Enrichment of geogenic phosphorus in a coastal groundwater system: New insights from dissolved organic matter characterization

被引:7
|
作者
Liu, Zhaohui [1 ,2 ]
Du, Yao [1 ]
Deng, Yamin [1 ]
Huang, Yanwen [1 ]
Zhao, Xinwen [3 ]
Li, Qinghua [3 ]
机构
[1] China Univ Geosci, Sch Environm Studies, State Environm Protect Key Lab Source Apportionmen, Wuhan 430078, Peoples R China
[2] China Univ Geosci, Geol Survey Inst, Wuhan 430074, Peoples R China
[3] Wuhan Ctr China Geol Survey, Wuhan 430205, Peoples R China
关键词
Coast; Groundwater; Phosphorus; DOM; Pearl river delta; SOLID-PHASE EXTRACTION; PEARL RIVER DELTA; INORGANIC CARBON; AQUIFER SYSTEM; MARINE; WATER; FLUORESCENCE; NITROGEN; IODINE; CHINA;
D O I
10.1016/j.chemosphere.2023.138214
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
High concentrations of geogenic phosphorus (P) in coastal aquifer systems pose a serious and continuous threat to the health of marine ecosystems. A major source for geogenic P enrichment in aquifer systems is the mineralization of P-containing organic matter. However, the mechanisms that drive the enrichment remain unclear. Therefore, our study sought to characterize the occurrence, sources, and enrichment mechanisms of geogenic P in a coastal confined aquifer system of the Pearl River Delta, southern China. To achieve this, we conducted Fourier transform ion cyclotron resonance mass spectrometry (FT-ICR-MS) and fluorescence excitation-emission-matrix spectra (EEMs) as well as hydrochemistry and stable carbon isotope analyses. Our findings indicated that intense degradation of P-containing organic matter produced up to 8.07 mg/L of geogenic P in a reducing environment with abundant organic matter. The dissolved organic matter (DOM) of high-P groundwater (P > 1 mg/L) contained more humic-like fluorophores and exhibited higher humification. Groundwater with high P concentrations contained more aliphatic compounds and highly unsaturated-low O compounds, and the enrichment of P was mostly associated with CHOP compounds in the region of aliphatic compounds and CHON2P compounds in the region of highly unsaturated-low O compounds. Different types of dissolved organic phosphorus (DOP) can be mineralized into P, and even the mineralization of phosphonates takes precedence over the more unstable phosphate esters. P produced by the metabolism of different types of DOP was assimilated by marine microorganisms (e.g., heterotrophic bacteria and archaea), and the newly synthesized organic P compounds by chemosynthesis were subsequently released into the groundwater. Overtime, P continues to be enriched in the aquifer system. This study provides new insights into subsurface P cycling in coastal aquatic systems.
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页数:10
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