Fluoride and nitrate contamination of groundwater in the Loess Plateau, China: Sources and related human health risks

Su, He; Kang, Weidong; Li, Yanrong; Li, Zhi

doi:10.1016/j.envpol.2021.117287

Cited by 81 publications

(15 citation statements)

References 67 publications

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“…Hyporheic water in the treatment reach was not only rich in dissolved elements, but was also characterized by higher hydrogen SIR values compared to both types of water in the upstream control reach, which clearly indicated that the origin of groundwater was not infiltrated surface water into the river bed, which is similar to the case of Marmonier et al (2020). We support the strength of an approach combining isotopic and water quality signatures for water source determination in the hydrological cycle (Torres-Martínez et al, 2020; Su et al, 2021).…”

Section: Discussionsupporting

confidence: 68%

“…The levels of nitrate observed were high and were comparable with the average levels reported in human-affected groundwater in farmlands and livestock fields in Japan (1.4 to 20 mg/L as NO 3− N; 3.15 to 45 mg/L as nitrate) (Yabusaki, 2010). Globally, human activities, such as urbanization and agriculture, have elevated nitrate levels in water to comparable levels (Drake & Bauder, 2005; Negishi et al, 2019; Su et al, 2021). Thus, it is plausible that upwelling hyporheic water partially affected by human-introduced nitrogen was assimilated into the benthic community through primary producer uptake followed by consumer resource consumption, creating noticeable hotspots of trophic linkages in the lowland mainstem of the Toyohira River.…”

Section: Discussionmentioning

confidence: 99%

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An urbanized phantom tributary subsidizes river-riparian communities of mainstem gravel-bed river

Negishi,

Song,

Matsubara

et al. 2023

Preprint

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Urbanization transforms natural river channels, and some rivers become invisible over time. How and whether the subsurface domains of the original waterways and aquifers connecting them (a phantom of historical landscape) are functional is not known. This study examined the effects of tributary groundwater (GW) inflow on the response of river-riparian organisms in an alluvial mainstem river in northern Japan, where the tributary disappeared over the course of urban landscape transformation.A 2.8-km long lowland segment of the mainstem gravel-bed river was examined for water properties and the river-riparian food web. In addition, watershed-wide water sampling was conducted to isotopically distinguish several types of groundwater that contributed to the hyporheic water in the study segment. There was a clear effect of altitude on the hydrogen/oxygen stable isotope ratios in the river water collected across the watershed.Groundwater unique both in chemical sand isotopic signatures in several spots occurred within the study segment, and its properties resembled to and its upwelling locations matched groundwater from a tributary river whose surface channel has disappeared 60 years ago. Positive numerical increases in abundance and/or a sign of nitrogen transfer in river riparian communities (algae, invertebrates, and riparian trees) originating from groundwater high in nitrate with elevated nitrogen stable isotope ratios were found.This study demonstrated that tributary groundwater with unique chemical properties manifested by an urban watershed river network continued to have cascading effects on biota across the river-riparian boundary in the mainstem river, even after urbanization transformed the tributary into a historically lost phantom river. We highlighted the legacy effects of landscape transformation in the subsurface domain and the significance of scrutinizing the past landscape and hydrological connectivity at the watershed scale in urban environments.

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Section: Discussionsupporting

confidence: 68%

Section: Discussionmentioning

confidence: 99%

An urbanized phantom tributary subsidizes river-riparian communities of mainstem gravel-bed river

Negishi,

Song,

Matsubara

et al. 2023

Preprint

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“…Long-term F − accumulates in human teeth and bones under a high-fluoride environment, which can damage human soft tissue and intellectual development and even lead to an increased risk of tumors and leukemia (Mumtaz et al, 2015;Durrani and Farooqi, 2021;Senthilkumar et al, 2021). According to the latest reports, long-term, excessive intake of F − has also been linked to adverse cancer and distortion (Smith et al, 1979;Seraj et al, 2012;Nikiforova 1982;Su et al, 2021). Moreover, previous studies found that plants in environments with high F − concentrations may have impacted growth, morphological, photosynthetic and metabolic characteristics (Reddy and Kaur, 2008;Bhargava and Bhardwaj, 2010;Bustingorri et al, 2016;Meng and Wu 1996;Gao et al, 1998;Elloumi et al, 2015;Zhong et al, 2014;Adeyeye et al, 2021).…”

Section: Introductionmentioning

confidence: 99%

Fluorine in shallow groundwater in China: A review of distribution, occurrence and environmental effects

Zhao

Zhang

et al. 2023

Front. Earth Sci.

