Comparison of tracer methods to quantify hydrodynamic exchange within the hyporheic zone

Engelhardt, Irina; Piepenbrink, Matthias; Trauth, Nico; Stadler, Susanne; Kludt, Christoph; Schulz, Manoj; Schüth, Christoph; Ternes, Thomas A.

doi:10.1016/j.jhydrol.2011.01.033

Cited by 72 publications

(39 citation statements)

References 45 publications

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“…Similar values (0.05-2.6 μg/L) were found in a groundwater monitoring program in Bavaria, Germany [50]. Even higher ACE concentrations were reported by Prasse et al [32] in two German groundwater samples, 12 and 6.9 μg/L, for an oxic and an anoxic groundwater, respectively, and by Engelhard et al [33] (approximately 8-13.5 μg/L, from [16] for groundwater aquifers with known wastewater impact or in shallow groundwater samples along wastewater-impacted streams. Van Stempvoort et al [36] detected high ACE levels in the wastewater plume of a septic tank of a campground of the order of several tens of micrograms per liter.…”

Section: Surface Watersupporting

confidence: 83%

“…Direct injection after filtration was reported in [16,27,32,33]. Other authors [12,29,34] applied online SPE prior to HPLC-electrospray ionization (ESI) MS/MS analysis.…”

Section: Lc-ms/ms and Lc-hrms Methodsmentioning

confidence: 99%

“…Except for the work reported in the aforementioned articles [16,27,32,33], most groups extract artificial sweeteners by online or offline SPE from aqueous environmental samples. Besides concentrating the artificial sweeteners, this step removes matrix constituents, which may affect LC-MS/ MS detection by matrix suppression or enhancement.…”

Section: Lc-ms/ms and Lc-hrms Methodsmentioning

confidence: 99%

“…Groundwater and riverbank filtrate Different direct and indirect routes of groundwater contamination with artificial sweeteners from wastewater or waste sources have been considered in the literature: infiltration of wastewater-influenced surface waters [12,15,25,32,33,50,51], percolation of treated wastewater in soil aquifer treatment (SAT) [13,15], impact of landfill leachate [16], septic systems [16,36], municipal wastewater ponds [16], municipal wastewater exfiltration cells [16], and percolation of manure on agricultural land [26].…”

Section: Surface Watermentioning

confidence: 99%

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Artificial sweeteners—a recently recognized class of emerging environmental contaminants: a review

2012

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An overview is given of existing trace analytical methods for the determination of seven popular artificial sweeteners [acesulfame (ACE), aspartame, cyclamate (CYC), neotame, neohesperidine dihydrochalcone, saccharin (SAC), and sucralose (SUC)] from aqueous environmental samples. Liquid chromatography-electrospray ionization tandem mass spectrometry and liquid chromatography-electrospray ionization high-resolution mass spectrometry are the methods most widely applied, either directly or after solid-phase extraction. Limits of detection and limits of quantification down to the low nanogram per liter range can be achieved. ACE, CYC, SAC, and SUC were detected in wastewater treatment plants in high microgram per liter concentrations. Per capita loads of individual sweeteners can vary within a wide range depending on their use in different countries. Whereas CYC and SAC are usually degraded by more than 90% during wastewater treatment, ACE and SUC pass through wastewater treatment plants mainly unchanged. This suggests their use as virtually perfect markers for the study of the impact of wastewater on source waters and drinking waters. In finished water of drinking water treatment plants using surface-water-influenced source water, ACE and SUC were detected in concentrations up to 7 and 2.4 μg/L, respectively. ACE was identified as a precursor of oxidation byproducts during ozonation, resulting in an aldehyde intermediate and acetic acid. Although the concentrations of ACE and SUC are among the highest measured for anthropogenic trace pollutants found in surface water, groundwater, and drinking water, the levels are at least three orders of magnitude lower than organoleptic threshold values. However, ecotoxicology studies are scarce and have focused on SUC. Thus, further research is needed both on identification of transformation products and on the ecotoxicological impact of artificial sweeteners and their transformation products.

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Section: Surface Watersupporting

confidence: 83%

“…Direct injection after filtration was reported in [16,27,32,33]. Other authors [12,29,34] applied online SPE prior to HPLC-electrospray ionization (ESI) MS/MS analysis.…”

Section: Lc-ms/ms and Lc-hrms Methodsmentioning

confidence: 99%

Section: Lc-ms/ms and Lc-hrms Methodsmentioning

confidence: 99%

Section: Surface Watermentioning

confidence: 99%

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Artificial sweeteners—a recently recognized class of emerging environmental contaminants: a review

2012

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“…A number of studies have shown the persistence of microorganics from surface water into groundwater, albeit at lower concentrations (Banzhaf et al, In press;Heberer et al, 2008;Lewandowski et al, 2011). Engelhardt et al (2011) used artificial sweeteners and Xray contrast media as tracers for HZ exchange but found them to have been attenuated within 200 m of the river bank. These studies were generally on lowland rivers and the apparent removal of organic pollutants within the HZ of a Chalk stream was surprising.…”

Section: Figure 7amentioning

confidence: 99%

Fingerprinting groundwater pollution in catchments with contrasting contaminant sources using microorganic compounds

Stuart

Lapworth

Thomas

et al. 2014

Science of The Total Environment

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Hyporheic transport and biogeochemical reactions in pool‐riffle systems under varying ambient groundwater flow conditions

et al. 2014

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At the interface between stream water, groundwater, and the hyporheic zone (HZ), important biogeochemical processes that play a crucial role in fluvial ecology occur. Solutes that infiltrate into the HZ can react with each other and possibly also with upwelling solutes from the groundwater. In this study, we systematically evaluate how variations of gaining and losing conditions, stream discharge, and pool-riffle morphology affect aerobic respiration (AR) and denitrification (DN) in the HZ. For this purpose, a computational fluid dynamics model of stream water flow is coupled to a reactive transport model. Scenarios of variations of the solute concentration in the upwelling groundwater were conducted. Our results show that solute influx, residence time, and the size of reactive zones strongly depend on presence, magnitude, and direction of ambient groundwater flow. High magnitudes of ambient groundwater flow lower AR efficiency by up to 4 times and DN by up to 3 orders of magnitude, compared to neutral conditions. The influence of stream discharge and morphology on the efficiency of AR and DN are minor, in comparison to that of ambient groundwater flow. Different scenarios of O 2 and NO 3 concentrations in the upwelling groundwater reveal that DN efficiency of the HZ is highest under low upwelling magnitudes accompanied with low concentrations of O 2 and NO 3 . Our results demonstrate how ambient groundwater flow influences solute transport, AR, and DN in the HZ. Neglecting groundwater flow in stream-groundwater interactions would lead to a significant overestimation of the efficiency of biogeochemical reactions in fluvial systems.

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Comparison of tracer methods to quantify hydrodynamic exchange within the hyporheic zone

Cited by 72 publications

References 45 publications

Artificial sweeteners—a recently recognized class of emerging environmental contaminants: a review

Artificial sweeteners—a recently recognized class of emerging environmental contaminants: a review

Fingerprinting groundwater pollution in catchments with contrasting contaminant sources using microorganic compounds

Hyporheic transport and biogeochemical reactions in pool‐riffle systems under varying ambient groundwater flow conditions

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