Source identification of particulate organic carbon using stable isotopes and n-alkanes: modeling and application

Meng, Lize; Zhao, Zhihui; Lu, Lingfeng; Zhou, Juan; Luo, Derong; Fan, Ruihua; Li, Shuaidong; Jiang, Quanliang; Huang, Tao; Yang, Hao; Huang, Changchun

doi:10.1016/j.watres.2021.117083

Cited by 36 publications

(11 citation statements)

References 71 publications

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“…The proportion of endogenous, autochthonous carbon strongly depends on location-based factors like nutrient availability or temperature, morphology of the surface water. However, studies investigating POM sources mostly only distinguish between endogenous POM and terrestrial POM, e.g., by stable C-N isotope analysis (Meng et al 2021 ). Typically, SAT infiltration basins and surface waters at BF sites are exposed to light and thus provoke algae growth.…”

Section: Introductionmentioning

confidence: 99%

Impacts of autochthonous particulate organic matter on redox-conditions and elimination of trace organic chemicals in managed aquifer recharge

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Ermisch

Ruhl

et al. 2023

Environ Sci Pollut Res

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Autochthonous carbon fixation by algae and subsequent deposition of particulate organic matter can have significant effects on redox conditions and elimination of trace organic chemicals (TOrCs) in managed aquifer recharge (MAR). This study investigated the impacts of different algae loadings (0–160 g/m2) and infiltration rates (0.06–0.37 m/d) on overall oxygen consumption and elimination of selected TOrCs (diclofenac, formylaminoantipyrine, gabapentin, and sulfamethoxazole) in adapted laboratory sand columns. An infiltration rate of 0.37 m/d in conjunction with an algae load of 80 g/m2 (dry weight) sustained oxic conditions in the sand bed and did not affect the degradation of TOrCs. Thus, the availability of easily degradable organic carbon from algae did not influence the removal of TOrCs at an influent concentration of 1 µg/L. In contrast, a lower infiltration rate of 0.20 m/d in combination with a higher algae loading of 160 g/m2 caused anoxic conditions for 30 days and significantly impeded the degradation of formylaminoantipyrine, gabapentin, sulfamethoxazole, and diclofenac. Especially the elimination of gabapentin did not fully recover within 130 days after pulsed algae deposition. Hence, measures like micro-sieving or nutrient control are required at bank filtration or soil aquifer treatment sites with low infiltration rates.

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Section: Introductionmentioning

confidence: 99%

Impacts of autochthonous particulate organic matter on redox-conditions and elimination of trace organic chemicals in managed aquifer recharge

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Ermisch

Ruhl

et al. 2023

Environ Sci Pollut Res

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“…A similar trend of δ 13 C POC with Chlorophyll-A concentrations and phytoplankton densities indicates that the cyanobacterial bloom event is the determining factor in the POC pool, whereas δ 13 C POC along the water column spanning approximately 1‰-2‰ implies less influence of sinking progress and sediment resuspension, both of which occur frequently in shallow lakes (Tang et al, 2020;Wang et al, 2022). Simultaneously, a significantly higher proportion of C 27 sterols among the C 27 -C 29 sterols than riverine samples also suggests the increasing zooplankton and an additional supply of cyanobacteria-derived OC within the lake, further supporting the notion that cyanobacteria contribute a large amount of labile OC to the total POC pool in Meiliang bay (Xu et al, 2019;Meng et al, 2021). However, during the decay season, terrestrial OC became the major source of POC in Meiliang Bay.…”

Section: Strong Seasonal Variations In Pocmentioning

confidence: 64%

“…The seasonal bloom and succession of phytoplankton in Meiliang Bay shape the POC pool, as evidenced by δ 13 C POC and biomarkers. In Meiliang Bay, the higher δ 13 C POC in the bloom season approached the cyanobacterial signal at −20.5‰ (Xu et al, 2020;Meng et al, 2021), suggesting the dominant cyanobacteria-derived OC input. A similar trend of δ 13 C POC with Chlorophyll-A concentrations and phytoplankton densities indicates that the cyanobacterial bloom event is the determining factor in the POC pool, whereas δ 13 C POC along the water column spanning approximately 1‰-2‰ implies less influence of sinking progress and sediment resuspension, both of which occur frequently in shallow lakes (Tang et al, 2020;Wang et al, 2022).…”

Section: Strong Seasonal Variations In Pocmentioning

confidence: 90%

Seasonal constraints on the burial of organic carbon in the eutrophic Lake Taihu

He²,

Jiali³

et al. 2023

Front. Earth Sci.

