Mercury concentration in ecosystem components in water bodies and streams in Khanh Hoa province (Central Vietnam)

Лобус, Н. В.; Komov, V. T.; Thanh, Nguyễn Thị

doi:10.1134/s0097807811060091

Cited by 15 publications

(12 citation statements)

References 20 publications

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“…However, this assumption requires additional study. At the same time, a considerable contribution into the OM supply (C D + C P ) at the down Cai River, its lowland Dau trib utary, and, especially, in the estuary might be made by human economic activity [5,8].…”

Section: Resultsmentioning

confidence: 99%

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Dissolved, particulate, and sedimentary organic matter in the Cai River basin (Nha Trang Bay of the South China Sea)

et al. 2015

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The data were obtained on the content of organic carbon in the water, particulate matter, and bot tom sediments of the Cai River and its tributaries (the basin of Nha Trang Bay). The surface waters of the con sidered basin contained OM mainly in a dissolved form (DOC/POC = 3). The fraction of C org in particulate matter amounted to 4.9% on average. Based on the analysis of n alkanes in bottom sediments, three OM types-autochthonous, mixed, and mainly terrigenous genesis-were distinguished. These types are alter nated in series in the lengthwise profile of the river. All the OM types are in close relation to the peculiarities of sedimentation and hydrodynamics of the waters in the treated aquatic area. The geochemical indices (Pr/Ph, , and CPI values) represent the influence of oxidative conditions on OM formation and the intense microbiological transformation of its autochthonous component.

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Section: Resultsmentioning

confidence: 99%

“…Several private shipyards are situated in the estuary, which deal with manufacturing and repairing of boats and small vessels of wood and com posite materials using polyester resins and hardeners. Manufacturing procedures for covering the vessel hulls use preparations containing anticorrodant and anti fouling substances [5,12].…”

Section: Study Areamentioning

confidence: 99%

Dissolved, particulate, and sedimentary organic matter in the Cai River basin (Nha Trang Bay of the South China Sea)

et al. 2015

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“…In the transitional waters, the salinity (S) increases from the river to the sea and from the surface to the bottom. The water column is highly stratified with the pronounced horizontal and vertical salinity gradients [25,36]. The hydrological regime of the estuarine zone of the Cai River is complicated by daily tides (the tidal range reaches 2 m), seasonal fluctuations in the fresh-water discharge and monsoonal seawater upwelling.…”

Section: Environmental Settingmentioning

confidence: 99%

“…However, notably few data are available relative to the contamination levels and trends. The mercury concentrations in the riverine, estuarine and marine sediments of the region were reported to be at or below the natural levels [24,25]. The aquaculture activity has been reported to contribute to the ecosystem with heavy metals in the farming environment in Nha Trang Bay and Van Phong Bay [35].…”

Section: Introductionmentioning

confidence: 99%

“…The first geochemical study of the Nha Trang Bay covered the distribution of TOC, n-alkanes and the bulk concentration of major and trace elements in the surface sediments [1,17,25,38]. Further analysis and speciation of metals in the sediments of the Cai River estuary and Nha Trang Bay will allow one to track the fate of potential contaminants.…”

Section: Introductionmentioning

confidence: 99%

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Relationship between Bulk Metal Concentration and Bioavailability in Tropic Estuarine Sediments

Koukina¹,

Лобус²,

Peresypkin³

et al. 2016

Applied Studies of Coastal and Marine Environments

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elements, their chemical forms and the mineral composition, organic matter (TOC) and carbonates (TIC) in surface sediments from the Cai River estuary and Nha Trang Bay were first determined along the salinity gradient. The abundance and ratio of major and trace elements in surface sediments are discussed in relation to the mineralogy, grain size, depositional conditions, reference background and SQG values. Most trace-element contents are at natural levels and are derived from the composition of rocks and soils in the watershed. A severe enrichment of Ag is most likely derived from metal-rich detrital heavy minerals such as Ag-sulphosalts. Along the salinity gradient, several zones of metal enrichment occur in surface sediments because of the geochemical fractionation of the riverine material. The parts of actually and potentially bioavailable forms (isolated by four single chemical reagent extractions) are most elevated for Mn and Pb (up to 36% and 32% of the total content, respectively). The possible anthropogenic input of Pb in the region requires further study. Overall, the most bioavailable parts of trace elements are associated with easily soluble amorphous Fe and Mn oxyhydroxides. The sediments are primarily enriched with bioavailable metal forms in the riverine part of the estuary. Natural (such as turbidities) and human-generated (such as urban and industrial activities) pressures are shown to influence the abundance and speciation of potential contaminants and therefore change their bioavailability in this estuarine system.

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Global mercury concentrations in biota: their use as a basis for a global biomonitoring framework

Evers,

Ackerman,

Åkerblom

et al. 2024

Ecotoxicology

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An important provision of the Minamata Convention on Mercury is to monitor and evaluate the effectiveness of the adopted measures and its implementation. Here, we describe for the first time currently available biotic mercury (Hg) data on a global scale to improve the understanding of global efforts to reduce the impact of Hg pollution on people and the environment. Data from the peer-reviewed literature were compiled in the Global Biotic Mercury Synthesis (GBMS) database (>550,000 data points). These data provide a foundation for establishing a biomonitoring framework needed to track Hg concentrations in biota globally. We describe Hg exposure in the taxa identified by the Minamata Convention: fish, sea turtles, birds, and marine mammals. Based on the GBMS database, Hg concentrations are presented at relevant geographic scales for continents and oceanic basins. We identify some effective regional templates for monitoring methylmercury (MeHg) availability in the environment, but overall illustrate that there is a general lack of regional biomonitoring initiatives around the world, especially in Africa, Australia, Indo-Pacific, Middle East, and South Atlantic and Pacific Oceans. Temporal trend data for Hg in biota are generally limited. Ecologically sensitive sites (where biota have above average MeHg tissue concentrations) have been identified throughout the world. Efforts to model and quantify ecosystem sensitivity locally, regionally, and globally could help establish effective and efficient biomonitoring programs. We present a framework for a global Hg biomonitoring network that includes a three-step continental and oceanic approach to integrate existing biomonitoring efforts and prioritize filling regional data gaps linked with key Hg sources. We describe a standardized approach that builds on an evidence-based evaluation to assess the Minamata Convention’s progress to reduce the impact of global Hg pollution on people and the environment.

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Mercury concentration in ecosystem components in water bodies and streams in Khanh Hoa province (Central Vietnam)

Cited by 15 publications

References 20 publications

Dissolved, particulate, and sedimentary organic matter in the Cai River basin (Nha Trang Bay of the South China Sea)

Dissolved, particulate, and sedimentary organic matter in the Cai River basin (Nha Trang Bay of the South China Sea)

Relationship between Bulk Metal Concentration and Bioavailability in Tropic Estuarine Sediments

Global mercury concentrations in biota: their use as a basis for a global biomonitoring framework

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