Membrane inlet mass spectrometry method (REOX/MIMS) to measure 15N-nitrate in isotope-enrichment experiments

Lin, Xianbiao; Lu, Kaijun; Hardison, Amber K.; Liu, Zhanfei; Xu, Xin; Gao, Dengzhou; Gong, Jun; Gardner, Wayne S.

doi:10.1016/j.ecolind.2021.107639

Cited by 111 publications

(20 citation statements)

References 60 publications

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“…The 10 ml water sample with impurity filtered was placed in a 50 ml centrifuge tube to dissolve particulate heavy metal by adding 10 ml nitric acid, which was digested at 80 °C for 6 hours on an electric heating plate (DB-2AB, Shanghai Lichen Instrument Technology Co., Ltd, China). It was to be measured after cooled (Lin et al 2021).…”

Section: Sample Treatment and Determination Of Heavy Metalsmentioning

confidence: 99%

Distribution feature of heavy metals in the system of sediment-submerged plant-water in Xuanwu Lake

Liu

Chun

Zhang³

et al. 2022

Water Supply

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In view of the distribution of heavy metal pollutants in Xuanwu Lake after the comprehensive dredging, contents of Cr, Mn, Ni, Cu, Zn, Cd and Pb in 4 dominant submerged plants and their corresponding sediments in the lake and in surface water were determined, so as to reveal the pollution and distribution of the heavy metals in the system of sediments-submerged plants-water in Xuanwu Lake. Results showed that the average mass concentration of Cr and Ni in the surface water of Xuanwu Lake exceeded the national standard Grade II of the quality of surface water which were 1.79 and 1.56 times, respectively; The contents of Cd and Pd in sediments was respectively 3.31 and 1.17 times of the background value of Nanjing soil, and the North Lake, the contents of Mn, Ni, Zn, Cd and Pd in surface water and Cr, Ni, Zn, Cd and Pd in sediments were higher than other lake areas. The average value Igeo of each element was ranked by size as Cd > Pb > Zn > Cr > Cu > Mn > Ni, except that Cd was the slight pollution (Igeo value is 0.20–0.47), the other heavy metal elements were at a clean level. In the four submerged plants, Mn was significantly positively correlated with Ni, Cu, Zn and Cd (p < 0.01). Ni was significantly positively correlated with Cu, Zn and Cd. Cr in the submerged plants was significantly positively correlated with Cr and Ni in the surface water; The contents of Cd and Pd were significantly positively correlated with Pd and Cu in the surface water (p < 0.05).

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Section: Sample Treatment and Determination Of Heavy Metalsmentioning

confidence: 99%

Distribution feature of heavy metals in the system of sediment-submerged plant-water in Xuanwu Lake

Liu

Chun

Zhang³

et al. 2022

Water Supply

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“…Lin et al (2017) and Hou et al (2018) further applied OX/ MIMS method successfully to the analyses of N mineralization and NH 4 + immobilization as well as N fixation rates in aquatic ecosystems. Recently, a new approach extended the existing OX/MIMS to quantify 15 NO 3 À concentration and assess the nitrification and NO 3 À immobilization process rates (Lin et al, 2021). Overall, key N transformation processes in aquatic environments can be well quantified using MIMS via incubation experiments combined with 15 N isotope-tracing techniques (Figure 2).…”

Section: Techniques and Approaches For Determination Of N Cycling Pro...mentioning

confidence: 99%

Nitrogen cycling in aquatic environments of China: Progress and future challenges

Hou

Gao

Zheng

et al. 2022

Progress in Physical Geography: Earth and Environment

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Aquatic environments are hot spots of nitrogen (N) cycling and nitrous oxide (N2O) emission. Understanding key N biogeochemical processes and N2O dynamics is critical for uncovering the responses of aquatic environments to human activities. In this study, we summarized the development of techniques and approaches for determination of N cycling processes and N2O sources in aquatic environments of China. We also reviewed the main N transformation processes and associated biogeochemical controls in aquatic environments of China (e.g., constructed wetlands, paddy fields, lakes, rivers, aquaculture ponds, and estuaries and coasts). In addition, we further synthesized N2O dynamics in these aquatic environments. The results suggested that N cycling processes have been greatly concerned in various aquatic environments of China, whereas more comprehensive analyses of N cycling processes are still sparse for projecting N fates and dynamics in response to changing environments, largely limiting the implementation of N management strategy of China. Aquatic environments of China may be the important sources of atmospheric N2O, but the production and consumption processes of N2O need to be further studied for effective greenhouse gas mitigation. We also argued that it is urgently necessary to incorporate microbial traits into biogeochemical ecosystem modeling to improve the estimation reliability of N cycling and N2O dynamics. This review highlights the importance of N cycling and N2O dynamics, as well as associated environmental implications, and presents the directions of future research on N cycling in aquatic environments of China.

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“…Overall, the COD concentration in the effluent of the IC reactor was slightly lower than that of the EGSB reactor, indicating that the COD removal rate of the IC reactor was higher than that of the EGSB reactor and the load-bearing performance of the IC reactor was slightly better than the EGSB reactor. 2− is an important factor affecting the anaerobic digestion process [17][18][19][20][21][22] and plays a decisive role in the substrate competition between sulfate-reducing bacteria (SRB) and methane-producing bacteria (MPB) in the system. Moreover, the sulfate reduction product, sulfide, has a toxic effect on MPB, inhibits the normal metabolism of MPB, and reduces the removal efficiency of COD.…”

Section: Influence Of Organic Load On Cod Removal Rate and The Compar...mentioning

confidence: 99%

Performance Comparison of EGSB and IC Reactors for Treating High-Salt Fatty Acid Organic Production Wastewater

Jeong

Lai

et al. 2022

Processes

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This study used the EGSB and IC reactors to treat the high-salt and high-concentration organic wastewater (high-salt fatty acid production wastewater) and compared their performances The experimental results showed that the optimal influent water quality thresholds for both bioreactors to treat this wastewater were a COD concentration of 18,000 mg/L and a sulfate ion concentration of about 8000 mg/L. The reactor operated well when C/S was greater than 2.8. In addition, the value of C/S should not be less than 1.5. This is due to that under this condition, the sulfate reduction process has a significant impact on the removal of COD, and MPB may be inhibited by sulfides. The organic load OLR should not be greater than 10 kgCOD/(m3·d). It was also found that the start-up time of the IC reactor with external circulation was slightly shorter, and the COD removal effect, gas production rate, and load tolerance were slightly better than those of the EGSB reactor, the best reflux ratio of the two reactors was 6:1. The appropriate rising flow rate was 0.4 m/h.

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Membrane inlet mass spectrometry method (REOX/MIMS) to measure 15N-nitrate in isotope-enrichment experiments

Cited by 111 publications

References 60 publications

Distribution feature of heavy metals in the system of sediment-submerged plant-water in Xuanwu Lake

Distribution feature of heavy metals in the system of sediment-submerged plant-water in Xuanwu Lake

Nitrogen cycling in aquatic environments of China: Progress and future challenges

Performance Comparison of EGSB and IC Reactors for Treating High-Salt Fatty Acid Organic Production Wastewater

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