Importance of geomorphology and sedimentation processes for metal dispersion in sediments and soils of the Ganga Plain: identification of geochemical domains

Ansari, Andrianto; Singh, Indra Bir; Tobschall, H. J.

doi:10.1016/s0009-2541(99)00073-x

Cited by 56 publications

(24 citation statements)

References 37 publications

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“…The metal enrichment factor for five metals was calculated and it was found that the values of all the metals at depths 1. 52, 7.62, 9.15, 12.2, 13.72, 19.82, 25.92, and 30.5 m show considerable enrichment showing moderate to significant metal enrichment in the aquifer sediments indicating the episodic sediment deposition (recent Holocene) in the flood plains, i.e., high discharges and low discharges over several decades in the region (Ansari et al 2000). The enrichment values are also indicative of the dynamic nature of flood plain deposits over the recent Holocene deposition.…”

Section: Enrichment Factormentioning

confidence: 97%

Metal speciation studies in the aquifer sediments of Semria Ojhapatti, Bhojpur District, Bihar

Kumar

Ramanathan

Prabha

et al. 2011

Environ Monit Assess

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The pollution of aquifer sediments by heavy metals has assumed serious concern due to their toxicity and accumulative behavior. Changes in environmental conditions can strongly influence the behavior of both essential and toxic elements by altering the forms in which they occur and therefore quantification of the different forms of metal is more meaningful than total metal concentrations. In this study, fractionation of metal ions in aquifer sediments of Semria Ojhapatti area, Bhojpur district, Bihar has been studied to determine the ecotoxic potential of metal ions. The investigations suggest that iron, copper, and arsenic have a tendency to remain associated in the following order residual > reducible > acid-soluble > oxidizable; manganese and zinc have tendency to be associated as residual > acid-soluble > reducible > oxidizable. The risk assessment code reveals that manganese and zinc occur in significant concentration in acid-soluble fraction and therefore comes under the high risk category and can easily enter the food chain. Most of the iron, copper, and arsenic occur as immobile fraction (i.e. residual) followed by its presence in reducible fraction and would pose threat to the water quality due to changing redox conditions. The metal enrichment factor in the study area shows moderate to significant metal enrichment in the aquifer sediments which may pose a real threat in near future. The geo-accumulation index of metals also shows that the metals lie in the range of strongly contaminated (for iron at shallow depths) to moderately contaminated to uncontaminated values.

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Section: Enrichment Factormentioning

confidence: 97%

Metal speciation studies in the aquifer sediments of Semria Ojhapatti, Bhojpur District, Bihar

Kumar

Ramanathan

Prabha

et al. 2011

Environ Monit Assess

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“…River sediments, therefore, are important sources for the assessment of man-made contamination in rivers. Several studies on the distribution of heavy metals in sediments of the river Ganges and its tributaries have been carried out (Ajmal et al, 1983;Subramanian et al, 1987;Saikia et al, 1988;Jha et al, 1990;Ansari et al, 2000;Dutta and Subramanian, 1998;Ramesh et al, 2000;Singh, 2001). Singh et al (2002) also reported that highly polluted sediments are adversely affecting the ecological functioning of rivers due to heavy metal mobilization from urban areas into biosphere.…”

Section: Introductionmentioning

confidence: 99%

Distribution of heavy metals in sediment and water of river Gomti

Gaur

Gupta

Pandey

et al. 2005

Environ Monit Assess

209

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Gomti river receives industrial as well as domestic wastes from various drains of Lucknow city. In the process the water and sediment of the river Gomti get contaminated with heavy metals and other pollutants. In the present study, impacts of domestic/industrial wastes on the water and sediment chemistry of river Gomti with special reference to heavy metals have been investigated in different seasons (summer, winter and rainy). For this, seven sampling sites: Gaughat, Mohan Meakin, Martyr's Memorial, Hanuman Setu, Nishatganj bridge, Pipraghat and Malhaur, in the river Gomti in Lucknow region were identified and samples of water and sediments were collected in all the three seasons. In the collected water and sediment samples, six metals (Cd, Cr, Cu, Ni, Pb, and Zn) were analyzed on ICP-AES (Inductively coupled plasma emission spectroscopy) Labtam Plasmalab 8440. High concentrations of all the metals were noticed in water and sediment in rainy season compared to summer and winter. Because in rainy season runoff from open contaminated sites, agricultural field and industries, directly comes into the river without any treatment. In both the cases, the concentration of zinc was maximum (0.091 microg/ml in water and 182.13 microg/g in sediment) and the concentration of cadmium (0.001 microg/ml in water and 17.26 microg/g in sediment) was minimum. Higher concentration of metal in water and sediment during rainy season could be due to the industrial/agricultural/domestic runoff coming into the river.

