Geochemical signatures and mechanisms of trace elements dispersion in the area of the Vale das Gatas mine (Northern Portugal)

Ávila, Paula Freire; Oliveira, J. M. Santos; Silva, Eduardo Ferreira da; Fonseca, E. Cardoso

doi:10.1016/j.gexplo.2004.09.001

Cited by 22 publications

(4 citation statements)

References 33 publications

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“…Trace elements such as B, Cd, Cr, Cu, Ni, Pb and Zn are included in a different cluster, which reflects anthropogenic activities and rapidly developing industry sectors that are close to the Rosetta Branch. We also affirm that the main reasons for contamination of surface water by trace elements are leaching and precipitation with increasing human activities [80,81]. Therefore, we state that the main causes for trace elements surface water contamination in the northern Nile Delta are industrial leaching and runoff with increasing human activities.…”

Section: Irrigation Water Quality (Iwq)supporting

confidence: 70%

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Application of Irrigation Water Quality Indices and Multivariate Statistical Techniques for Surface Water Quality Assessments in the Northern Nile Delta, Egypt

Elsayed

Hussein

Moghanm

et al. 2020

Water

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Under sustainable development conditions, the water quality of irrigation systems is a complex issue which involves the combined effects of several surface water management parameters. Therefore, this work aims to enhance the surface water quality assessment and geochemical controlling mechanisms and to assess the validation of surface water networks for irrigation using six Water Quality Indices (WQIs) supported by multivariate modelling techniques, such as Principal Component Regression (PCR), Support Vector Machine Regression (SVMR) and Stepwise Multiple Linear Regression (SMLR). A total of 110 surface water samples from a network of surface water cannels during the summers of 2018 and 2019 were collected for this research and standard analytical techniques were used to measure 21 physical and chemical parameters. The physicochemical properties revealed that the major ions concentrations were reported in the following order: Ca2+ > Na+ > Mg2+ > K+ and alkalinity > SO42− > Cl− > NO3− > F−. The trace elements concentrations were reported in the following order: Fe > Mn > B > Cr > Pb > Ni > Cu > Zn > Cd. The surface water belongs to the Ca2+-Mg2+-HCO3− and Ca2+-Mg2+-Cl−-SO42− water types, under a stress of silicate weathering and reverse ion exchange process. The computation of WQI values across two years revealed that 82% of samples represent a high class and the remaining 18% constitute a medium class of water quality for irrigation use with respect to the Irrigation Water Quality (IWQ) value, while the Sodium Percentage (Na%) values across two years indicated that 96% of samples fell into in a healthy class and 4% fell into in a permissible class for irrigation. In addition, the Sodium Absorption Ratio (SAR), Permeability Index (PI), Kelley Index (KI) and Residual Sodium Carbonate (RSC) values revealed that all surface water samples were appropriate for irrigation use. The PCR and SVMR indicated accurate and robust models that predict the six WQIs in both datasets of the calibration (Cal.) and validation (Val.), with R2 values varying from 0.48 to 0.99. The SMLR presented estimated the six WQIs well, with an R2 value that ranged from 0.66 to 0.99. In conclusion, WQIs and multivariate statistical analyses are effective and applicable for assessing the surface water quality. The PCR, SVMR and SMLR models provided robust and reliable estimates of the different indices and showed the highest R2 and the highest slopes values close to 1.00, as well as minimum values of RMSE in all models.

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Section: Irrigation Water Quality (Iwq)supporting

confidence: 70%

“…contamination of surface water by trace elements are leaching and precipitation with increasing human activities [80,81]. Therefore, we state that the main causes for trace elements surface water contamination in the northern Nile Delta are industrial leaching and runoff with increasing human activities.…”

Section: Cluster Analysismentioning

confidence: 99%

Application of Irrigation Water Quality Indices and Multivariate Statistical Techniques for Surface Water Quality Assessments in the Northern Nile Delta, Egypt

Elsayed

Hussein

Moghanm

et al. 2020

Water

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“…rumpens. 16) Zn (57) No signi cant correlations between total and available soil fraction content and plant concentrations. Trace elements content in all trees, except holm oak.…”

Section: Sediments and Soilsmentioning

confidence: 99%

Pollution Status And Risk Assessment Of Trace Elements In Portuguese Water, Soils, Sediments And Associated Biota: A Trend Analysis From The 80s To 2021

Couto

Ribeiro²

2022

Preprint

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Pollution of water bodies and sediments/soils by trace elements remains a global threat and a serious environmental hazard to biodiversity and human’s health. Globalization and industrialization resulted in the increase and availability of these substances in the environment posing unpredictable adverse effects to living organisms. To determine pollution status and risk contamination by trace elements, data available in literature of the last 40 years on trace elements occurrence in three environmental matrices (water bodies, sediments/soils and biota) from Continental Portugal were collected (about 90 studies). Data were compared to water and sediment quality guidelines to assess potential ecological risks. Most environmentally relevant hazardous elements include Zn, Cu, Cd, Pb, and As. Various studies found trace elements at levels higher than those considered safe by environmental guidelines. In surface waters, Al, Zn, Se and Ag were found above aquatic life limits in about 60% of the reviewed papers, while Cu, Zn and As exceed those values in more than 60% of mining waters. Hg and Cd in sediments from mining areas exceeded aquatic life limits and potential ecological risk showed extremely high risk for most of the elements. The different samples vary in terms of sampling schemes, parameters, and spatiotemporal settings. These differences make meaningful comparisons of the available data difficult but the compilation of scattered environmental spatial and temporal trace elements data, from natural sources or human activity and the ultimate effect on biological systems, is of the upmost importance to broaden its knowledge, risk assessment and implementation of mitigation measures.

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“…From this study it was concluded that As, Cu, Pb and Zn appear as the most harmful elements from an environmental point of view. Table 1 summarizes the statistical characterization of the data set on which the approach used in this paper relies (Freire Ávila et al, 2005). The whole data set of 220 samples was used jointly, given that the relationship structure between elements is the same in tailings and sediment samples, as deduced from Fig.…”

Section: Case Study Presentation: Geology and Samplingmentioning

confidence: 99%

Geostatistical estimation of chemical contamination in stream sediments: The case study of Vale das Gatas mine (northern Portugal)

Salgueiro¹,

Ávila

Pereira³

et al. 2008

Journal of Geochemical Exploration

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Geochemical signatures and mechanisms of trace elements dispersion in the area of the Vale das Gatas mine (Northern Portugal)

Cited by 22 publications

References 33 publications

Application of Irrigation Water Quality Indices and Multivariate Statistical Techniques for Surface Water Quality Assessments in the Northern Nile Delta, Egypt

Application of Irrigation Water Quality Indices and Multivariate Statistical Techniques for Surface Water Quality Assessments in the Northern Nile Delta, Egypt

Pollution Status And Risk Assessment Of Trace Elements In Portuguese Water, Soils, Sediments And Associated Biota: A Trend Analysis From The 80s To 2021

Geostatistical estimation of chemical contamination in stream sediments: The case study of Vale das Gatas mine (northern Portugal)

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