Quantitative identification of nitrate sources in a coastal peri-urban watershed using hydrogeochemical indicators and dual isotopes together with the statistical approaches

Guo, Zhaofeng; C, Yan; Wang, Zaosheng; Xu, Feifei; Yang, Fan

doi:10.1016/j.chemosphere.2019.125364

Cited by 70 publications

(24 citation statements)

References 45 publications

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“…Then precipitation recharge ratio in the four rivers increased by 15.9-65.7%. Guo et al [6] showed that the concentration of NO 3 − -N in the dry season in the study area was 0.55-3.77 mg/L and that in the rainy season it was 0.47-2.65 mg/L. This was due to the heavy rains, which diluted nitrate N concentration in the surface water systems [42,44].…”

Section: Nomentioning

confidence: 82%

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Strong Precipitation and Human Activity Spur Rapid Nitrate Deposition in Estuarine Delta: Multi-Isotope and Auxiliary Data Evidence

Xie

Huang

et al. 2021

IJERPH

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The intensive development of the Yellow River Delta has caused huge transportation of non-point pollutants into the Bohai Sea through source river estuaries and thus poses a considerable threat to eco-environmental security in the region. Long-term irrigation in the Yellow River basin, with occasional heavy rainfall and the related effects of ensuring hydrological processes and human activities in terms of nitrate N transport via surface water systems, is unclear. Using stable isotope (δ2H-H2O and δ18O-H2O, δ15N-NO3− and δ18O- NO3−) and auxiliary geographic data, the ISO source model was run to quantitatively analyze the supply relationship of river systems and the rapid change in the spatial pattern of nitrate N due to heavy rainfall in the estuarine delta. This analysis made clear the dominant contribution of agricultural activities and urbanization to NO3−-N emission, on which basis refined management measures were proposed to deal with NO3− in surface water from the “source-process”. The results of the study show that: (1) The relationship of surface water replenishment in the Yellow River Delta was affected not only by rainfall, irrigation, and other water conservancy measures but also the proportion of water from Yellow River flow declined from the source to estuary; (2) To a certain extent, rainfall diluted the concentration of nitrate N in the river and increased instantaneous flux of nitrate N into the sea, where nitrate N flux continuously increased from upstream to downstream; (3) The rapid deposition of nitrate in the estuary delta was driven by heavy rainfall and human activities such as excessive use of nitrogen fertilizers, rapid urbanization, and livestock waste discharge, and; (4) Scientific measures were needed to realize the interactive effect of the output of non-point source pollutants and the carrying and absorption capacity of coastal fragile ecosystems of the exogenous inputs.

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Section: Nomentioning

confidence: 82%

“…The maximum allowable nitrate concentration in a river is 50 mg/L [4]. In China, 27% of coastal basins do not meet the class IV water quality standard [5], and over 51% of the sea areas are experiencing eutrophication, with the main pollutant being inorganic nitrogen [6].…”

Section: Introductionmentioning

confidence: 99%

Strong Precipitation and Human Activity Spur Rapid Nitrate Deposition in Estuarine Delta: Multi-Isotope and Auxiliary Data Evidence

Xie

Huang

et al. 2021

IJERPH

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“…The chloride ion is stable and generally does not react physically and chemically with other ions in groundwater and aquifer media, therefore it is usually used as a control example. The relationship between the molar ratio of nitrate to chloride ions (n(NO3 -)/n(Cl -)) and the molar concentration of chloride ions (n(Cl -)) is widely used for the identification of NO3sources in surface waters (Guo, 2020). Low chloride ion concentrations (<0.1 mmol/L) and high nitrate to chloride ion ratios (>1) indicate that nitrate may come from the influence of agricultural fertilizers; high chloride ion levels (>3 mmol/L) and low nitrate to chloride ion ratios (<0.1) indicate that nitrate may come from sewage and manure (Jin, 2020).…”