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Eutrophication alters the function of lake ecosystems through phytoplankton blooms and is a major contributor to organic carbon (OC) burial in lakes worldwide. Although Lake Taihu is notable for its severe eutrophication yet low OC burial, why cyanobacteria-derived OC is ineffectively buried in the lake is unknown. Because seasonal hydrological and ecological dynamics in eutrophic lacustrine ecosystems would significantly modify the preservation and degradation behaviors of OC, seasonal variations in paired particulate samples from both the water column and surface sediment are critical in evaluating cyanobacteria-derived OC burial. In this study, we present the steroid results of water and sediments collected from Meiliang Bay in Lake Taihu across cyanobacteria-bloom and decay seasons (from May 2018 to June 2019) to investigate constraints on the seasonal burial of autochthonous and allochthonous OC. The results indicate that cyanobacteria contribute a considerable amount of OC to the water body in the cyanobacterial bloom season, while terrestrial OC becomes the main contributor during the cyanobacterial decay season. Although OC degradation occurs throughout the water column, substantially more OC degradation was observed at the water-sediment interface. The extensive degradation of OC in the bloom season eventually reverses the seasonal distribution characteristics of particulate OC in the water column, leading to less accumulation of OC under the background of higher cyanobacteria-derived OC input. The combined effect of OC bioavailability, temperature, oxygen exposure, and more importantly microorganism activities, accounts for much higher OC degradation rates in the bloom season. Similar phenomena were observed in subtropical shallow lakes with high primary productivity, suggesting that eutrophication might have a limited influence on OC burial when compared to other factors related to OC degradation.

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“…The most commonly used acetylene inhibition technique is currently considered unsuitable for quantifying the denitri cation rates, mainly because of the catalytic decomposition of NO in the presence of acetylene and O 2 (Wu et al, 2019). Nitrogen isotopes have been widely used for understanding inorganic nitrogen sources, migration, and transformation in various environments ( (Bu et al, 2017;Jin et al, 2017;Meng et al, 2021). Natural abundance nitrogen (δ 15 (2018) analyzed δ 15 N and δ 18 O using a Finnigan MAT delta plus XL isotope ratio mass spectrometer at the Isotope Science Laboratory to assess denitri cation in a hyporheic zone.…”

Section: Introductionmentioning

confidence: 99%

Arrhenius equation construction and nitrate source identification of denitrification at the Lake Taihu sediment − water interface with 15 N isotope

Pang

et al. 2023

Environ Sci Pollut Res

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Total nitrogen in Taihu Lake, China has gradually decreased since 2015 while the total phosphorus concentration has exhibited an increasing trend, indicating an asynchronous change. The dominant nitrogen removal process in freshwater ecosystems is denitri cation which primarily occurs at the sediment-water interface. In this study, 15 N isotope incubation experiments were attempted to analyze the effect of water temperature on denitri cation, to construct the regional denitri cation Arrhenius equations considering water temperature, and to identify the nitrate source of denitri cation in Lake Taihu sediments. The results indicated that the potential N 2 production rates and denitri cation rates generally decreased in the west to east direction, which was signi cantly positively correlated with the nitrate concentration of overlying water by Pearson correlation coe cient analysis (P < 0.05). In addition, when the water temperature was lower than 30°C, the rates of the potential N 2 production and denitri cation were higher with an increase in water temperature, but when the water temperature was overhigh, denitri cation was inhibited. The ratio of the total denitri cation rate of nitrate from the water column in the sediment to the total denitri cation rate during the incubation experiment was above 0.5 at each sampling site. This indicated that the denitri cation in the Lake Taihu sediment primarily occurred at the expense of nitrate from the water column. The research results of Arrhenius equation construction and nitrate source identi cation of denitization can be applied to improve the accuracy of water quality model of Taihu Lake, which is of great signi cance to improve Taihu Lake water quality, and can act as a reference for the water environment treatment of other shallow eutrophic lakes in China and abroad.

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Source identification of particulate organic carbon using stable isotopes and n-alkanes: modeling and application

Cited by 36 publications

References 71 publications

Impacts of autochthonous particulate organic matter on redox-conditions and elimination of trace organic chemicals in managed aquifer recharge

Impacts of autochthonous particulate organic matter on redox-conditions and elimination of trace organic chemicals in managed aquifer recharge

Seasonal constraints on the burial of organic carbon in the eutrophic Lake Taihu

Arrhenius equation construction and nitrate source identification of denitrification at the Lake Taihu sediment − water interface with 15 N isotope

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