformation of PFPiAs. Meanwhile, the more intensive interactions between the microbes in Soil N consistently contribute to its greater capacity for transforming PFPiAs.
作为长链全氟烷基物质（PFASs，多氟和全氟烷基物质）的替代品，全氟烷基次膦酸（PFPiAs）在环境中越来越多地被检测到，但其环境行为尚未得到充分了解。在此，研究了两种土壤（土壤N和土壤Y）中C6/C6和C8/C8 PFPiA的微生物生物转化。分别在土壤N和土壤Y中与PFPiAs孵育252天和330天后，PFPiAs的含量明显下降，同时全氟己基次膦酸（PFHxPA）或全氟辛基次膦酸（PFOPA）的生成增加，表明PFPiAs易发生C-P键断裂，这也通过密度泛函理论计算得到证实。PFPiAs的半衰期超过一年，一般在土壤N中比在土壤Y中短，且C6/C6的半衰期比C8/C8 PFPiA短（在土壤N中分别为392天和746天，在土壤Y中分别为603天和1155天）。宏基因组测序分析表明，变形菌门作为与C-P键断裂相关潜在功能基因的主要宿主，可能是促成PFPiAs生物转化的关键门类。同时，土壤N中微生物之间更强烈的相互作用持续促成其对PFPiAs更强的转化能力。
