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- W4321369976 abstract "Abstract Nitrogen (N) has received attention as an indicator of water quality and pollution. However, the N content of rivers, lakes, and reservoirs varies significantly by season, and environmental factors such as temperature affect it. An experiment was conducted with a series of tanks containing sediments from the Pearl River Delta region of China and distilled water to assess the release of N from sediments under controlled conditions; temperatures from 10 to 30℃ were assessed. Results show that the effect of temperature on N in the water column and sediment is nonlinear. Only temperatures ranging from 20 ~ 25℃ affected NO 3 -N in shallow sediments. Temperatures lower than 20℃ had more effect on NH 4 -N concentration in the water column, while NO 3 -N concentration was affected heavily at higher temperatures. NH 4 -N typically is stable at a relatively high concentration in the water column at 20℃. While NO 2 -N is stable in the water column at higher temperatures, NO 3 -N is the dominant form of N in water bodies at temperatures from 25℃ to 30℃. At 20℃, dissolved inorganic nitrogen was released from the sediment to the water column, gradually reaching equilibrium. Temperature could affect the internal release of NH 4 -N; this process gradually accelerated as the temperature rose. However, the presence of NH 4 -N in a water body can inhibit its release, thus the relationship between the diffusive flux with temperature is not linear. The relationship between N diffusive flux at the sediment-water interface can be described by Polynomial2D and Lorentz2D models ( R 2 > 0.87)." @default.
- W4321369976 created "2023-02-21" @default.
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- W4321369976 date "2023-02-20" @default.
- W4321369976 modified "2023-10-01" @default.
- W4321369976 title "Effect of water temperature on internal nitrogen release from sediments in the Pearl River Delta region, China" @default.
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- W4321369976 doi "https://doi.org/10.21203/rs.3.rs-2589596/v1" @default.
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