Flood-Pulse and Trophic Position Modulate Mercury Concentration in Fishes from an Amazon Floodplain Lake

Paiva, Thaís de Castro; Dary, Eurizângela Pereira; Pestana, Inácio Abreu; Amadio, Sidinéia; Malm, Olaf; Kasper, Daniele

doi:10.2139/ssrn.4111398

Cited by 2 publications

(2 citation statements)

References 22 publications

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“…Mercury (Hg) is a global pollutant known for its persistence and capacity to travel across the globe [1,2]. The methylation and subsequent bioaccumulation of mercury in the food chain result in the formation of methylmercury (MeHg), an extremely toxic variant of mercury [3][4][5]. Exposure to MeHg has detrimental effects, including a reduction in the intelligence quotient (IQ) of fetuses and the occurrence of fatal heart attacks.…”

Section: Introductionmentioning

confidence: 99%

Hg⁰ chemisorption of magnetic manganese cobalt nano ferrite from simulated flue gas

Zhou,

Lv,

Zhang

et al. 2024

Phys. Scr.

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Mercury (Hg) emissions from the flue gas of coal-fired power plants constituted the primary source of atmospheric mercury pollution, manifesting in three distinct forms: granular mercury, oxidized mercury, and elemental mercury. This pollution posed significant threats to the ecological environment. There was an urgent demand for a more effective and economically viable mercury removal technology.The magnetic Mn0.5Co0.5Fe2O4 nanoparticles were prepared via a rapid combustion process. Their capacities for mercury adsorption and regeneration were scrutinized through a fixed-bed experimental system. The outcomes revealed that Mn0.5Co0.5Fe2O4 nanoparticles, prepared at a calcination temperature of 400 °C with 20 mL of anhydrous ethanol, exhibited the most proficient adsorption of Hg0. Under these specific conditions, the average particle size of the Mn0.5Co0.5Fe2O4 nanoparticles was approximately 26.8 nm. These nanoparticles demonstrated a superior adsorption capacity of 9.48 μg·g-1 for Hg0 at an adsorption temperature of 30 °C under a space velocity of 2.4×104 h-1. Elevating the permeation temperature to 70 °C resulted in an impressive adsorption capacity for Hg0, reaching 560.59 μg·g-1.The Hg-TPD (Hg-Temperature Programmed Desorption) and XPS (X-ray photoelectron spectroscopy) analyses revealed the involvement of chemisorbed oxygen (Oads), Mn3+, and Fe3+ in the adsorbent, facilitating the oxidation of Hg0 and generating HgO on the adsorbent surface. Following six cycles of adsorption and desorption, the adsorption capacity of Mn0.5Co0.5Fe2O4 nanoparticles for Hg0 retained 71% of the first adsorption capacity, which indicated that magnetic Mn0.5Co0.5Fe2O4 nanoparticles held great promise as an adsorbent for mercury removal.

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Section: Introductionmentioning

confidence: 99%

Hg⁰ chemisorption of magnetic manganese cobalt nano ferrite from simulated flue gas

Zhou,

Lv,

Zhang

et al. 2024

Phys. Scr.

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“…Recently, the integrated use of δ 15 N and THg analyses in Amazonian studies to demonstrate mercury biomagni cation in aquatic ecosystems has highlighted the corroborative relationship between trophic level and mercury concentrations (Paiva et al 2022;Nyholt et al 2022;Marshall et al 2016). It has already been shown that food ecology can affect the transfer of mercury in freshwater turtles (Châteauvert et al 2015), which is also true of sh and other aquatic organisms.…”

Section: Introductionmentioning

confidence: 99%

Mercury biomagnification in the food chain of a piscivorous turtle species (Testudines: Chelidae: Chelus fimbriata) in the Central Amazon, Brazil

Cunha,

Forsberg,

Vogt

et al. 2023

Preprint

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Turtles are an excellent biological model for studies of heavy metal contamination due to their natural history and ecological attributes. Turtles have a large geographical distribution, occupy different aquatic habitats, and pertain to various trophic levels. The present study investigated mercury bioaccumulation in the carnivorous chelonian Chelus fimbriata (Matamata turtle) and Hg biomagnification in relation to its aquatic food chain in the middle Rio Negro, Amazonas, Brazil. Tissue samples of muscle, carapace (shell) and claws were collected from 26 C. fimbriata, and autotrophic energy sources found in the turtle’s aquatic habitat area. In addition, samples of dorsal muscle tissue were collected from 7 Cichla. The samples were collected in February-March of 2014 and analyzed for THg concentrations and carbon (δ13C) and nitrogen (δ15N) stable isotopes. The highest THg concentrations were found in claws (3780ng.g-1), carapace (3622ng.g-1) and muscle (403ng.g-1), which were found to be significantly different (F(2.73)=49.02 p<0.01). The average δ13C and δ15N values in Matamata samples were 11.9‰ and -31.7‰, respectively. The principal energy source sustaining the food chain of C. fimbriata was found to be plankton and periphyton, while δ15N values showed its trophic position to be 3 levels above the autotrophic energy sources. There was a positive correlation between THg concentrations and turtle size, while a significant relationship was found between THg and δ15N, showing strong biomagnification in the food chain of C. fimbriata y=0.13x+0.97; r²=0.31). However, total mercury concentrations found in Matamata turtles were below the consumption threshold indicated by the WHO and Brazilian Health Ministry.

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Flood-Pulse and Trophic Position Modulate Mercury Concentration in Fishes from an Amazon Floodplain Lake

Cited by 2 publications

References 22 publications

Hg⁰ chemisorption of magnetic manganese cobalt nano ferrite from simulated flue gas

Hg⁰ chemisorption of magnetic manganese cobalt nano ferrite from simulated flue gas

Mercury biomagnification in the food chain of a piscivorous turtle species (Testudines: Chelidae: Chelus fimbriata) in the Central Amazon, Brazil

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Flood-Pulse and Trophic Position Modulate Mercury Concentration in Fishes from an Amazon Floodplain Lake

Cited by 2 publications

References 22 publications

Hg0 chemisorption of magnetic manganese cobalt nano ferrite from simulated flue gas

Hg0 chemisorption of magnetic manganese cobalt nano ferrite from simulated flue gas

Mercury biomagnification in the food chain of a piscivorous turtle species (Testudines: Chelidae: Chelus fimbriata) in the Central Amazon, Brazil

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Hg⁰ chemisorption of magnetic manganese cobalt nano ferrite from simulated flue gas

Hg⁰ chemisorption of magnetic manganese cobalt nano ferrite from simulated flue gas