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Bioaccumulation

About: Bioaccumulation is a research topic. Over the lifetime, 7112 publications have been published within this topic receiving 208953 citations. The topic is also known as: bioakumulace.


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Journal ArticleDOI
TL;DR: This investigation indicated that fish products in Taihu Lake were still safe for human consumption, but the amount consumed should be controlled under the Chinese Food Health Criterion to avoid excessive intake of Zn.
Abstract: The Cr, Zn, Cu, Cd, Pb contents were determined in Cyprinus carpio Linnaeus, Carassius auratus Linnaeus, Hypophthalmichthys molitrix and Aristichthys nobilis, which were caught from Meiliang Bay, Taihu Lake, a large, shallow and eutrophic lake of China. The results showed that: (1) the Cr, Cu, Pb, Cd contents in the edible parts of the four fish species were much lower than Chinese Food Health Criterion (1994), but the Zn contents were higher than the Criterion; (2) Cd contents were the highest in the liver of fish, Pb contents were almost the same in all organs of fish, Cr contents mainly enriched in the skin and gonads, Zn contents were the highest in the gonad (female), and Cu contents were the highest in the liver; (3) the total metal accumulation was the greatest in the liver and the lowest in the muscle. The total metal accumulation was the highest in C. auratus L. This investigation indicated that fish products in Taihu Lake were still safe for human consumption, but the amount consumed should be controlled under the Chinese Food Health Criterion to avoid excessive intake of Zn.

207 citations

Journal ArticleDOI
TL;DR: Much of the MeHg in higher trophic levels of coastal marine ecosystems, including fishes destined for human consumption, may be attributed to net sedimentary production and dietary bioaccumulation.
Abstract: Humans are exposed to methylmercury (MeHg) principally by consumption of marine fish. The coastal zone supports the majority of marine fish production, and may therefore be an important source of MeHg to humans; however, little is known about the bioaccumulation of MeHg in near-shore marine ecosystems. We examined MeHg in microseston, zooplankton, a decapod crustacean, and four representative species of finfish that differ in trophic status and/or prey selection in Long Island Sound (LIS), a large coastal embayment in the northeastern United States. MeHg biomagnifies in LIS; levels in microseston were 104.2 greater than those in water and 2.3-fold less than zooplankton. MeHg concentrations were related positively to fish length for each species, but often varied considerably among larger individuals. This may be due to differences in the past dietary MeHg exposure of these fish, some of which are migratory. Sedimentary production and mobilization can account for most of the MeHg in microseston of LIS, and by extension, other near-shore locations. Hence, much of the MeHg in higher trophic levels of coastal marine ecosystems, including fishes destined for human consumption, may be attributed to net sedimentary production and dietary bioaccumulation.

207 citations

Journal ArticleDOI
TL;DR: Exposure to mercury induced oxidative damage, increasing the lipid peroxidation and protein carbonyl content in all tissues, and Mercury accumulated significantly in all the fish tissue.
Abstract: Alterations in the antioxidant cellular system have often been proposed as biomarkers of pollutant-mediated toxicity. This study evaluated the effects of mercury on oxidative stress biomarkers and bioaccumulation in the liver, gills, white muscle and heart of the freshwater fish matrinxa, Brycon amazonicus, exposed to a nominal and sub-lethal concentration (~20% of 96 h-LC50) of 0.15 mg L−1 of mercury chloride (HgCl2) for 96 h in a static system. Increases in superoxide dismutase, catalase, glutathione peroxidase (GPx), glutathione S-transferase (GST) and glutathione reductase (GR) were observed in all tissues after HgCl2 exposure, except for white muscle GR activity and hepatic GPx. In the liver and gills, the exposure to HgCl2 also induced significant increases in reduced glutathione (GSH). Conversely, exposure to HgCl2 caused a significant decrease in the GSH levels and an increase in the oxidized glutathione (GSSG) content in the white muscle, while both GSH and GSSG levels increased significantly in the heart muscle. Metallothionein concentrations were significantly high after HgCl2 exposure in the liver, gills and heart, but remained at control values in the white muscle. HgCl2 exposure induced oxidative damage, increasing the lipid peroxidation and protein carbonyl content in all tissues. Mercury accumulated significantly in all the fish tissue. The pattern of accumulation follows the order gills > liver ≫ heart > white muscle. In conclusion, these data suggest that oxidative stress in response to inorganic mercury exposure could be the main pathway of toxicity induced by this metal in fish.

207 citations

Journal ArticleDOI
TL;DR: Results imply that PFCs are mainly present in water, which is important for PFC fate modeling and risk assessment.
Abstract: The distribution of 15 perfluorinated compounds (PFCs) among eel (Anguilla anguilla), sediment, and water was investigated for 21 locations in The Netherlands. Furthermore, for perfluorooctanesulfonate (PFOS), a 30 year time series was measured for three locations using historical eel samples. These historical samples revealed concentrations increasing by a factor of 2-4 until the mid-1990s, followed by a return to the initial levels. In the samples described here, PFOS dominated aqueous concentrations, ranging from 4.7 to 32 ng/L in water, from 0.5 to 8.7 ng/g in sediment, and from 7 to 58 ng/g in eel filet. Field-based sediment water distribution coefficients (K(D)) were calculated and corrected for organic carbon content (K(OC)), which reduced variability among samples. Log K(OC) ranges were 2.6-3.7 for the C7-C9 carboxylic acids and 2.2-3.2 for the C4-C8 sulfonates. Bioaccumulation factors (log BAFs) for eel ranged from 1.09-3.26 for the C7-C9 carboxylic acids to 1.4-3.3 for the C4-C8 sulfonates. Perfluoroalkyl chain length correlated well with both sorption and bioaccumulation factors. Magnitudes and trends in K(D) or BAF appeared to agree well with previously published laboratory data. Results imply that PFCs are mainly present in water, which is important for PFC fate modeling and risk assessment.

206 citations

01 Jan 2004
TL;DR: In this article, a review of the current state of knowledge regarding mechanisms and models of intestinal absorption and biomagnification of organic chemicals in organisms of aquatic and terrestrial food chains is presented.
Abstract: Methods for the regulatory assessment of the bioaccumulation potential of organic chemicals are founded on empirical measurements and mechanistic models of dietary absorption and biomagnification. This study includes a review of the current state of knowledge regarding mechanisms and models of intestinal absorption and biomagnification of organic chemicals in organisms of aquatic and terrestrial food chains and also includes a discussion of the implications of these models for assessing the bioac- cumulation potential of organic chemicals. Four mechanistic models, including biomass conversion, digestion or gastrointestinal magnification, micelle-mediated diffusion, and fat-flush diffusion, are evaluated. The models contain many similarities and represent an evolution in understanding of chemical bioaccumulation processes. An important difference between the biomagnification models is whether intestinal absorption of an ingested contaminant occurs solely via passive molecular diffusion through serial resistances or via facilitated diffusion that incorporates an additional advective transport mechanism in parallel (i.e., molecular ferrying within gastrointestinal micelles). This difference has an effect on the selection of physicochemical properties that best anticipate the bioaccumulative potential of commercial chemicals in aquatic and terrestrial food chains. Current regulatory initiatives utilizing KOW threshold criteria to assess chemical bioaccumulation potential are shown to be unable to identify certain bioaccumulative substances in air-breathing animals. We urge further research on dietary absorption and biomagnification of organic chemicals to develop better models for assessing the bioaccumulative nature of organic chemicals.

206 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
2023949
20222,090
2021463
2020445
2019416
2018415