Nitrate and Nitrite Pollution in the Jiantan River in the Three Gorges Reservoir Area

Liu, Xiangchao; Zhang, Bo

doi:10.1109/icbbe.2010.5516985

Cited by 4 publications

(4 citation statements)

References 16 publications

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“…As discussed in Section 3.1, NO 3 – –N was the major component of DIN and TDN, with its concentration significantly exceeding that of the natural background (0.08–0.12 mg/L), suggesting the presence of additional N input sources. Previous studies have shown that the industries’ wastewater exhibits higher NO 3 – –N and lower Cl – , which is reversed in the cropland . As depicted in Figure b, the NO 3 – –N/Cl – values of the YL samples were closer to the end-member of agricultural activities, whereas the CQ and FW samples displayed a stronger association with urban activities.…”

Section: Results and Discussionmentioning

confidence: 92%

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Nutrient Dynamics under the Coupling Effects of Damming and Urbanization in the Three Gorges Reservoir: Status, Sources, and Driving Factors

Wang,

Han,

Wang

et al. 2024

ACS Earth Space Chem.

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The coupling effect of damming and urbanization on nutrient dynamics renders the aquatic environment sensitive and vulnerable, posing a significant global concern. However, the role of damming as a source or sink of nutrients remains uncertain. In this study, river water samples were collected in the Three Gorges Reservoir (TGR), which is recognized as the world's largest hydropower engineering. By integrating solute chemistry and flux budget modeling, the status, source, and transformation of riverine nutrients were revealed, and the interplay between water storage and human inputs on TGR nutrient dynamics was discussed. The concentrations of TDN and DSi were 100.2 ± 46.1 μmol/L and 115.7 ± 14.1 μmol/L, respectively. NO 3 − −N (77.9 ± 64.1 μmol/L) was the main species of TDN, with NH 4 + −N and dissolved organic nitrogen accounting for only 2.5 and 19.7%, respectively. DSi was attributed to silicate weathering, while riverine NO 3 − −N exhibited a significant influence from anthropogenic inputs. About 71.7% of NH 4 + −N was retained or converted to NO 3 − −N by nitration along the river. Evidence from the significant correlation (p < 0.05) between NO 3 − −N/NH 4 + −N and d-excess suggests that the evaporation process accelerated by damming promotes nitrification. Through the anthropogenic net nitrogen input model, atmospheric nitrogen deposition was the primary factor affecting nitrogen flux in TGR river water, highlighting the critical impact of urbanization. The estimated contribution fluxes of stored nitrogen from 1997 to 2020 exhibited a limited contribution ratio and decrease yearly, supporting that water level rise from damming promotes the release of stored nitrogen. This study enhances the comprehension of the anthropogenic impacts on the nutrient biogeochemical cycle in damming rivers, providing enlightenment for environmental health management in large reservoirs.

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Section: Results and Discussionmentioning

confidence: 92%

“…(b) Response of the ratio of NO 3− −N/ Cl − to different anthropogenic sources. The data of urban and agriculture end-member were according to Liu et al59 and Li et al,60 respectively.…”

mentioning

confidence: 99%

Nutrient Dynamics under the Coupling Effects of Damming and Urbanization in the Three Gorges Reservoir: Status, Sources, and Driving Factors

Wang,

Han,

Wang

et al. 2024

ACS Earth Space Chem.

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“…These species occur widely in wastewater and surface waters. Besides, the concentration of NO 2 – in surface waters at the downstream ranges from 0.174 to 0.181 mg-N/L, and up to 1 mg-N/L can be found in surface waters with agriculture runoff. − NO 2 – is also ubiquitous in biologically treated wastewaters where it forms due to incomplete nitrification/denitrification, with the concentration at mg-N/L level or lower. , Thus, this study addresses an overlooked photochemical pathway that can lead to the formation of NDMA in sunlit surface waters, especially those receiving WWTP effluents.…”

Section: Introductionmentioning

confidence: 98%

Formation of N-Nitrosodimethylamine by Sunlight Irradiation of Dimethylamine Compounds in the Presence of Nitrite

