Efficacy of H2O2 on the removal kinetics of H2S in saltwater aquaculture systems, and the role of O2 and NO3−

Bergstedt, Julie Hansen; Skov, Peter Vilhelm; Letelier-Gordo, Carlos Octavio

doi:10.1016/j.watres.2022.118892

Cited by 19 publications

(8 citation statements)

References 32 publications

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“…In addition, the amount of O 2 •– produced was quantified using nitroblue tetrazolium chloride (NBT) as a probe, which determined that 22.0 μmol/L O 2 •– was accumulated in the CrN 4 /MXene system, providing solid evidence on the desorption of Cr–O 2 •– followed by the formation of free • OOH (eq ). To further determine the primary intermediate of the 1 O 2 electrosynthesis, the respective effects of superoxide dismutase (SOD, the scavenger for • OOH), furfuryl alcohol (FFA, the scavenger for 1 O 2 ), and catalase (the scavenger for H 2 O 2 ) , on the EPR signal and SMX degradation kinetics were examined. The results are depicted in Figure f and Figure S17 showed that the presence of SOD and FFA as scavengers significantly decreased the peak intensity of 1 O 2 -TEMP adduct and the SMX degradation kinetics (0.018 and 0.003 min –1 ), highlighting that • OOH was the most prominent intermediate in the CrN 4 /MXene electrocatalytic system (eq ).…”

Section: Resultsmentioning

confidence: 99%

A General Strategy to Synthesize Fluidic Single Atom Electrodes for Selective Reactive Oxygen Species Production

et al. 2023

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Fine-tuning the geometric and electronic structure of catalytic metal centers via N-coordination engineering offers an effective design for the electrocatalytic transformation of O 2 to singlet oxygen ( 1 O 2 ). Herein, we develop a general coordination modulation strategy to synthesize fluidic single-atom electrodes for selective electrocatalytic activation of O 2 to 1 O 2 . Using a single Cr atom system as an example, >98% 1 O 2 selectivity can be achieved from electrocatalytic O 2 activation due to the subtle engineering of Cr−N 4 sites. Both theoretical simulations and experimental results determined that "end-on" adsorption of O 2 onto the Cr−N 4 sites lowers the overall activation energy barrier of O 2 and promotes the breakage of Cr−OOH bonds to form • OOH intermediates. In addition, the flow-through configuration (k = 0.097 min −1 ) endowed convection-enhanced mass transport and improved charge transfer imparted by spatial confinement within the lamellar electrode structure compared to that of batch reactor (k = 0.019 min −1 ). In a practical demonstration, the Cr−N 4 / MXene electrocatalytic system exhibits a high selectivity toward electron-rich micropollutants (e.g., sulfamethoxazole, bisphenol A, and sulfadimidine). The flow-through design of the fluidic electrode achieves a synergy with the molecular microenvironment that enables selective electrocatalytic 1 O 2 generation, which could be used in numerous ways, including the treatment of environmental pollution.

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Section: Resultsmentioning

confidence: 99%

A General Strategy to Synthesize Fluidic Single Atom Electrodes for Selective Reactive Oxygen Species Production

et al. 2023

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“…DAQfactory controlled the H 2 S concentrations by an analog output signal to the peristaltic pump to turn on/off when concentrations deviated from the predefined levels. Continuous dosing of sulfide via the feedback system was chosen to minimize the decrease in sulfide concentrations caused by the oxidation of sulfide by O 2 (Bergstedt et al, 2022). The experiments were conducted in a temperature-controlled room, which kept the experimental setup at 14.0 ± 0.9 • C. To avoid visual disturbance of fish the main tank was partially shielded by non-transparent plastic.…”

Section: Experimental Designmentioning

confidence: 99%

“…Similar complications occur when providing only the concentration of the sulfide donors such as Na 2 S and NaHS. Due to the oxidation of sulfide by oxygen, the half-life of H 2 S in a solution is <3 h (Bergstedt et al, 2022). Therefore, if a continuous dosage of H 2 S in the system is not maintained, a mismatch between the actual experimental concentration and the theoretically intended concentration will occur.…”

Section: Tablementioning

confidence: 99%

“…The technology for monitoring H 2 S concentrations and H 2 S mitigation protocols to prevent a build-up of H 2 S should rely on sensor systems that provide quick feedback. The negative effects on fish exposed to high H 2 S concentrations are rapid, and actions in order to prevent casualties, such as the addition of oxidative agents, need to be taken fast to remove H 2 S from the system (Bergstedt et al, 2022).…”

Section: Response To Increasing H 2 Smentioning

confidence: 99%

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Acute hydrogen sulfide exposure in post-smolt Atlantic salmon (Salmo salar): Critical levels and recovery

Bergstedt

Skov

2023

Aquaculture

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“…High levels of H 2 S may affect the fish health and robustness and can result to mass mortalities in the worst case (Hjeltnes et al, 2017;Dalsgaard, 2019;Sommerset et al, 2020). Many research studies have been done to explain its formation in closed systems (Letelier-Gordo et al, 2020;Rojas-Tirado et al, 2021;Bergstedt et al, 2022), however, physiological and immunological studies designed to understand the mechanism of H 2 S in fish are rare.…”

Section: Introductionmentioning

confidence: 99%

Sulphide donors affect the expression of mucin and sulphide detoxification genes in the mucosal organs of Atlantic salmon (Salmo salar)

2022

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Hydrogen sulphide (H2S) is a gas that affects mucosal functions in mammals. However, its detrimental effects are less understood in fish despite being known to cause mass mortality. Here we used explant models to demonstrate the transcriptional responses of Atlantic salmon (Salmo salar) mucosa to the sulphide donor sodium hydrosulphide (NaHS). The study focused on two groups of genes: those encoding for sulphide detoxification and those for mucins. Moreover, we performed pharmacological studies by exposing the organ explants to mucus-interfering compounds and consequently exposed them to a sulphide donor. Exposure to NaHS significantly affected the expression of sulphide:quinone oxidoreductase (sqor1, sqor2) and mucin-encoding genes (muc5ac, muc5b). The general profile indicated that NaHS upregulated the expression of sulphide detoxification genes while a significant downregulation was observed with mucins. These expression profiles were seen in both organ explant models. Pharmacological stimulation and inhibition of mucus production used acetylcholine (ACh) and niflumic acid (NFA), respectively. This led to a significant regulation of the two groups of marker genes in the gills and olfactory rosette explants. Treatment of the mucosal organ explants with the mucus-interfering compounds showed that low dose NFA triggered more substantial changes while a dose-dependent response could not be established with ACh. Pharmacological interference demonstrated that mucins played a crucial role in mucosal protection against H2S toxicity. These results offer insights into how a sulphide donor interfered with mucosal responses of Atlantic salmon and are expected to contribute to our understanding of the least explored H2S-fish interactions—particularly at the mucosa.

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Efficacy of H2O2 on the removal kinetics of H2S in saltwater aquaculture systems, and the role of O2 and NO3−

Cited by 19 publications

References 32 publications

A General Strategy to Synthesize Fluidic Single Atom Electrodes for Selective Reactive Oxygen Species Production

A General Strategy to Synthesize Fluidic Single Atom Electrodes for Selective Reactive Oxygen Species Production

Acute hydrogen sulfide exposure in post-smolt Atlantic salmon (Salmo salar): Critical levels and recovery

Sulphide donors affect the expression of mucin and sulphide detoxification genes in the mucosal organs of Atlantic salmon (Salmo salar)

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