Autotrophic denitrification supported by biotite dissolution in crystalline aquifers: (2) transient mixing and denitrification dynamic during long-term pumping

Roques, Clément; Aquilina, Luc; Boisson, Alexandre; Vergnaud-Ayraud, Virginie; Labasque, Thierry; Longuevergne, Laurent; Laurencelle, Marc; Dufresne, Alexis; Dreuzy, Jean‐Raynald de; Pauwels, Hélène; Bour, Olivier

doi:10.1016/j.scitotenv.2017.11.104

Cited by 17 publications

(10 citation statements)

References 36 publications

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“…Alternatively, analytical solutions for the depth versus age relationship (42) could be used to determine the depth of the reactive zone. Existing NO3− stratum reaction times measured in Brittany show a similar range as determined here, ranging within a few hours and several years depending on the electron donor availability (47–51).…”

Section: Resultssupporting

confidence: 79%

“…Apparent reaction times indicate a late start pattern that is supported by detailed vertical profiles (substrata scale) (23, 42) showing the electron donor availability and degradation of O2 and NO3− with depth. NO3− can be quickly reduced when it encounters reactive strata shown for aquifers worldwide (47, 53, 54), providing additional evidence on the prevalence of deeper reactivity.…”

Section: Resultsmentioning

confidence: 91%

“…The relations of apparent O2 and NO3− reaction times obtained from the unconfined crystalline aquifer located in an agricultural area in Brittany, France (6), show a predominance of the late start pattern with apparent O2 reaction times larger than apparent NO3− reaction times (88% of the sampling locations; SI Appendix , section S1). The dominance of the late start pattern appears to be driven by biotite and sulfide minerals, which are found in borehole cuttings from deeper fractured zones (44), with reactions occurring between the weathered and fractured zones (44–48). The time to enter the reactive zone, τ enter , is verified by comparing the depth when a water parcel reaches the reactive zone and the depth of the interface between the weathered and fractured zones (Fig.…”

Section: Resultsmentioning

confidence: 99%

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Stratification of reactivity determines nitrate removal in groundwater

Kolbe

Dreuzy

Abbott

et al. 2019

Proc. Natl. Acad. Sci. U.S.A.

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SignificanceAlthough groundwater is a critical source of drinking water and irrigation, it has been polluted worldwide by agriculture, industry, and domestic activity. Because assessing groundwater quality and recovery rates is challenging, we developed a method for determining where and how quickly nitrate is removed in aquifers using just a few point measurements of groundwater chemistry. This methodology opens new avenues for characterizing catchment-scale nutrient dynamics, including nitrogen, carbon, and silica, with existing datasets for ecosystems around the globe. Understanding the subsurface structure of reactivity would also improve estimates of recovery time frames for polluted ecosystems and inform sustainable limits for anthropogenic activity.

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Section: Resultssupporting

confidence: 79%

Section: Resultsmentioning

confidence: 91%

Section: Resultsmentioning

confidence: 99%

See 1 more Smart Citation

Stratification of reactivity determines nitrate removal in groundwater

Kolbe

Dreuzy

Abbott

et al. 2019

Proc. Natl. Acad. Sci. U.S.A.

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“…Piper diagrams are widely used to display dominant hydrochemical ions, and are useful for revealing the source of the hydrochemical composition 40 – 42 . All of the water samples were of the calcium bicarbonate type (Ca-HCO 3 ) (Fig.…”

Section: Discussionmentioning

confidence: 99%

Hydrochemical composition and potentially toxic elements in the Kyrgyzstan portion of the transboundary Chu-Talas river basin, Central Asia

Abuduwaili

et al. 2020

Sci Rep

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Water chemistry and the assessment of health risks of potentially toxic elements have important research significance for water resource utilization and human health. However, not enough attention has been paid to the study of surface water environments in many parts of Central Asia. Sixty water samples were collected from the transboundary river basin of Chu-Talas during periods of high and low river flow, and the hydrochemical composition, including major ions and potentially toxic elements (Zn, Pb, Cu, Cr, and As), was used to determine the status of irrigation suitability and risks to human health. The results suggest that major ions in river water throughout the entire basin are mainly affected by water–rock interactions, resulting in the dissolution and weathering of carbonate and silicate rocks. The concentrations of major ions change to some extent with different hydrological periods; however, the hydrochemical type of calcium carbonate remains unchanged. Based on the water-quality assessment, river water in the basin is classified as excellent/good for irrigation. The relationship between potentially toxic elements (Zn, Pb, Cu, Cr, and As) and major ions is basically the same between periods of high and low river flow. There are significant differences between the sources of potentially toxic elements (Zn, Pb, Cu, and As) and major ions; however, Cr may share the same rock source as major ions. The risk assessment revealed low non-carcinogenic and carcinogenic risks for human health; however, the maximum carcinogenic risk for As exceeded the allowable value, which requires further consideration. These results provide a scientific basis for the management of agricultural irrigation uses and also infill existing gaps regarding the hydrochemical composition in the Chu-Talas river basin, Central Asia.

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“…Piper diagram[50] is usually plotted to classify the major ion composition and to separate the hydrogeochemical facies[51][52][53][54]. The Gibbs diagram[23] reflects the ratios of cations [Na + /(Na + + Ca 2+ )] and anions [Cl -/(Cl -+ HCO 3…”

mentioning

confidence: 99%

Hydrochemical Characteristics and Water Quality Assessment for the Upper Reaches of Syr Darya River in Aral Sea Basin, Central Asia

Abuduwaili

et al. 2019

Water

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Based on water sampling of the upper reaches of the Syr River and its tributaries from the parts of Aral Sea Basin in Kyrgyzstan, the chemical compositions of river waters were systematically analyzed for revealing the hydrochemical characteristics and evaluating the water quality. Research indicates that there are some differences in ion concentration between the low-flow season (LFS) and high-flow season (HFS), but the hydrochemical classification reflected that all water samples fall in the calcium bicarbonate category, except that only three samples fall in the not dominant category during the LFS. The water quality classification shows that the water samples fall in the excellent to good categories for irrigation use. The analysis shows that the main ions of river waters come from the weathering of rocks, and the dissolution of carbonates is higher than that of silicates. Human activities have had an impact on the waterbody, especially inferred from the indicators of NH4-N and fecal coliform (FC). FC groups were detected in some rivers, in which the detection rate at the high-water level increased. The contents of potentially toxic elements are lower than international drinking water standards, but there are clustering differences between the LFS and HFS. There may be anthropogenic intrusions of Cu, Pb, and Zn during the LFS period and of Cu, Pb, Zn, and Cd during the HFS period. The results fill the gaps in the study of the hydrochemical composition and water quality assessment in the Aral Sea Basin and will also provide a basis for water resource management and for the study of water quality evolution in the future.

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Autotrophic denitrification supported by biotite dissolution in crystalline aquifers: (2) transient mixing and denitrification dynamic during long-term pumping

Cited by 17 publications

References 36 publications

Stratification of reactivity determines nitrate removal in groundwater

Stratification of reactivity determines nitrate removal in groundwater

Hydrochemical composition and potentially toxic elements in the Kyrgyzstan portion of the transboundary Chu-Talas river basin, Central Asia

Hydrochemical Characteristics and Water Quality Assessment for the Upper Reaches of Syr Darya River in Aral Sea Basin, Central Asia

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