2017
DOI: 10.1002/2016jg003463
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Nitrate reduction mechanisms and rates in an unconfined eogenetic karst aquifer in two sites with different redox potential

Abstract: This study integrates push‐pull tracer tests (PPTT) with microbial characterization of extracted water via quantitative polymerase chain reaction (qPCR) and reverse transcriptase qPCR (RT‐qPCR) of selected functional N transformation genes to quantify nitrate reduction mechanisms and rates in sites with different redox potential in a karst aquifer. PPTT treatments with nitrate (AN) and nitrate‐fumarate (ANC) were executed in two wells representing anoxic and oxic geochemical end‐members. Oxic aquifer zero‐orde… Show more

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Cited by 40 publications
(16 citation statements)
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“…This mixing could effectively decouple the local measured redox state from the conditions where denitrification occurred. Alternatively, local reduction zones in microbial biofilms on aquifer substrates may have created favourable conditions where transformations could occur locally despite high DO concentrations in the bulk aquifer, as was observed by Biesterfeld, Farmer, Figueroa, Parker, and Russell () and Henson et al ().…”
Section: Discussionmentioning
confidence: 90%
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“…This mixing could effectively decouple the local measured redox state from the conditions where denitrification occurred. Alternatively, local reduction zones in microbial biofilms on aquifer substrates may have created favourable conditions where transformations could occur locally despite high DO concentrations in the bulk aquifer, as was observed by Biesterfeld, Farmer, Figueroa, Parker, and Russell () and Henson et al ().…”
Section: Discussionmentioning
confidence: 90%
“…The available number of sample locations may have prevented detection of a significant correlation. However, in direct injection experiments in Wells 9 and 16, unexplained nitrate losses were observed under oxic and anoxic conditions with and without carbon (Henson et al, ). Thus, reducing conditions in aquifer samples may not be required to facilitate denitrification.…”
Section: Discussionmentioning
confidence: 99%
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“…Their main purpose is to determine microbial metabolic activity (natural attenuation processes) and/or to assess redox conditions. Numerous redox-sensitive tracers have been applied for laboratory and field scale investigations, such as inorganic electron acceptors (e.g., O 2 , NO 3 − , SO 4 2− , CO 3 2− ) [106][107][108][109][110][111][112][113][114][115][116], organic electron donors (e.g., low-molecular weight alcohols and sugars [117] and benzoate [118][119][120]), or the organic electron acceptor resazurin [8,[121][122][123][124][125][126][127][128].…”
Section: One Phase Degradation Sensitive Tracersmentioning
confidence: 99%