Major and trace elements of river-borne material: The Congo Basin

Dupré, Bernard; Gaillardet, Jérôme; Rousseau, Dominique; Allègre, Claude J.

doi:10.1016/0016-7037(96)00043-9

Cited by 355 publications

(170 citation statements)

References 45 publications

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“…Interestingly, dissolution of trace elements (e.g. Sc, REEs) into the Congo River and its main tributaries (Dupré et al 1996) as well as their accumulation in clay-rich sediments in Uganda (Nyakairu and Koeberl 2001) have been reported. On a world scale, the concentrations of trace elements in the Congo River are among the highest measured (Dupré et al 1996).…”

Section: Differentiation Between Sex Age and Feather Typesmentioning

confidence: 99%

Elemental composition in feathers of a migratory passerine for differentiation of sex, age, and molting areas

Óvári

Laczi

Török

et al. 2016

Environ Sci Pollut Res

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AcknowledgmentsThe authors would like to thank Tamás Weiszburg for the SEM/BSE measurements performed at the Department of Mineralogy and Geochemistry of Eötvös Loránd University.The assistance of Tamás Szigeti, MSc and Gergely Tarsoly, MSc provided in the microwaveassisted digestion of feathers is also appreciated. Keywords: breeding, elemental distribution, habitat, inductively coupled plasma mass spectrometry, laser ablation, migratory birds, rare earth elements.3 HighlightsAmong the 38 elements investigated, toxic elements (i.e. Ni, Cd, Hg and Pb) occurred in more than the 55% of the tail feather of the collared flycatchers at the µg/g level.Differentiation between sex, age and molting areas of the collared flycatcher was possible by determination of feather elemental composition.Time-resolved distribution of major elements along the rachis of feathers by laser ablation ICP-SF-MS and normalization of the intensities to 13 C/ 34 S signals.4

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Section: Differentiation Between Sex Age and Feather Typesmentioning

confidence: 99%

Elemental composition in feathers of a migratory passerine for differentiation of sex, age, and molting areas

Óvári

Laczi

Török

et al. 2016

Environ Sci Pollut Res

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“…As (Sioli 1957, Santos et al 1985, Santos e Ribeiro 1988, Konhauser et al 1994, Dupré et al 1996, Gaillardet et al 1997e Küchler et al, 2000 e compatíveis com outros igarapés próximos (Campos, 1994;Silva et al, 1999) e com as águas de precipitação na região (Neiva & Cunha, 2000). A menor acidez no período seco difere do observado por Silva et al (1999) no igarapé Barro Branco, também localizado nas proximidades da área urbana de Manaus.…”

Section: Methodsunclassified

“…1), especialmente no Puraquequara no período de estiagem, cuja razão entre eles alcança 3,2 mg/L. Essa diferença na carga química, que pode ser atribuída à falta de quantificação de outros íons, é natural nos rios de água clara e preta na Amazônia (Campos 1994, Dupré et al 1996e Küchler et al, 2000. Essa deficiência em íons também pode explicar a não correlação entre a carga total dissolvida e a condutividade, apesar de que, segundo Küchler et al (2000), em rios de água preta o carbono orgânico é que mantém correlação com esse parâmetro.…”

Section: Parâmetros Químicosunclassified

“…Atualmente, os igarapés que drenam a cidade estão totalmente degradados pelo aporte de efluentes domésticos e industriais (Silva, 1996;Barroncas, 1999;Silva et al, 1999, entre outros). Com o avanço da urbanização novas áreas estão em fase de degradação sem que se conheçam as características originais das suas águas superficiais, que são os melhores parâmetros para medir a qualidade, o grau de impacto, entender os mecanismos que controlam a concentração dos elementos químicos nos rios (Shiller, 1997), caracterizar a lixiviação e a ciclagem das espécies químicas (Forti et al, 1997) e estimar processos erosivos (Dupré et al 1996) e de transporte dos elementos nas águas naturais (Viers et al, 1997). Todas essas informações permitem otimizar o gerenciamento dos recursos hídricos de uma região.…”

Section: Introductionunclassified

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Contribuição à hidroquímica de drenagens no Município de Manaus - AM

Horbe

Gomes

Miranda³

et al. 2005

Acta Amaz.

