College of Natural Resources and Environment, South China Agricultural University, Guangzhou, 510642, China.
Guangdong Provincial Key Laboratory of Agricultural & Rural Pollution Abatement and Environmental Safety, Guangzhou, 510000, China.
Environ Sci Pollut Res Int. 2023 Sep;30(41):94950-94959. doi: 10.1007/s11356-023-29124-1. Epub 2023 Aug 5.
Although organophosphate esters (OPEs) and nitrogen (N) are normally present in aquatic environments, the effects of the plant uptake, accumulation, and translocation of OPEs in different levels of N remain ambiguous. To better understand these processes, watermifoil (Myriophyllum aquaticum L.) as tested plant was chosen to investigate the effects of different N levels on the uptake and translocation of OPEs by plants in matched water-sediment-plant samples. After two months, we found the root-water concentration factors, root-sediment concentration factors, and translocation factors (TFs) were significantly changed with the levels of N (p < 0.05), implying that the presence of N could alter uptake, accumulation, and translocation of OPEs in M. aquaticum, particularly the process of root absorption. Low concentrations of N could remarkably promote the uptake of OPEs by M. aquaticum. However, when the concentrations of N in water were higher than 200 mg/L, the plants' growth and OPE accumulation by M. aquaticum were obviously inhibited with the elevated N contents. Moreover, the enrichment and environmental transport of OPEs in M. aquaticum seemed to be closely associated with physicochemical parameters; the octanol-water partition coefficient had significant relationships with measured organic carbon-normalized sediment-water partition coefficients and TFs in the present study. Additionally, the substituents and structures of OPEs could also affect the accumulation and translocation of OPEs in M. aquaticum, including the chlorination degree and alkyl chain length. This study could improve our understanding of uptake and translocation of OPEs in aquatic plants under different levels of N.
尽管有机磷酯 (OPEs) 和氮 (N) 通常存在于水生环境中，但植物对 OPEs 的吸收、积累和转运在不同 N 水平下的影响仍不清楚。为了更好地理解这些过程，选择水蕹菜 (Myriophyllum aquaticum L.) 作为受试植物，以研究不同 N 水平对植物在匹配的水-沉积物-植物样品中吸收和转运 OPEs 的影响。两个月后，我们发现根-水浓度因子、根-沉积物浓度因子和转运因子 (TFs) 随 N 水平显著变化 (p < 0.05)，这意味着 N 的存在会改变 OPEs 在水蕹菜中的吸收、积累和转运，特别是根吸收的过程。低浓度的 N 可以显著促进 OPEs 被水蕹菜吸收。然而，当水中 N 的浓度高于 200 mg/L 时，植物的生长和水蕹菜对 OPE 的积累明显受到抑制，而 N 含量增加。此外，OPEs 在水蕹菜中的富集和环境迁移似乎与理化参数密切相关；辛醇-水分配系数与本研究中测定的有机碳归一化沉积物-水分配系数和 TFs 具有显著关系。此外，OPEs 的取代基和结构也会影响 OPEs 在水蕹菜中的积累和转运，包括氯化程度和烷基链长度。本研究可以提高我们对不同 N 水平下水生植物中 OPEs 吸收和转运的理解。
