Assessment on the source of geochemical anomalies in the sediments of the Changjiang river (China), using a modified enrichment factor based on multivariate statistical analyses

Dominech, Salvatore; Albanese, Stefano; Guarino, Annalise; Yang, Shouye

doi:10.1016/j.envpol.2022.120126

Cited by 11 publications

(3 citation statements)

References 89 publications

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“…Among the many factors determining the trace element concentrations in sediments are the geologic source region, the content of organic material and Fe-Mn oxides, and sediment sorting [49,[120][121][122][123]. Therefore, any assessment of enrichment of trace elements needs to be done based on a reference level to investigate deviations from these expected concentrations.…”

Section: Calculation Of a Local Geochemical Baseline And A Local Enri...mentioning

confidence: 99%

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Mixed response of trace element concentrations in fluvial sediments to a flash flood in a former mining area

Weber,

Lehmkuhl

2024

Environ Sci Eur

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Background Floods, especially flash floods, are the major transporting agent for fluvial sediments, whose pollution is a global concern. As floods result in the dispersion of and exposure to these sediments, a profound understanding of sedimentary dynamics during flood events and the related pollutant dispersion is of relevance. However, the characteristics of extreme flood events concerning pollutant dynamics are insufficiently known so far. Results In a Central European catchment impacted by intense industrial activities and former mining, over the course of five years, we surveyed six high-discharge events, five of them approx. bankfull discharge and one major flash flood event, supplemented by sampling of bank sediments. Fluvial sediments were analyzed for elemental composition by X-Ray fluorescence and for grain size distribution of the fine faction by laser diffraction. By applying a local enrichment factor, trace metal(loid) signatures in these sample sets were compared. Furthermore, Positive Matrix Factorization was used to investigate the trace metal(loid)s’ sources. The sediments deposited by minor flooding had continual trace metal(loid) signatures. However, for the extreme event, significant divergencies arose and persisted for the following years: The enrichment of anthropogenically influenced elements increased, with a slowly decreasing trend in the subsequent two years. Naturally dominated metal(oid)s decrease in enrichment without indicating a return to original levels. In contrast, other elements were insensitive to the extreme event. Positive Matrix Factorization identified anthropogenic influences in elements originating from copper and lead processing and mining activities. Furthermore, bed sediments and a natural background factor were found to dominate the non-anthropogenically influenced metal(loid)s. Conclusions In between extreme events, winnowing processes slowly alter the elemental composition of bed sediments. The depletion of such sediments due to the flash flood proves catchment-wide flushing, which induces a natural resetting of the geochemical signals. This ability to renew is an integral part of resilience in fluvial systems. This mechanism is disturbed by industrial activities in floodplains. The exceptional flooding reaches infrastructure that is assumed to be safe and, therefore, unprotected. These additional sources can shift flood sediments’ trace metal(loid) signature, which has a long-lasting impact on the catchment sediments. However, the modifications depend on the flooding extent, possible emitters, and protection measures.

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Section: Calculation Of a Local Geochemical Baseline And A Local Enri...mentioning

confidence: 99%

“…Moreover, a background concentration must be based on maximum homogeneity [124]. Hence, it should be calculated for a specific environmental compartment [123]. Therefore, mean concentrations calculated for rock material are not ideal for evaluating weathered fluvial sediments.…”

Section: Calculation Of a Local Geochemical Baseline And A Local Enri...mentioning

confidence: 99%

Mixed response of trace element concentrations in fluvial sediments to a flash flood in a former mining area

Weber,

Lehmkuhl

2024

Environ Sci Eur

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“…Considering the previously mentioned issues, the current study aims to evaluate the toxicity level of stream sediments and the environmental impact on aquatic life using various pollution indices as well as to identify the source (geogenic or anthropogenic) using spatial and multivariate statistical approaches. Different contamination indices are commonly used in the quality assessment of diverse surroundings, such as soils, water, and sediments [6,[21][22][23][24]. These pollution indices are an objective tool for assessing the contamination degree of several toxic metals.…”

Section: Introductionmentioning

confidence: 99%

Contamination Assessment of Toxic Elements in River Sediments from Baia Mare, Romania—Extreme Pollution from Mining Activities

Bereș,

Maftei,

Dill

et al. 2024

Minerals

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Sediment samples from the Săsar River and its main tributaries were analyzed for their potentially toxic elements at the site of the Romplumb metallurgical company and near the well-known Pb-Zn-Cu epithermal deposit of Baia Sprie located in the Neogene volcanic chain of the Eastern Carpathians, Romania. The average metal concentrations arranged in order of decreasing abundance are as follows (mg·kg−1): Mn (4098) > Zn (2093) > Pb (918) > Cu (489) > As (160) > Cr (37.51) > Ni (30.25) > Co (28.13) > Cd (9.72) > Hg (1.81). Several pollution indices were successfully used to assess the degree of contamination and ecological risk. The majority of sampling sites indicate high degrees of pollution, with two major hotspots identified. There are further sources, such as the Șuior (Pb-Zn-Au) and Săsar (Au-Ag) epithermal deposits, Cuprom company, and Bozânta tailing ponds, identified as contaminants. The Baia Mare mining district is causing a serious threat to the aquatic systems in the region, and it can be taken as a reference area for the human impact derived from the mining of mineral deposits of Au-Ag-Cu-Pb-Zn. It is imperative to reduce ecological risks and thereby protect the population living within this abandoned mining area.

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An integrated overview of metals contamination, source-specific risks investigation in coal mining vicinity soils

Chandra

Proshad

Islam

et al. 2023

Environ Geochem Health

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Assessment on the source of geochemical anomalies in the sediments of the Changjiang river (China), using a modified enrichment factor based on multivariate statistical analyses

Cited by 11 publications

References 89 publications

Mixed response of trace element concentrations in fluvial sediments to a flash flood in a former mining area

Mixed response of trace element concentrations in fluvial sediments to a flash flood in a former mining area

Contamination Assessment of Toxic Elements in River Sediments from Baia Mare, Romania—Extreme Pollution from Mining Activities

An integrated overview of metals contamination, source-specific risks investigation in coal mining vicinity soils

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