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| Groundwater denitrification intensity based on an integrated analysis method |
| Received:December 27, 2018 |
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| KeyWord:groundwater;denitrification intensity;aquifer medium;sampling depth;dissolved oxygen;integrated analysis |
| Author Name | Affiliation | E-mail | | HUAN Huan | Chinese Research Academy of Environmental Sciences, State Environmental Protection Key Laboratory of Simulation and Control of Groundwater Pollution, Beijing 100012, China | | | ZHANG Jun-jun | Guangdong Geological Bureau, Guangzhou 510080, China | | | YANG Yu | Chinese Research Academy of Environmental Sciences, State Environmental Protection Key Laboratory of Simulation and Control of Groundwater Pollution, Beijing 100012, China | | | MA Xiong-fei | China University of Geosciences, Beijing 100083, China | | | LIAN Xin-ying | Chinese Research Academy of Environmental Sciences, State Environmental Protection Key Laboratory of Simulation and Control of Groundwater Pollution, Beijing 100012, China | | | JIA Yong-feng | Chinese Research Academy of Environmental Sciences, State Environmental Protection Key Laboratory of Simulation and Control of Groundwater Pollution, Beijing 100012, China | | | JIANG Yong-hai | Chinese Research Academy of Environmental Sciences, State Environmental Protection Key Laboratory of Simulation and Control of Groundwater Pollution, Beijing 100012, China | jyhai203@126.com |
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| Abstract: |
| An understanding of the denitrification process of nitrate in groundwater is vital because it can dissipate groundwater nitrate pollution. In this study, in order to the determine the intensity and factors affecting denitrification in aquifers, an integrated analysis method was adopted to summarize the ranges in denitrification intensities in different aquifer mediums. Then, the vertical distribution of denitrification intensities was revealed along the sampling depth. Finally, the factors affecting denitrification intensity were determined in the different grades of sampling depths and DO concentrations. Additionally, the uncertainty of the statistical results of denitrification intensities was analyzed. The results showed that the denitrification intensities of nitrate in the groundwater generally ranged between 10-1~102 μg·kg-1·d-1, and could reach 103 μg·kg-1·d-1 in the sand and gravel mediums. No significant correlation between the pore size and denitrification intensity was found. The denitrification intensities increased gradually and then decreased significantly along the sampling depth from the ground surface. The distinction of the depths that corresponded to the peak value of denitrification intensity was significant at different sites. The denitrification intensities in the shallow and deep aquifers were affected by organic carbon and Eh, respectively. When the DO concentrations ranged between 0.2~2.0 mg·L-1, the denitrification intensity had a non-significant negative relationship with the sampling depth, groundwater depth, NO3--N concentration, and Eh. When the DO concentration ranged between 2~6 mg·L-1, it was negatively correlated with sampling depth and positively correlated with temperature. When the DO concentration was greater than 6 mg·L-1, it was negatively correlated with Eh. The uncertainty of the statistical results of denitrification intensity mainly resulted from the experimental methods, calculation methods, and statistical processes. Our results could supply a theoretical basis for the fate of nitrate in aquifers and for the prevention, control, and restoration of groundwater nitrate pollution. |
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