Phosphorus in Interstitial Water Induced by Redox Potential in Sediment of Dianchi Lake, China

Li, Qingman; Wen, Zhang; Wang, Xingxiang; Zhou, Yiyong; Yang, Han–Soeb; Ji, Guoliang

doi:10.1016/s1002-0160(07)60089-7

Cited by 47 publications

(21 citation statements)

References 32 publications

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“…The initial cell densities of M. aeruginosa were all 5 Â 10 6 cells Á ml À1 in cultures. The phosphate-limited and phosphate-rich levels in this study are similar to the phosphate conditions found in Dianchi lakes [23].…”

Section: Arsenate Treatment Of M Aeruginosa Culturessupporting

confidence: 85%

Arsenic speciation and effect of arsenate inhibition in a Microcystis aeruginosa culture medium under different phosphate regimes

Guo

Gong

Wang

et al. 2011

Enviro Toxic and Chemistry

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Abstract-To assess the ecological impact of arsenic pollution during cyanobacterial blooms, As speciation and cyanobacterial growth in phosphate-modified Microcystis aeruginosa cultures treated with arsenate were investigated under laboratory conditions. Marked growth inhibition was observed when arsenate was added. The inhibition effect of 1 mM arsenate was lower than that of 10 mM arsenate. Increasing phosphate supply (0-175 mM) in the medium decreased the inhibition of As. In the medium, arsenate, arsenite, and dimethylarsenicals (DMA) occurred under phosphate-deprivation (0 mM) and phosphate-excess (175 mM) conditions. However, only arsenate and DMA were detected under phosphate-limited (1 mM) and phosphate-rich (10 mM) conditions. Moreover, arsenite and DMA concentrations had significantly positive correlation with the biomass production of M. aeruginosa in the existence of phosphate. Arsenic speciation was more significantly affected by phosphate levels than arsenate concentrations. Recovery of total As content in M. aeruginosa culture medium increased with the increasing phosphate supply. The duration of arsenate contamination in the culture of M. aeruginosa had no influence on the variation of As species but affected the concentration of them in the medium under the phosphateexcess condition. This demonstrated that the effect of M. aeruginosa on As speciation was not related to the duration of As contamination under the phosphate-excess condition. Environ.

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Section: Arsenate Treatment Of M Aeruginosa Culturessupporting

confidence: 85%

Arsenic speciation and effect of arsenate inhibition in a Microcystis aeruginosa culture medium under different phosphate regimes

Guo

Gong

Wang

et al. 2011

Enviro Toxic and Chemistry

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“…We found that %DO levels were lower during summer low flows and were positively correlated with stream flow in suburban in-line SCMs (Figure 4d-f), supporting coupling between anaerobic conditions and stream flow. Meanwhile, previous studies have also shown that SRP adsorbed on Fe or Mn hydroxides was released when Fe or Mn hydroxides were reduced under anoxic conditions, a process influenced by redox potential and water temperature [20,29,44]. Potentially, SRP can be mobilized from sediments of suburban and urban SCMs during low flows due to Fe/Mn hydroxides reduction under anaerobic conditions.…”

Section: Possible Biogeochemical Controls Pp Retention In Scmsmentioning

confidence: 97%

Phosphorus Retention in Stormwater Control Structures across Streamflow in Urban and Suburban Watersheds

Duan

Johnson

Mayer

et al. 2016

Water

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Abstract:Recent studies have shown that stormwater control measures (SCMs) are less effective at retaining phosphorus (P) than nitrogen. We compared P retention between two urban/suburban SCMs and their adjacent free-flowing stream reaches at the Baltimore Long-Term Ecological Study (LTER) site, and examined changes in P retention in SCMs across flow conditions. Results show that, when compared with free-flowing stream reaches, the SCMs had significantly lower dissolved oxygen (%DO) and higher P concentrations, as well as lower mean areal retention rates and retention efficiencies of particulate P (PP). In all the SCMs, concentrations of total dissolved phosphorus (TDP) consistently exhibited inverse correlations with %DO that was lower during summer base flows. Particulate phosphorus (PP) concentrations peaked during spring high flow period in both streams and in-line pond/SCMs, but they were also higher during summer base flows in suburban/urban SCMs. Meanwhile, PP areal retention rates and retention efficiencies of the SCMs changed from positive (indicating retention) during high flows to negative (indicating release) during low flows, while such changes across flow were not observed in free-flowing stream reaches. We attribute the changing roles of SCMs from a PP sink to a PP source to changes in SCM hydrologic mass balances, physical sedimentation and biogeochemical mobilization across flows. This study demonstrates that in suburban/urban SCMs, P retained during high flow events can be released during low flows. Cultivation of macrophytes and/or frequent sediment dredging may provide potential solutions to retaining both P and nitrogen in urban SCMs.

