Quantification of spatial and seasonal variations in the proportional contribution of nitrate sources using a multi-isotope approach and Bayesian isotope mixing model

Meghdadi, Aminreza; Javar, Narmin

doi:10.1016/j.envpol.2017.12.078

Cited by 126 publications

(21 citation statements)

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“…According to our research, TH and NO 3 − of the groundwater had significantly exceeded the Grade III standard for groundwater quality in China. Thus, TH and NO 3 − of groundwater in the study area have been significantly affected by human activities, such as domestic sewage and agricultural fertilizer [25,26]. This result is consistent with previous research.…”

Section: Groundwater Chemical Characteristics In a Region With Intensive Human Activitysupporting

confidence: 91%

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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Section: Groundwater Chemical Characteristics In a Region With Intensive Human Activitysupporting

confidence: 91%

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

Ren

Zhang

2020

IJERPH

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“…Future studies on N pollution in Mediterranean wetlands should include additional indicators that allow improved discrimination between N sources with similar δ 15 N values. For example, multiple isotopic approach (Meghdadi and Javar, 2018), together with information on atmospheric N deposition or microbial activity rates, may improve determination of anthropogenic contamination in surface and ground waters.…”

Section: Discussionmentioning

confidence: 99%

Stable isotopes in helophytes reflect anthropogenic nitrogen pollution in entry streams at the Doñana World Heritage Site

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Ramírez

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et al. 2019

Ecological Indicators

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A B S T R A C T Nitrogen (N) loading from anthropogenic activities is contributing to the eutrophication and degradation of wetlands worldwide. Doñana (southwestern Spain), includes a dynamic marshland protected as a UNESCO World Heritage Site, which has a catchment area exposed to increasing N inputs from intensive agriculture and poorly treated urban wastewaters. Identifying the sources of N entering this iconic wetland complex is vital for its conservation. To this end, we combined multiyear (2014-2016), spatially-explicit data on N concentration in water samples with measurements on the relative abundance of N stable isotopes (δ 15 N) in Bolboschoenus maritimus and Typha domingensis, two dominant helophytes (i.e. emergent macrophytes) in the Doñana marsh and entry streams. Overall, plant tissues from entry streams showed higher δ 15 N values than those from the marsh, particularly in those streams most affected by urban wastewaters. Isotopic values did not differ between plant species. Water samples affected by isotopically-enriched urban wastewaters and other diffuse organic N inputs (e.g. livestock farming) had relatively high Dissolved Inorganic Nitrogen (DIN) concentrations. In contrast, in streams mainly affected by diffuse N pollution from greenhouse crops, high DIN values were related to isotopically-depleted N sources (e.g., inorganic fertilizers). Thus, helophytes, in combination with other parameters such as N concentration in water or land cover, can be valuable indicators of anthropogenic pressures in Mediterranean wetlands. Helophytes have widespread distributions, and can be readily sampled even when water is no longer present. However, identification of specific N sources through helophyte δ 15 N values is limited when key potential N sources are isotopically undistinguishable (e.g. fertilizers vs. atmospheric sources). cyanobacterial blooms, hypoxia, expansion of floating plants and, ultimately

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“…Cl is a good indicator of sewage contamination of groundwater as it is not dependent on the physical, chemical and microbiological processes ( Fig. 6) (Xing and Liu, 2016;Wei et al, 2017;Meghdadi and Javar, 2018). Cl (Fig.…”

Section: The Parameters CLmentioning

confidence: 99%

Sources and health risk assessments of nitrate in groundwater, West of Tahta area, Sohag, Egypt

et al. 2020

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Due to natural and anthropogenic human activities in arid and semi-arid regions, groundwater will continuously suffer from severe contaminations such as increases in nitrate levels. Groundwater contamination poses serious threats to the environment and human health. In the current study, 23 groundwater samples were collected from the desert zone around the wastewater treatment plant west of Tahta area, Sohag, Egypt. The samples were chemically and bacteriologically analyzed to quantify the sources and potential risk of nitrate in groundwater to the health of adults, children and infants. The nitrate showed wide spatial variability in the studied area, with values going from 0.38 up to 59 mg/L. Based on the bacteriological, principal component, NO 3 and NO 3-/Clanalyses, nitrate in the southwestern parts around the wastewater treatment plant developed from the sewage contamination while the northeastern and southern parts are mainly due to contamination from the agricultural activities and organic wastes. The non-carcinogenic hazard quotients (HQ) values of 78% of infants, 70% children and 4% of adults were higher than the safety level (i.e., HQs>1), suggesting severe health effects on human health. Proper management of wastewater disposal activities and application of fertilizers are required to reduce groundwater contamination in Egypt and globally.

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Quantification of spatial and seasonal variations in the proportional contribution of nitrate sources using a multi-isotope approach and Bayesian isotope mixing model

Cited by 126 publications

References 84 publications

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

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

Stable isotopes in helophytes reflect anthropogenic nitrogen pollution in entry streams at the Doñana World Heritage Site

Sources and health risk assessments of nitrate in groundwater, West of Tahta area, Sohag, Egypt

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