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RESUMOO rio Puraquequara, e seu afluente direito, o igarapé Água Branca, localizam-se fora da zona urbana de Manaus e estão com a bacia ainda protegida por floresta primária. Têm características geológicas, pedológicas e climatológicas de igarapés naturais de terrafirme da Amazônia Central. PALAVRAS CHAVEÁguas naturais, rios da Amazônia, águas pretas, parâmetros físicos. Contribution to the hydrochemistry of drainages in the municipality of Manaus-Am ABSTRACT The Puraquequara River and its right-bank's tributary, the Água Branca stream, are located in the outskirts of the Manaus urbanized area and their basin is still harbored by the primary rain forest cover. They exhibit 'terra firme' geologic, pedologic and climatological characteristics pertaining to the Amazonian region. Samples for this research were collected in November 1998 (dry season) and April 1999 (rainy season KEYWORDSNatural waters, Amazonian river, black water, physical and chemical parameters.

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“…Alkaline earth metals such as Sr and Ba are known to be relatively mobile in natural oxic and aqueous environments (Dupre et al, 1996;Gaillardet et al, 1999). Sr concentration of YRS sediments ranges from ~45 to 156 µg g -1 (mean: 75 ± 22 µg g -1 ) and shows no definite downstream trend.…”

Section: Strontium and Bariummentioning

confidence: 99%

Sediment geochemistry of the Yamuna River System in the Himalaya: Implications to weathering and transport

2004

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Bed sediments of the Yamuna River and its tributaries in the Himalaya (Yamuna River System, YRS) have been analyzed for major elements and trace metals (Sr, Ba, Ni, Cu, Co, Zn, Pb and Cr). These results have been used to characterize chemical weathering and transport in the Himalaya, to assess relative mobility of elements during weathering and to understand heavy metal association. Concentrations of major and trace elements of YRS sediments vary between 20 and 50%. In general, elemental variability reduces when data are analyzed individually for the major rivers, suggesting that tributaries draining diverse lithology contribute significant variations. Comparison of sediment chemistry with composition of source rocks and average Upper Continental Crust (UCC) suggests significant loss of Na, K, Ca and Mg from source rocks during weathering, the degree of loss being more for Ca and Na. Chemical index of alteration (CIA) for YRS sediments averages at 59, indicating that weathering in the basin is of moderate intensity. This inference is also supported by major ion chemistry of YRS waters and is attributed to steep gradient and enhanced physical erosion in the basin. Available results seem to indicate that Na and Sr are effectively more mobile than Ba, which is thought to be a combined effect of higher solubility of Na and Sr, and the affinity of Ba to be adsorbed onto solid phase. Heavy metals show significant positive correlation with Al and weak correlation with Fe, Mn and P. These observations suggest that metal concentrations are controlled mainly by clay mineral abundances, and that Fe-Mn oxides and organic matter may be playing less significant role. Heavy metal concentrations of YRS sediments are lower than those of suspended particulates of the Yamuna river, presumably due to higher clay mineral abundances in the latter. Strong association of metals with Al, and lower metal concentrations in bed sediments compared to suspended matter underscores the importance of sediment transport and mineral sorting in influencing the YRS sediment chemistry. Enrichment factor and geo-accumulation index calculated for heavy metals in YRS sediments suggest that they are mainly of natural origin and that anthropogenic activities exert little influence on their abundances.

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Major and trace elements of river-borne material: The Congo Basin

Cited by 355 publications

References 45 publications

Elemental composition in feathers of a migratory passerine for differentiation of sex, age, and molting areas

Elemental composition in feathers of a migratory passerine for differentiation of sex, age, and molting areas

Contribuição à hidroquímica de drenagens no Município de Manaus - AM

Sediment geochemistry of the Yamuna River System in the Himalaya: Implications to weathering and transport

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