Source identification of dissolved inorganic phosphorus in a typical P-contaminated river: New constraints from multiple isotopes (inorganic C, Sr, Ca)

IF 5.9 1区地球科学 Q1 ENGINEERING, CIVIL

Journal of Hydrology Pub Date : 2025-03-20 DOI:10.1016/j.jhydrol.2025.133138

Zhanyao Shi , Yao Du , Hongni Liu , Xianjun Xie

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Abstract

The sources of dissolved inorganic phosphorus (DIP) in rivers are complex and diverse due to the continuously changing environment, presenting a significant hurdle in precisely identifying the sources within river systems. This study jointly used multiple isotopes (inorganic C, Sr, Ca) for the first time to determine the sources and detailed transformation of DIP in a typical P-contaminated river in the central Yangtze. The results of this work showed that the aqueous chemistry of the river in the phosphorite area was mainly affected by the weathering of dolomite by carbonic acid and sulfuric acid, as well as the weathering of silicate minerals by sulfuric acid. Within the anthropogenic area, the river water chemistry was mainly shaped by the weathering of limestone and dolomite by carbonic acid, along with silicate minerals weathering induced by carbonic acid. The changes in ⁸⁷Sr/⁸⁶Sr indicated that the DIP content in river water mainly came from the weathering of phosphate-containing dolomite and the discharge of domestic sewage in the phosphorite area. More negative δ¹³C_DIC values were accompanied by higher concentrations of ions related to human activities and DIP, indicating that the DIP content in river water primarily originated from agricultural cultivation and domestic sewage discharge in the anthropogenic area. Additionally, the secondary mineral precipitation fractionated Ca isotopes in the phosphorite area, adsorbing DIP in the river, and resulting in reduced DIP concentrations. Moreover, the decrease in δ¹³C_DIC values was accompanied by an increase in HCO₃⁻ and DIP concentrations, indicating that the degradation of organic phosphorus within the river bodies in the anthropogenic area contributed to an increase in DIP concentration to a specific extent. This study’s findings offer a new methodology and perspective regarding the sources of DIP in river ecosystems.

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来源期刊

Journal of Hydrology 地学-地球科学综合

CiteScore

11.00

自引率

12.50%

发文量

1309

审稿时长

7.5 months

期刊介绍： The Journal of Hydrology publishes original research papers and comprehensive reviews in all the subfields of the hydrological sciences including water based management and policy issues that impact on economics and society. These comprise, but are not limited to the physical, chemical, biogeochemical, stochastic and systems aspects of surface and groundwater hydrology, hydrometeorology and hydrogeology. Relevant topics incorporating the insights and methodologies of disciplines such as climatology, water resource systems, hydraulics, agrohydrology, geomorphology, soil science, instrumentation and remote sensing, civil and environmental engineering are included. Social science perspectives on hydrological problems such as resource and ecological economics, environmental sociology, psychology and behavioural science, management and policy analysis are also invited. Multi-and interdisciplinary analyses of hydrological problems are within scope. The science published in the Journal of Hydrology is relevant to catchment scales rather than exclusively to a local scale or site.