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With rapid economic development and the increasing demand for drinking water, a large amount of groundwater is exploited, resulting in a high F− content in groundwater, which is harmful to the environment and human body. In this study, 5,464 data points of fluoride in shallow groundwater were collected, and the F− content distribution, occurrence form and environmental impact of shallow groundwater were discussed. The results showed that 1) the F− content in shallow groundwater in China ranged from 0 to 60 mg/L, with a mean content of 0.90 mg/L; the lowest average F− content in shallow groundwater in Southwest China was 0.36 mg/L; South China (1.20 mg/L), Northeast China (1.25 mg/L) and Northwest China (1.25 mg/L) were considered high-fluoride areas, and North China (0.93 mg/L), East China (0.67 mg/L) and Central China (0.80 mg/L) were considered low-fluoride areas. The mean F− content in groundwater differed between provinces and cities. 2) The F− in shallow groundwater mainly occurred in ionic, complex ionic and organic fluoride molecular states. 3) The influence of a high F− content in shallow groundwater on the environment was mainly manifested in the increase in water F− concentration and soil F− and vegetable F− content. The influence of a high F− content on the human body was mainly manifested in an increase in urinary F− content in children, a high prevalence of dental fluorosis in children, an increase in skeletal fluorosis rate in adults with age, and an influence on cognitive function of older adults. These results provide a basis for F− pollution control and high-fluoride water treatment.

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“…The two principal sources of Fin groundwater are anthropogenic (Borzi et al, 2015;Mamatchi et al, 2019;Su et al, 2021;Yadav et al, 2021;Zango et al, 2021;Huang et al, 2022) and geogenic in origin (Currell et al, 2011;He X et al, 2013;Xiao et al, 2015;Dehbandi et al, 2018;Hao et al, 2021b;Duggal and Sharma, 2022). Previous studies have found that geogenic processes are frequently responsible for elevated Fconcentrations in groundwater (Dehbandi et al, 2018;Emenike et al, 2018;Rashid et al, 2018;Hao et al, 2021c;Duggal and Sharma, 2022;Huang et al, 2022).…”

Section: Introductionmentioning

confidence: 99%

“…Previous studies showed that groundwater with high Fconcentrations typically had low NO 3 − concentrations (>5 mg/L) (Hao et al, 2021c;Mwiathi et al, 2022). The presence of more than 5 mg/L NO₃⁻ in 36% of the high-F-deep groundwater indicated the impacts of anthropogenic activities such as fertilizer application and waste discharge from agricultural, domestic, and industrial sources (Ali et al, 2019;Su et al, 2021;Yadav et al, 2021). The highest observed deep groundwater NO₃⁻ concentration was 8.17 mg/L in the Buertai mining area.…”

mentioning

confidence: 96%

Seasonal distribution of deep groundwater fluoride, geochemical factors and ecological risk for irrigation in the Shendong mining area, China

Hao

Wang

et al. 2022

Front. Environ. Sci.

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High-fluoride (F-) deep groundwater in the vicinity of mining areas poses severe ecological risks. In this study, we aimed to characterize and reveal the seasonal distribution and influencing factors of elevated F- concentrations in the deep groundwater in the Shendong mining area, Shaanxi and Inner Mongolia province, China. In addition, the ecological risks associated with F- concentrations in irrigation water were assessed. During the wet and dry seasons, the F- concentrations in mine water samples ranged between 0.12 and 13.92 mg/L (mean: 4.24 mg/L) and between 0.20 and 17.58 mg/L (mean: 4.59 mg/L), respectively. The F- content of mine water was clearly higher during the dry season than that during the wet season. F- concentrations in deep groundwater exhibited consistent spatial distributions during both the dry and wet seasons, with an evident increase from southeast to northwest. The dissolution and precipitation of F--bearing and calcium minerals, cation exchange, competitive adsorption, evaporation, and anthropogenic activities during both the wet and dry seasons were identified as important factors influencing F- concentrations in deep groundwater. In addition, the ecological assessment revealed that 100% and 88.89% of low-F- deep groundwater samples were suitable for practices during the dry and wet seasons, respectively. In contrast 84.00% and 84.62% of high-F- deep groundwater samples were unsuitable for irrigation practices during the dry and wet seasons, respectively. This research provided useful prevention policies of deep groundwater extraction to mitigate environment problems associated with excessive F- irrigation.

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Fluoride and nitrate contamination of groundwater in the Loess Plateau, China: Sources and related human health risks

Cited by 81 publications

References 67 publications

An urbanized phantom tributary subsidizes river-riparian communities of mainstem gravel-bed river

An urbanized phantom tributary subsidizes river-riparian communities of mainstem gravel-bed river

Fluorine in shallow groundwater in China: A review of distribution, occurrence and environmental effects

Seasonal distribution of deep groundwater fluoride, geochemical factors and ecological risk for irrigation in the Shendong mining area, China

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