Transport phases of transition metals in the Amazon and Yukon Rivers

Gibbs, Ronald J.

doi:10.1130/0016-7606(1977)88<829:tpotmi>2.0.co;2

Cited by 531 publications

(177 citation statements)

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“…Este fato sugere uma baixa mobilidade de Co associado aos sedimentos superficiais nessa região. O predomínio da fração total de Co sobre a móvel, sugere que o transporte desse elemento-traço para o ambiente sedimentar ocorra de forma agregada a partículas cristalinas de minerais, acordando com estudos de Gibbs (1977), que afirma que as partículas cristalinas transportam 44% do cobalto total carreado pelo rio Amazonas. A distribuição dos teores de cobalto em relação a profundidade da Plataforma esta apresentada na figura 3.…”

Section: Resultsunclassified

Determinação dos elementos-traço (Zn, Co e Ni) em sedimentos da Plataforma Continental Amazônica sob influência da descarga do rio Amazonas

Siqueira¹,

Pereira²,

Aprile

2006

Acta Amaz.

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RESUMOEsta pesquisa foi desenvolvida na Plataforma Continental Amazônica (PCA) no trecho compreendido entre os cabos Orange (AP) e Maguari (PA), para determinar os teores de Zn, Co e Ni nos sedimentos superficiais, identificando o papel dos sedimentos como fonte ou reserva de elementos-traço. A concentração dos elementos metálicos apresentou a seguinte associação: Zn > Ni > Co. Os sedimentos localizados na PCA podem ser considerados como sítio de ocorrência natural dos elementos metálicos, não havendo influência de fontes poluidoras na liberação destes para o sistema. PALAVRA CHAVE Elementos-traço, sedimento, Plataforma Continental AmazônicaDetermination of trace elements (Zn, Co and Ni) in sediments at the Amazon Continental shelf on influence of the Amazon River discharge (Pará State), to determine the levels of zinc, cobalt and nickel in the superficial sediments identifying its inputs and outputs. The rate of these metallic elements in the sediments decreases following Zn> Ni> Co. The concentrations of total metals in the surface sediments range from ). The levels of trace elements observed in the sediments at ACS are of natural occurrence. Pollution sources of metallic elements were not observed. ABSTRACT Determination of trace elements (Zn, Co and Ni) in sediments at the Amazon Continental Shelf on influence of the Amazon River discharge This research was developed at Amazon Continental Shelf (ACS) between the Orange Cape (Amapá State) and the Maguari Cape

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Section: Resultsunclassified

Determinação dos elementos-traço (Zn, Co e Ni) em sedimentos da Plataforma Continental Amazônica sob influência da descarga do rio Amazonas

Siqueira¹,

Pereira²,

Aprile

2006

Acta Amaz.

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“…Thus, in most river systems the concentration of trace elements in bed sediments is far greater than the concentration of trace elements dissolved in the water column (Gibbs, 1977;Horowitz, 1991). Trace elements occur naturally, at a variety of concentrations, in the bed sediments of rivers and lakes, and their occurrence is primarily the result of weathering of rocks at the Earth's surface.…”

Section: Trace and Other Element Occurrence In Bed And Suspended Sedimentioning

confidence: 99%

Sediment-quality assessment of Franklin D. Roosevelt Lake and the upstream reach of the Columbia River, Washington, 1992

2001

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“…These five categories have different behavior with respect to remobilization under changing environmental conditions (Jain et al, 2008). The fractions introduced by human's activity include the adsorptive, exchangeable and bound to carbonates/acid soluble phase, which are considered to be weakly bound metals and may equilibrate with the aqueous phase thus becoming more rapidly bioavailable (Gibbs, 1977). The Fe-Mn oxide/reducible and organic matter/oxidisable phase have scavenging effect and may provide a sink for metals.…”

Section: Geochemical Partitioning Of Zn and Pb In Sediments Of Nomi Rmentioning

confidence: 99%

Rare Earth Elements and Geochemical Partitioning of Zn and Pb in Sediments of an Urban River

Sharmin¹,

Zakir²,

Shikazono³

2010

American Journal of Environmental Sciences

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Problem statement: Urban river sediment pollution due to Zn and Pb is a serious problem in all over the world. The source and level of Zn and Pb pollution in sediments of Nomi River of Ota Ward, one of the most industrialized areas in Tokyo, Japan is still lacking. Approach: The present study focused on Rare Earth Elements (REEs) and geochemical partitioning of Zn and Pb in sediments of 19 sampling sites of Nomi River in order to examine the mobility pattern. The amounts of Zn and Pb in the liquid extract of 5 (five) geochemical phases were measured by using Inductively Coupled Plasma Mass Spectrometry (ICP-MS) and the concentrations of REEs in sediments were determined by using X-ray Fluorescence Spectroscopy (XRF). Results: Speciation data indicate dominant labile fraction of Zn, which is related to the presence of several anthropogenic influence of the investigated area. Enrichment Factor (EFc) and Index of geoaccumulation (I geo ) value were compatible with the result, which confirm pollution status of Zn. Environmental risk of Zn and Pb were also evaluated using the Risk Assessment Code (RAC) and sequential extraction results and found Zn poses high to very high risk (34-59), whereas Pb poses low to medium environmental risk (0-19). Conclusion: The mean values of REEs and other minor elements were lower or very close to average shale and Japanese river sediment value but Sr, Sn, Zr and Sb contents were little bit higher than average Japanese river sediment values. Anthropogenic activities, prevalent in the study area play a key role in the accumulation of Zn and Pb in aquatic system. Early warning on the sediment pollution to respective authorities help in preserving the aquatic system from further degradation of the river.

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Transport phases of transition metals in the Amazon and Yukon Rivers

Cited by 531 publications

References 0 publications

Determinação dos elementos-traço (Zn, Co e Ni) em sedimentos da Plataforma Continental Amazônica sob influência da descarga do rio Amazonas

Determinação dos elementos-traço (Zn, Co e Ni) em sedimentos da Plataforma Continental Amazônica sob influência da descarga do rio Amazonas

Sediment-quality assessment of Franklin D. Roosevelt Lake and the upstream reach of the Columbia River, Washington, 1992

Rare Earth Elements and Geochemical Partitioning of Zn and Pb in Sediments of an Urban River

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