Dual roles of dissolved organic nitrogen in groundwater nitrogen cycling: Nitrate precursor and denitrification promoter

Liu, Yang; Xin, Jia; Wei, Yuan; Yang, Zhixiang; Liu, Shixuan; Zheng, Xilai

doi:10.1016/j.scitotenv.2021.151375

Cited by 27 publications

(3 citation statements)

References 56 publications

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“…The experimental setup is shown in Figure 1. We used five extractants (KCl, 1 M; KCl, 2 M; K 2 SO 4 , 0.5 M; CaCl 2 , 0.01 M; Ultrapure water) that are generally used in soil N‐cycling studies (Inselsbacher, 2014; Kachurina et al, 2000; Liu et al, 2021). Additionally, we selected four durations (15, 30, 60, and 120 min), four solution volume‐to‐soil weight ratios (2:1, 5:1, 10:1, and 15:1), and three frequencies (1–3, times of extraction).…”

Section: Methodsmentioning

confidence: 99%

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Improvement of dissolved organic nitrogen extraction accuracy in unsaturated zones

Liu

Yang

Liu

et al. 2022

Hydrological Processes

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Dissolved organic nitrogen (DON) plays a crucial role in biogeochemical processes of nitrogen (N) and has become a non-negligible source of increasing groundwater nitrogen contamination. Therefore, the extraction accuracy of DON in unsaturated zones is essential for sound understanding of N transport, transformation behaviour and contamination processes. However, there is no uniform extraction standard for measuring DON content in the unsaturated zone. Moreover, the influences of various extraction conditions on the DON measurement are not clear. Hereby, we are the first to address the issues associated with all the extraction indicators (extractant types and concentrations, extraction duration, frequency, and solution volume-to-soil weight ratio) for the DON extraction accuracy in unsaturated zones, and present a comprehensive influence analyses. Our results revealed that extraction conditions could significantly influence the extraction accuracy of DON and that the principal impact factor was the concentration of the extractant. We also found that the widely used previous extraction approaches (high-salinity extraction method) would induce high uncertainty in measuring the DON content in unsaturated zones of different areas. Furthermore, the opposing influences from the ions of extractants can seriously affect the assessment of DON content and hinder comparability even using the same extraction method, which could severely affect the assessment of the DON content in unsaturated zones. Such uncertainty in measurements will eventually influence the observation and evaluation of groundwater nitrogen contamination. Our results demonstrated that the use of the former DON extraction method without considering the research purposes and the specific study areas would lead to a strong bias. Based on detailed response surface analysis, we provide a comprehensive analysis related to the accuracy of DON extraction, which is conducive to improving the extraction accuracy of nitrogen research in global groundwater hydrological processes in the future.

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Section: Methodsmentioning

confidence: 99%

“…The detection method was the Nesslerization colorimetric method for NH 4 + -N, spectrophotometric method involving diazo-coupling for (Inselsbacher, 2014;Kachurina et al, 2000;Liu et al, 2021).…”

Section: Sampling and Measurement Of Soil Physicochemical Propertiesmentioning

confidence: 99%

Improvement of dissolved organic nitrogen extraction accuracy in unsaturated zones

Liu

Yang

Liu

et al. 2022

Hydrological Processes

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“…DON in groundwater has the potential to be converted to nitrogenous disinfection byproducts that can pose cancer risks to human after drinking water treatment . Additionally, the mineralization of certain DONs (such as urea) may aggravate NO 3 – -N contamination of groundwater . Therefore, understanding the geochemical process (especially adsorption) of DON in groundwater is important for assessing the potential risks and for developing effective remediation strategies.…”

Section: Introductionmentioning

confidence: 99%

Adsorption Characteristics of Dissolved Organic Nitrogen on Aquifer Porous Media: The Role of Media Particle Size

Liu,

Zheng,

Guo

et al. 2024

ACS EST Water

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The adsorption of dissolved organic nitrogen (DON) bears the potential to exert a profound influence on the migration ability and groundwater quality. However, the effects of aquifer porous media, characterized by diverse particle dimensions, on the capacity of DON adsorption remain uncertain. The present study clarifies the characteristics and intricate machinations of DON adsorption on porous media with different particle sizes. Our findings suggest that DON adsorption has the potential to achieve immediate equilibrium, and the rate of kinetic adsorption increases as the particle size decreases. Fine sand exhibits a higher adsorption rate (0.030−0.058 kg (mg h) −1 ) and a greater adsorption capacity (137.73−486.67 mg N kg −1 ). Besides, adsorption capacities of amino acids and proteins on porous media are higher, caused by the forces of hydrogen bonding and ester groups. Urea's adsorption capacity exhibits the lowest values, and the main adsorption mechanism is the reactivity of carbonyl groups with porous media. The impact of environmental factors (DOM, metal oxides, and salinity) on adsorption pattern is mainly linked to DON types while being slightly affected by variations in the particle size of porous media. The study highlights that the capacity of DON adsorption on porous media is substantial enough to warrant consideration in site characterization and design of remediation strategies.

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Spatial and Temporal Patterns of Nitrogen Mobilization in Residential Lawns

et al. 2023

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Dual roles of dissolved organic nitrogen in groundwater nitrogen cycling: Nitrate precursor and denitrification promoter

Cited by 27 publications

References 56 publications

Improvement of dissolved organic nitrogen extraction accuracy in unsaturated zones

Improvement of dissolved organic nitrogen extraction accuracy in unsaturated zones

Adsorption Characteristics of Dissolved Organic Nitrogen on Aquifer Porous Media: The Role of Media Particle Size

Spatial and Temporal Patterns of Nitrogen Mobilization in Residential Lawns

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