10 documents found, page 1 of 1

Spreading eutrophication and changing CO2 fluxes in the tropical coastal ocean:...

In Brazil and in many other tropical countries, large urban cities and populations are still growing on the coast and coverage in terms of sewage treatments is far from desirable. Cultural eutrophication is not solely a threat for the coastal ocean; it is now acting as one of its major biogeochemical and ecological driver. Along the littoral of the state of Rio de Janeiro, semi-enclosed marine bays and lagoons ...

Balanço do mercúrio numa lagoa costeira hipertrófica (Lagoa Rodrigo de Freitas,...

ste estudo apresenta uma estimativa do balanço de massa de Hg na lagoa costeira identificada como a mais contaminada por este metal no litoral do Estado do Rio de Janeiro (Lagoa Rodrigo de Freitas). Foram avaliadas as concentrações de Hg nos sedimentos e nas águas da coluna d'água da Lagoa, do canal de ligação com o mar, do rio que drena para lagoa, das galerias pluviais, do escoamento superficial e na chuva, a...

Mercury, zinc, manganese, and iron accumulation in leachate pondsediments from ...

This work evaluates Hg, Zn, Fe and Mn transfer from the leachate of a refuse tip based on their accumulation in a sediment core of 17 cmcollected in a leachate pond of a small refuse tip ageing approximately 10 years. Sediment samples were digested with an acid mixture (50%acqua regiasolution), heated at 70 °C during 1 h, in a thermal-kinetic reactor“cold finger”. The extract was analysed to obtain Hg content b...

Metal Bioaccumulation by the Neotropical Clam Anomalocardia flexuosa to Estimat...

Made available in DSpace on 2021-06-25T10:48:30Z (GMT). No. of bitstreams: 0 Previous issue date: 2021-01-01; This investigation evaluated the bioaccumulation potential of the tropical estuarine bivalve Anomalocardia flexuosa for trace metals. To this aim, chemical and sedimentological analyses and bioaccumulation tests were performed. The sediments were mainly composed by fine-sands and mud, with variable leve...

Metal bioaccumulation by the neotropical clam Anomalocardia flexuosa to estimat...

This investigation evaluated the bioaccumulation potential of the tropical estuarine bivalve Anomalocardia flexuosa for trace metals. To this aim, chemical and sedimentological analyses and bioaccumulation tests were performed. The sediments were mainly composed by fine-sands and mud, with variable levels of organic matter and CaCO3. Muddy sediments from a depositional site (P2) presented the highest concentrat...

Integrating multiple lines of evidence of sediment quality in a tropical bay (G...

Made available in DSpace on 2019-10-06T17:16:00Z (GMT). No. of bitstreams: 0 Previous issue date: 2019-09-01; Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES); Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq); Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP); Fundação de Amparo à Pesquisa do Estado do Rio de Janeiro (FAPERJ); The present study evaluated the ec...

Sediment quality in a metal-contaminated tropical bay assessed with a multiple ...

Made available in DSpace on 2018-11-26T17:35:06Z (GMT). No. of bitstreams: 0 Previous issue date: 2017-09-01; Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES); Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq); A sediment quality assessment was performed near to the main industrial source of metal contamination in Sepetiba Bay, Brazil, which represents one of the worst case...

Ion Exchange Chromatography and Mass Bias Correction for Accurate and Precise Z...

Precise and accurate d66/64Zn data for environmental reference materials (RMs) including rocks, sediments, soils and plants are presented in order to improve the metrological traceability and analytical control of Zn isotope ratio determinations in future environmental studies. Previously developed ion exchange chromatography protocols were adjusted to enable faster sample throughput and instrumental mass bias ...

Variabilidade espacial da assinatura isotópica de zinco em sedimentos superfica...

Variabilidade espacial e sazonal da concentração de elementos-traço em sediment...

Submitted by Guilherme Lemeszenski (guilherme@nead.unesp.br) on 2013-08-22T18:48:35Z No. of bitstreams: 1 S0100-40422006000200016.pdf: 558536 bytes, checksum: ecd579526d7f798e9d1078f278864184 (MD5); Made available in DSpace on 2013-08-22T18:48:35Z (GMT). No. of bitstreams: 1 S0100-40422006000200016.pdf: 558536 bytes, checksum: ecd579526d7f798e9d1078f278864184 (MD5) Previous issue date: 2006-04-01; Made availabl...