Section: Analysis Of Anthropogenic Input Sources Using Nitrate To Chl...mentioning

confidence: 99%

Pollution characteristics and Groundwater ion source analysis of the last 20 years in a semi-arid region of northwest China

Liu

Ayyamperumal

et al. 2023

Preprint

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Groundwater hydrochemistry analysis can be used to assess the general quality of groundwater as well as how groundwater has changed over time and how anthropogenic activities have affected it. In this study, total dissolved solids (TDS), pH and 10 ions (Na+, K+, Mg2+, Ca2+, Cl-, SO42-, NO3-, CO32-, HCO3- and F-) were measured at 34 sites in the main urban area of Lanzhou, a major city in northwest China, by means of boreholes in 2002 and 2022 respectively. The evolution of groundwater chemistry in the region over a twenty-year period due to mineral weathering and dissolution, ion exchange, and urban activity was explained using a geochemical model, chlor-alkalinity index, and correlations between Cl- and NO3- in the urban area. In addition, statistical methods were used to analyze groundwater ion sources and compare the ion source characteristics over a twenty-year period to reveal the extent to which urbanization and industrialization have influenced groundwater. The results show that overall groundwater quality in the area has improved over the last two decades, with little change in groundwater chemistry type. Furthermore, the chemical ions in groundwater were influenced less by industrialization and more by urban anthropogenic activities, which include not only urban wastewater discharge but also the rapid reduction of groundwater levels due to extensive urban construction activities. It is recommended that groundwater quality be further improved through enhanced municipal management measures, which should focus on the threat posed by groundwater precipitation in addition to considering the control of sewage discharge.

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“…and SIAR model to identify the NO 3 − sources [41], and used the isotope SO 4 2− (δ 34 S and δ 18 O) and SIAR model to identify the SO 4 2− sources [42]. Therefore, in order to formulate effective controlling measures for controlling groundwater pollution, it is necessary to quantitatively identify the sources of pollutants in groundwater in this region.…”

Section: Managerial Implications and Future Researchmentioning

confidence: 99%

Groundwater Chemical Characteristics and Controlling Factors in a Region of Northern China with Intensive Human Activity

Ren

Zhang

2020

IJERPH

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The identification of groundwater chemical characteristics and the controlling factors is of major concern in water environment studies. In this study, we identified the groundwater chemical characteristics, evolution laws and main control factors in a region severely affected by human activities using hydrochemical and multivariate statistical techniques. The results showed that the concentrations of NO3− and TH were the primary pollution factors in the region with intensive human activity because of high concentration and over the standard rates. The major types of groundwater chemistry were HCO3·SO4–Ca and HCO3·SO4–Ca·Mg. The sulfate-type water was as high as 75.0%, 69.2% and 41.2% in the three hydrogeological units. In addition, there were Cl-type and Na-type waters, indicating that the groundwater in this area has been significantly affected by human activities. A principal component analysis (PCA) indicated that the three factors affecting groundwater hydrochemistry in the study area are domestic sewage and fertilizer, water–rock interactions and industrial wastewater. Therefore, we suggest that the government and water environment management departments should prevent the discharge of domestic and industrial wastewater without standardized treatment first in order to effectively prevent the further deterioration of groundwater quality in this area.

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Quantitative identification of nitrate sources in a coastal peri-urban watershed using hydrogeochemical indicators and dual isotopes together with the statistical approaches

Cited by 70 publications

References 45 publications

Strong Precipitation and Human Activity Spur Rapid Nitrate Deposition in Estuarine Delta: Multi-Isotope and Auxiliary Data Evidence

Strong Precipitation and Human Activity Spur Rapid Nitrate Deposition in Estuarine Delta: Multi-Isotope and Auxiliary Data Evidence

Pollution characteristics and Groundwater ion source analysis of the last 20 years in a semi-arid region of northwest China

Groundwater Chemical Characteristics and Controlling Factors in a Region of Northern China with Intensive Human Activity

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