Mercury in alpine fish from four rivers in the Tibetan Plateau

Shao, Jian; Shi, Jianbo; Bu, Duo; Liu, Chengbin; Gao, Yan; Fu, Jianjie; Yang, Ruiqiang; Jiang, Guibin

doi:10.1016/j.jes.2015.09.009

Cited by 37 publications

(9 citation statements)

References 44 publications

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“…Trace elements are generally non-biodegradable in natural environments with low concentrations and some of them are essential micro-nutrients (Milićević et al, 2017). Elevated concentrations of trace elements can cause serious environmental problems that not only threaten air, aquatic and soil ecosystems, but also cause food chain accumulation (Cong et al, 2010;Shao et al, 2016). Both natural and anthropogenic factors affect the distribution of trace elements and anthropogenic source is usually a main contributor (Lee et al, 2011).…”

Section: Introductionmentioning

confidence: 99%

Distribution, pollution, bioaccumulation, and ecological risks of trace elements in soils of the northeastern Qinghai-Tibet Plateau

Lü

et al. 2018

Ecotoxicology and Environmental Safety

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Environmental quality of the northeastern Qinghai-Tibet Plateau has attracted more attention due to increasing anthropogenic disturbance. Therefore, this study investigated the distribution, pollution, ecological risks, and bioaccumulation of 12 target heavy metals and 16 rare earth elements (REEs) in soils of this area. The average concentrations of target trace elements in soils ranged from 0.16 (Hg) to 500.46 (Cr) mg/kg. Pb caused more serious pollution than the other elements based on geo-accumulation index evaluation. Hg exhibited the strongest enrichment feature with the average enrichment factor of 8.41. Compare with modified contamination degree and pollution load index, Nemerow pollution index method obtained the most serious evaluation results that 45.67% and 16.54% of sampling sites possessed high and moderate pollution. Evaluation results of potential ecological risk index showed that trace elements in soils posed very high and considerable ecological risks in 34.65% and 7.09% of sampling sites, respectively. Mining area was the region with the most serious pollution and ecological risks. Average bioaccumulation factor (BCF) values of target trace elements ranged from 0.05 (REEs) to 2.67 (Cr). Cr was the element that was easier to bio-accumulate in plants of the study area than the other target elements. It is in urgent need to take effective measures for controlling current pollution and potential ecological risks of trace elements in soils of the northeastern Qinghai-Tibet Plateau.

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Section: Introductionmentioning

confidence: 99%

Distribution, pollution, bioaccumulation, and ecological risks of trace elements in soils of the northeastern Qinghai-Tibet Plateau

Lü

et al. 2018

Ecotoxicology and Environmental Safety

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“…The THg concentrations in the cell samples were analyzed using a Hydra II C mercury analyzer (Teledyne Leeman Labs, Hudson, USA) according to the USEPA method 7473 (Shao et al, 2016;USEPA, 1998). Briefly, a 50 μL cell suspension of every treated sample was pipetted into a nickel boat.…”

Section: Hg Analysismentioning

confidence: 99%

Distinct toxicological characteristics and mechanisms of Hg2+ and MeHg in Tetrahymena under low concentration exposure

Liu

Cao

et al. 2017

Aquatic Toxicology

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Inorganic divalent mercury complexes (Hg) and monomethylmercury complexes (MeHg) are the main mercury species in aquatic systems and their toxicity to aquatic organisms is of great concern. Tetrahymena is a type of unicellular eukaryotic protozoa located at the bottom of food chain that plays a fundamental role in the biomagnification of mercury. In this work, the dynamic accumulation properties, toxicological characteristics and mechanisms of Hg and MeHg in five Tetrahymena species were evaluated in detail. The results showed that both Hg and MeHg were ingested and exhibited inhibitory effects on the proliferation or survival of Tetrahymena species. However, the ingestion rate of MeHg was significantly higher than that of Hg. The mechanisms responsible for the toxicity of MeHg and Hg were different, although both chemicals altered mitochondrial membrane potential (MMP). MeHg disrupted the integrity of membranes while Hg had detrimental effects on Tetrahymena as a result of the increased generation of reactive oxygen species (ROS). In addition, the five Tetrahymena species showed different capacities in accumulating Hg and MeHg, with T. corlissi exhibiting the highest accumulations. The study also found significant growth-promoting effect on T. corlissi under low concentration exposure (0.003 and 0.01μg Hg/mL (15 and 50nM)), suggesting different effect and mechanism that should be more closely examined when assessing the bioaccumulation and toxicity of mercury in aquatic ecosystems.

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“…"Heavy metals" term called on a group of metals and metalloids with density >4 g/cm 3 and have environmental concern [1]. Some of them are essential micronutrients (e.g.…”

Section: Introductionmentioning

confidence: 99%

“…Heavy metals are generally non-biodegradable in natural environments with low concentrations and some of them are essential micronutrients [2]. Elevated concentrations of heavy metals in the environment can threaten the food chain, causing various harmful problems for plants, animals, and humans [3]. Introduced heavy metals hazards to food chain are related to their bioaccumulation and bio-magnifications through biogeochemical processes [4], their toxicity, persistence, and nonbiodegradability [5].…”

Section: Introductionmentioning

confidence: 99%

Evaluation of Heavy Metals Pollution by using pollution indices in the Soil of Assiut District, Egypt

et al. 2019

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A SSIUT District represents an important part of central Nile Valley. It is a complex district containing many big industries, urbanization and agricultural activities. These activities can lead to the pollution of agricultural soil with toxic heavy metals. The aim of this work is the assessment of potential risks of these metals in soils using pollution indices; Enrichment Factor (EF), Index of Geoaccumulation (I geo ), Contamination Factor (CF), Ecological Risk Factor (E r ), Degree of Contamination (C d ), Pollution Load Index (PLI) and Potential Ecological Risk Index (PERI). The present study calculated the mentioned indices for eight heavy metals; As, Cd, Co, Cr, Cu, Ni, Pb, and Zn.Pollution indices calculations revealed that the investigated area can considered generally moderately polluted with the studied heavy metals. The emission of heavy metals from the factories as well as agricultural practices, urban runoff and sewage stations in the zone may be the source of that pollution. Consequently, control methods must be functional to the area adjacent to the factories to diminish the pollution. Finally, the studied cultivated soils showed low pollution than other cultivated soils in Australia,

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Mercury in alpine fish from four rivers in the Tibetan Plateau

Cited by 37 publications

References 44 publications

Distribution, pollution, bioaccumulation, and ecological risks of trace elements in soils of the northeastern Qinghai-Tibet Plateau

Distribution, pollution, bioaccumulation, and ecological risks of trace elements in soils of the northeastern Qinghai-Tibet Plateau

Distinct toxicological characteristics and mechanisms of Hg2+ and MeHg in Tetrahymena under low concentration exposure

Evaluation of Heavy Metals Pollution by using pollution indices in the Soil of Assiut District, Egypt

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