Yang,

Dong,

Wang

et al. 2023

ACS EST Water

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N-Nitrosodimethylamine (NDMA) is a disinfection byproduct and a probable human carcinogen formed during water treatment processes. While its generation in engineered systems has been extensively explored, its formation in natural environments is inadequately understood. This study demonstrates that compounds with dimethylamine (DMA) functionality exposed to sunlight irradiation in the presence of nitrite (NO 2 − ) react to form NDMA. The molar yields of NDMA ranged from 0.006 to 0.035% after 6 h irradiation. The radicals generated by the photolysis of NO 2 − , notably • OH, NO • , and NO 2 •, play critical roles in this process. Three reaction pathways are involved in the NDMA formation. In the first and second pathways, nitrogen oxide radicals couple or dimerize to form the nitrosating agents N 2 O 3 and N 2 O 4 , which attack the DMA moiety, yielding NDMA. In the third pathway, the DMA moiety is oxidized by • OH via Habstraction to produce a nitrogen-centered radical (CH 3 N • CH 3 ) which, followed by the addition of a NO • , yields NDMA. Radical quenching experiments combined with theoretical calculations suggest that the • OH/H-abstraction pathway is more favorable. Given that many environmental contaminants contain DMA functionalities, the photochemical formation pathway of NDMA in the sunlit surface waters may be important for aquatic environments.

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“…Liangtan River is one of the main tributaries from the right bank of Jialing River downstream with a total length of 88km, with average annual flow of 6.6m 3 /s. In recent years, Liangtan River is polluted seriously: the water quality is worse than Class V and belongs to heavy pollution [8]. Besides of livestock and domestic pollution, the quality deterioration of the Liangtan River is mainly attributable to the sediment pollution in the river and its pollution load accounts for 10% of overall pollution.…”

Section: Introductionmentioning

confidence: 99%

Pollution and Potential Biological Toxicity Assessment Using Heavy Metals from Surface Sediments of Liangtan River, Chongqing, China

Liu

Zheng

Peng

et al. 2011

AMM

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The concentrations of heavy metals (Cu, Zn, Pb, Cd, Ni, Cr, As) in the surface sediment of Liangtan River were determined by using atomic absorption spectrometry (AAS) and atomic fluorescence spectrometry (AFS), and the toxic effects and sediment pollution assessment were conducted systematically by using Sediment Quality Guidelines (SQG), Hakanson Potential Ecological Risk Index. Moreover, the underlying source of heavy metal was analyzed. The results indicated that the concentrations of Cu, Zn, Pb, Cd, Ni, Cr, As were 29.4-158.1, 40.2-291.3, 23.4-148.2, 0.01-0.79, 6.4-106.2, 17.9-170.6, 1.3-45.1mg/kg respectively. Base on the SQG, besides Cd concentrations of few sampling sites were above the threshold effects level (TEL), the rest heavy metal concentrations of most sampling sites were all between TEL and the probable effects level (PEL), and biological toxicity effects may take place, especially Baishiyi, Hangu and Huilongba, harmful biological toxicity effects may frequently take place. Compared to background values of soil heavy metals in the Three Gorges Reservoir Region, the heavy metals in Liangtan River sediments showed higher ecological risk, and the ecological risk of the heavy metals, arranged from the highest to lowest pollution degree, was as follows Cd, As, Cu, Pb, Ni, Zn, Cr.

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Nitrate and Nitrite Pollution in the Jiantan River in the Three Gorges Reservoir Area

Cited by 4 publications

References 16 publications

Nutrient Dynamics under the Coupling Effects of Damming and Urbanization in the Three Gorges Reservoir: Status, Sources, and Driving Factors

Nutrient Dynamics under the Coupling Effects of Damming and Urbanization in the Three Gorges Reservoir: Status, Sources, and Driving Factors

Formation of N-Nitrosodimethylamine by Sunlight Irradiation of Dimethylamine Compounds in the Presence of Nitrite

Pollution and Potential Biological Toxicity Assessment Using Heavy Metals from Surface Sediments of Liangtan River, Chongqing, China

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