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“…Esses processos, por sua vez, atuam sobre os diversos tipos de rocha e/ou seus produtos de intemperização in situ, localizados na bacia de drenagem. Desta forma, as amostras de sedimento de rios, lagos e lagoas representam a integração de todos os processos que ocorrem no ecossistema aquá-tico à montante e têm sido investigadas para elucidar a poluição ambiental atribuída aos elementos-traço e/ou substâncias tóxicas orgânicas [1][2][3][4][5] . Em ecossistemas aquáticos, o sedimento de fundo representa o principal compartimento de acumulação, reprocessamento e transferência dos elementos-traço 6 .…”

Section: Lichtunclassified

Referência geoquímica regional para a interpretação das concentrações de elementos químicos nos sedimentos da bacia do Lago Paranoá - DF

Cosme¹,

Moreira²

2003

Quím. Nova

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. The present study aimed at determining a regional geochemical reference for sediment samples from Lago Paranoá watershed through the formulation of geoaccumulation indexes. The need for obtaining information from areas representing low human impact was the basis of this work. Systematic evaluations of sediment from Lago Paranoá will bring valuable information regarding the potential risk that this layer represents for aquatic organisms. Thus, despite the recent water quality improvements achieved in this ecosystem, contaminants incorporated in the sediments may be remobilized for alterations in the adjacent environment. The adsorption capacity of chemical elements in sediment samples was controlled through the variation in the amounts of organic matter, the mineralogical composition and the granulometric variation. By creating the Sediment Enrichment Index (SEI) through the normalization of analytical data it was possible to establish the magnitude of this enrichment relatively to naturally occurring concentrations all over the region of interest. Normalized values with organic matter were especially useful for the evaluation of lothic systems.Keywords: geoaccumulation index; sediment enrichment index; organic matter. INTRODUÇÃO Licht1 descreve o sedimento de fundo como sendo aquele material não consolidado, distribuído ao longo dos vales do sistema de drenagem e orientado a partir da interação constante e contínua dos processos de intemperismo e erosão. Esses processos, por sua vez, atuam sobre os diversos tipos de rocha e/ou seus produtos de intemperização in situ, localizados na bacia de drenagem. Desta forma, as amostras de sedimento de rios, lagos e lagoas representam a integração de todos os processos que ocorrem no ecossistema aquá-tico à montante e têm sido investigadas para elucidar a poluição ambiental atribuída aos elementos-traço e/ou substâncias tóxicas orgânicas 1-5 . Em ecossistemas aquáticos, o sedimento de fundo representa o principal compartimento de acumulação, reprocessamento e transferência dos elementos-traço 6 . Esses elementos, potencialmente disponíveis para a biota, podem ser liberados pela atividade microbiana e mudanças nos vários fatores físico-químicos que afetam o meio, incluindo pH, salinidade e condições de óxido-redução.Rodrigues 5 descreve que estas substâncias poluentes podem atingir os ecossistemas aquáticos por meio de fontes difusas, como o escoamento superficial de áreas agrícolas e urbanas, águas subterrâ-neas contaminadas, remobilização a partir do sedimento, disposição de material dragado e precipitação atmosférica, e/ou fontes pontuais, como descargas de efluentes industriais e urbanos.O levantamento dessas informações torna possível a obtenção de ferramentas complementares que permitam definir as medidas de prevenção, correção e monitoramento adequadas à condução do processo de gestão ambiental, objetivando a manutenção ou mesmo o melhoramento da qualidade ambiental. Como exemplo dessas ferramentas citase a normalização de um elemento de referência para a comparação...

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Importance of geomorphology and sedimentation processes for metal dispersion in sediments and soils of the Ganga Plain: identification of geochemical domains

Cited by 56 publications

References 37 publications

Metal speciation studies in the aquifer sediments of Semria Ojhapatti, Bhojpur District, Bihar

Metal speciation studies in the aquifer sediments of Semria Ojhapatti, Bhojpur District, Bihar

Distribution of heavy metals in sediment and water of river Gomti

Referência geoquímica regional para a interpretação das concentrações de elementos químicos nos sedimentos da bacia do Lago Paranoá - DF

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