Speciation and ecological risk of toxic elements in estuarine sediments affected by multiple anthropogenic contributions (Guadiana saltmarshes, SW Iberian Peninsula): I. Surficial sediments

Delgado, Joaquín Montalván; Barba-Brioso, Cinta; Nieto, José Miguel; Boski, Tomász

doi:10.1016/j.scitotenv.2011.06.013

Cited by 121 publications

(65 citation statements)

References 75 publications

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“…On the other hand, a low % of association with the acid-soluble fractions (F1) was observed for most of the remaining metals: Zn (32.44%) > Ni (27.06%) > Cu (24.37%) > Pb (6.29%) > As (3.90%) ˃ Cr (2.74%). These results were in accord with previous studies that highlight that the potential risks caused by Cd were extremely associated with F1 [12]. However, the potential ecological risks still exist and cannot be ignored even with the low % of association with the mobile fraction since environmental conditions could modify this scenario [13].…”

Section: Distribution Of Metals In Sedimentssupporting

confidence: 92%

Multivariate Analyses and Evaluation of Heavy Metals by Chemometric BCR Sequential Extraction Method in Surface Sediments from Lingdingyang Bay, South China

Cao¹,

Tian²,

Yang³

et al. 2015

Sustainability

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Sediments in estuary areas are recognized as the ultimate reservoirs for numerous contaminants, e.g., toxic metals. Multivariate analyses by chemometric evaluation were performed to classify metal ions (Cu, Zn, As, Cr, Pb, Ni and Cd) in superficial sediments from Lingdingyang Bay and to determine whether or not there were potential contamination risks based on the BCR sequential extraction scheme. The results revealed that Cd was mainly in acid-soluble form with an average of 75.99% of its total contents and thus of high potential availability, indicating significant anthropogenic sources, while Cr, As, Ni were enriched in the residual fraction which could be considered as the safest ingredients to the environment. According to the proportion of secondary to primary phases (KRSP), Cd had the highest bioavailable fraction and represented high or very high risk, followed by Pb and Cu with medium risks in most of samples. The combined evaluation of the Pollution Load Index (PLI) and the mean Effect Range Median Quotient (mERM-Q) highlighted that the greatest OPEN ACCESSSustainability 2015, 7 4939 potential environmental risk area was in the northwest of Lingdingyang Bay. Almost all of the sediments had a 21% probability of toxicity. Additionally, Principal Component Analysis (PCA) revealed that the survey region was significantly affected by two main sources of anthropogenic contributions: PC1 showed increased loadings of variables in acid-soluble and reducible fractions that were consistent with the input from industrial wastes (such as manufacturing, metallurgy, chemical industry) and domestic sewages; PC2 was characterized by increased loadings of variables in residual fraction that could be attributed to leaching and weathering of parent rocks. The results obtained demonstrated the need for appropriate remediation measures to alleviate soil pollution problem due to the more aggregation of potentially risky metals. Therefore, it is of crucial significance to implement the targeted strategies to tackle the contaminated sediments in Lingdingyang Bay.

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Section: Distribution Of Metals In Sedimentssupporting

confidence: 92%

Multivariate Analyses and Evaluation of Heavy Metals by Chemometric BCR Sequential Extraction Method in Surface Sediments from Lingdingyang Bay, South China

Cao¹,

Tian²,

Yang³

et al. 2015

Sustainability

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“…Indeed, changes in environmental conditions such as acidification, changes in the redox potential conditions or increase in organic ligand concentrations can cause element mobilization from solid to liquid phase and migrating to waters (Delgado et al 2011). Sequential extraction methods are often intended to simulate the various possible natural and anthropogenic modifications of environmental conditions such as acidification or oxidation (Cappuyns et al 2007).…”

Section: Introductionmentioning

confidence: 99%

Sequential extraction of calcium in lake sediments for investigating the cycle of phosphorus in water environment

Liu

Zhu

et al. 2014

Int. J. Environ. Sci. Technol.

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The role of calcium (Ca) in the cycle of phosphorus in water environment depends on the speciation of Ca in sediments, and reliable Ca sequential extraction method is useful for obtaining information about Ca transport processes from sediment to water. Experiments have been carried out to develop a simple but robust Ca sequential extraction method for identification of Ca portioning in sediments. The sequential extraction protocol was modified for extractants, extracting time, concentration and pH of the reagents in the first three steps of Tessier sequential procedure. With optimum conditions, there were 1:25 sediment to solution ratio and 3 h of extracting time shaken with NH 4 AC (1 mol L -1 , pH 7.0) (exchangeable Ca fraction); 1:25 sediment to solution ratio and extracted with NH 4 AC (1 mol L -1 , pH 5.0) for 5 h (carbonatebound Ca fraction); and 1:30 sediment to solution ratio and extracted with NH 2 OHÁHCl (0.5 mol L -1 , pH 1.5) for 6 h (Fe and Mn oxides bound Ca fraction). The recovery for Tessier procedure ranged form 35.6 to 71.1 %, while the recovery for the modified Tessier procedure ranged form 46.1 to 86.9 %. These results revealed that Tessier procedure underestimated the proportion of Ca in exchangeable fraction. In sediments, Ca was mainly exchangeable and carbonate bound, which was considered as the most liable fractions.

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“…ARINE sediment forms a dynamic system and functions as reservoirs of metals originating from weathering of parent rocks [1][2][3]. Marine sediment is subjected to various pollutants of natural and artificial origin (mining, industrial, and urban effluents).…”

mentioning

confidence: 99%

Trace Metals Risk Evaluation and Pollution Identification in Surficial Sediment from the Haikou Bay, South China Sea

Shi¹,

Shi²,

Cao³

et al. 2016

JRST

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Potential contamination risks and relevance of source identification for five trace metals (As, Cd, Cr, Cu, and Pb) from surficial sediments obtained in Haikou Bay were investigated by applying a set of multivariate analysis methods for the first time. It was demonstrated that metal concentrations reflecting distribution features for the metals of interest were slightly higher on the east side than those on the west side. A risk assessment conclusion revealed potential contamination areas were present in the vicinity of highly intense human development activities. Speciation obtained by an optimized BCR sequential extraction technique demonstrated that As and Cr were dominated by residual fraction. However, Pb, Cu, and Cd were mainly composed with non-residual fractions and of high bioavailability indicating these trace metals had significant anthropogenic sources. The relationship between content characteristics and trace metal fractions was revealed by Pearsons' correlation analysis. Hierarchical cluster analysis suggested that Pb, Cu, and Cd had similar sources relevant to anthropogenic sources and confirmed by chemical speciation analysis. Results provide a base for the local authority in the area of interest to monitor long term contribution of trace metals in coastal sediments and then apply strategies to address the polluted sediments.

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Speciation and ecological risk of toxic elements in estuarine sediments affected by multiple anthropogenic contributions (Guadiana saltmarshes, SW Iberian Peninsula): I. Surficial sediments

Cited by 121 publications

References 75 publications

Multivariate Analyses and Evaluation of Heavy Metals by Chemometric BCR Sequential Extraction Method in Surface Sediments from Lingdingyang Bay, South China

Multivariate Analyses and Evaluation of Heavy Metals by Chemometric BCR Sequential Extraction Method in Surface Sediments from Lingdingyang Bay, South China

Sequential extraction of calcium in lake sediments for investigating the cycle of phosphorus in water environment

Trace Metals Risk Evaluation and Pollution Identification in Surficial Sediment from the Haikou Bay, South China Sea

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