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“…Therefore, it is very likely that canonical anoxic denitrification is the main source of N incorporated into the N 2 O produced during the incubations. Rapid oxygen consumption supported by high rates of organic matter input to the sediments can reduce the oxygen penetration depth into the sediments, producing conditions favorable to denitrification close to the sediment/water interface (Li et al, 2007). It is still not clear, however, whether canonical denitrifiers carry out all of the steps involved in reducing NO (Fig.…”

Section: Water Column Characteristicsmentioning

confidence: 99%

Year-round N<sub>2</sub>O production by benthic NO<sub>x</sub> reduction in a monomictic south-alpine lake

et al. 2013

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Abstract. Nitrous oxide (N 2 O) is a potent greenhouse gas, generated through microbial nitrogen (N) turnover processes, such as nitrification, nitrifier denitrification, and denitrification. Previous studies quantifying natural sources have mainly focused on soils and the ocean, but the potential role of terrestrial water bodies in the global N 2 O budget has been widely neglected. Furthermore, the biogeochemical controls on the production rates and the microbial pathways that produce benthic N 2 O in lakes are essentially unknown. In this study, benthic N 2 O fluxes and the contributions of the microbial pathways that produce N 2 O were assessed using 15 N label flow-through sediment incubations in the eutrophic, monomictic south basin of Lake Lugano in Switzerland. The sediments were a significant source of N 2 O throughout the year, with production rates ranging between 140 and 2605 nmol N 2 O h −1 m −2 , and the highest observed rates coinciding with periods of water column stratification and stably anoxic conditions in the overlying bottom water. Nitrate (NO − 3 ) reduction via denitrification was found to be the major N 2 O production pathway in the sediments under both oxygen-depleted and oxygen-replete conditions in the overlying water, while ammonium oxidation did not contribute significantly to the benthic N 2 O flux. A marked portion (up to 15 %) of the total NO − 3 consumed by denitrification was reduced only to N 2 O, without complete denitrification to N 2 . These fluxes were highest when the bottom water had stabilized to a low-oxygen state, in contrast with the notion that stable anoxia is particularly conducive to complete denitrification without accumulation of N 2 O. This study provides evidence that lake sediments are a significant source of N 2 O to the overlying water and may produce large N 2 O fluxes to the atmosphere during seasonal mixing events.

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Phosphorus in Interstitial Water Induced by Redox Potential in Sediment of Dianchi Lake, China

Cited by 47 publications

References 32 publications

Arsenic speciation and effect of arsenate inhibition in a Microcystis aeruginosa culture medium under different phosphate regimes

Arsenic speciation and effect of arsenate inhibition in a Microcystis aeruginosa culture medium under different phosphate regimes

Phosphorus Retention in Stormwater Control Structures across Streamflow in Urban and Suburban Watersheds

Year-round N<sub>2</sub>O production by benthic NO<sub>x</sub> reduction in a monomictic south-alpine lake

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Phosphorus in Interstitial Water Induced by Redox Potential in Sediment of Dianchi Lake, China

Cited by 47 publications

References 32 publications

Arsenic speciation and effect of arsenate inhibition in a Microcystis aeruginosa culture medium under different phosphate regimes

Arsenic speciation and effect of arsenate inhibition in a Microcystis aeruginosa culture medium under different phosphate regimes

Phosphorus Retention in Stormwater Control Structures across Streamflow in Urban and Suburban Watersheds

Year-round N&lt;sub&gt;2&lt;/sub&gt;O production by benthic NO&lt;sub&gt;x&lt;/sub&gt; reduction in a monomictic south-alpine lake

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Year-round N<sub>2</sub>O production by benthic NO<sub>x</sub> reduction in a monomictic south-alpine lake