Metal contamination and toxicity of soils and river sediments from the world's largest platinum mining area

Díaz‐Morales, Dakeishla M.; Erasmus, Johannes H.; Bosch, Suanne; Nachev, Milen; Smit, Nico J.; Zimmermann, Sonja; Wepener, Victor; Sures, Bernd

doi:10.1016/j.envpol.2021.117284

Cited by 12 publications

(7 citation statements)

References 48 publications

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“…In recent decades, our demand for metal resources has been increasing, which accelerated the mining of metal mines. The continuous expansion of mining areas led to more and more arable land facing environmental pollution (Diaz-Morales et al, 2021;Li et al, 2022). The increase in HMs will stimulate the production of a large number of reactive oxygen species, which will seriously impact the quality of crops and vegetables (Clemens and Ma, 2016) and lead to human health risks (Xiang et al, 2021).…”

Section: Discussionmentioning

confidence: 99%

Role of the rhizosphere bacterial community in assisting phytoremediation in a lead-zinc area

Xiao

Chen

et al. 2023

Front. Plant Sci.

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Heavy metals (HMs) contamination and vegetation destruction in the mining area caused by mining activities are severely increasing. It is urgent to restore vegetation and stabilize HMs. In this study, we compared the ability of HMs phytoextraction/phytostabilization of three dominant plants, including Artemisia argyi (LA), Miscanthus floridulus (LM), and Boehmeria nivea (LZ) in a lead-zinc mining area in Huayuan County (China). We also explored the role of the rhizosphere bacterial community in assisting phytoremediation using 16S rRNA sequencing technology. Bioconcentration factor (BCF) and translocation factor (TF) analysis showed that LA preferred accumulating Cd, LZ preferred accumulating Cr and Sb, and LM preferred accumulating Cr and Ni. Significant (p < 0.05) differences were found among the rhizosphere soil microbial communities of these three plants. The key genera of LA were Truepera and Anderseniella, that of LM were Paracoccus and Erythrobacter, and of LZ was Novosphingobium. Correlation analysis showed some rhizosphere bacterial taxa (e.g., Actinomarinicola, Bacillariophyta and Oscillochloris) affected some soil physicochemical parameters (e.g., organic matter and pH) of the rhizosphere soil and enhanced the TF of metals. Functional prediction analysis of soil bacterial community showed that the relative abundances of genes related to the synthesis of some proteins (e.g., manganese/zinc-transporting P-type ATPase C, nickel transport protein and 1-aminocyclopropane-1-carboxylate deaminase) was positively correlated with the phytoextraction/phytostabilization capacity of plants for heavy metals. This study provided theoretical guidance on selecting appropriate plants for different metal remediation applications. We also found some rhizosphere bacteria might enhance the phytoremediation of multi-metals, which could provide a reference for subsequent research.

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Section: Discussionmentioning

confidence: 99%

Role of the rhizosphere bacterial community in assisting phytoremediation in a lead-zinc area

Xiao

Chen

et al. 2023

Front. Plant Sci.

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“…Another study that also found this association between metals and toxicity using statistical predictions was done in the Hex River (South Africa). Mining and nearby non‐mining sites sediment and soil eluates reduced survival and reproduction of worms, probably due to the presence of several metals and not only due to the Pt mining (Díaz‐Morales et al, 2021). As in this present work, Fe and Mn were present at higher levels and they were associated with the physiological alterations in the exposed worms.…”

Section: Discussionmentioning

confidence: 99%

Biomonitoring in a fish farm in the Legal Amazon revealed physiological alterations in Caenorhabditis elegans

Sousa

Medeiros

Silva

et al. 2022

Aquaculture Research

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The aim of this study was to characterize the limnological parameters and analyse the biological effects of different ponds in a commercial fish farm in the Pará State, Brazil. One pond is designated for fingerling production (N) while the other is for fattening and termination (F). The other three ponds are named supply tanks, from which the water from the Parauapebas River is collected to fill N and F tanks. For the physical–chemical analysis, samples from N and F ponds were collected at a depth of 50 cm close to the water's outlets of the ponds, with the aid of a commercial kit for water analysis. Caenorhabditis elegans nematodes were used for water quality biomonitoring and exposed for 24 h to samples from all five tanks collected during three different days, being assessed through physiological endpoints. During the study, values of transparency and pH were higher in N, both with significant differences between the ponds. The other parameters did not show any differences among them in the different days and times analysed. The results showed that the water quality of N and F ponds is in accordance with the current legislation in the country. Despite being in accordance with legislation and with acceptable metal levels, samples caused toxicity to worms, which indicate that for fish production, a continuous supervision is essential for the success of the activity. Therefore, the limnological variables in relation to biomonitoring should be constantly assessed in fish farm enterprises in order to maintain a more efficient and sustainable productive system.

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“…Three blank samples per digestion run were prepared in the same way as the samples and CRMs, resulting in a total of 12 blank samples. Recovery rates for eight CRM samples were within 20% of the certified range (Table 1 ) (Erasmus et al 2020a ; Díaz-Morales et al 2021 ). Each sample (blanks, CRM, and muscle tissue) was analyzed in triplicate where the mean concentration was used, while the percentage relative standard deviation (%RSD) was always less than 10%.…”

Section: Methodsmentioning

confidence: 99%

Element contamination of the Orange-Vaal River basin, South Africa: a One Health approach

Erasmus,

Truter,

Smit

et al. 2024

Environ Sci Pollut Res

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Numerous low-income groups and rural communities depend on fish as an inexpensive protein source worldwide, especially in developing countries. These communities are constantly exposed to various pollutants when they frequently consume polluted fish. The largest river basin in South Africa is the Orange-Vaal River basin, and several anthropogenic impacts, especially gold mining activities and industrial and urban effluents, affect this basin. The Department of Environment, Forestry and Fisheries in South Africa has approved the much-anticipated National Freshwater (Inland) Wild Capture Fisheries Policy in 2021. The aims of this study were (1) to analyze element concentrations in the widely distributed Clarias gariepinus from six sites from the Orange-Vaal River basin and (2) to determine the carcinogenic and non-carcinogenic human health risks associated with fish consumption. The bioaccumulation of eight potentially toxic elements (As, Cd, Cr, Cu, Hg, Ni, Pb, Zn) was assessed in C. gariepinus from sites with different anthropogenic sources. The human health risks were determined to assess the potential risks posed by consuming contaminated C. gariepinus from these sites. Carcinogenic health risks were associated with fish consumption, where it ranged between 21 and 75 out of 10,000 people having the probability to develop cancer from As exposure. The cancer risk between the sites ranged between 1 and 7 out of 10,000 people to developing cancer from Cr exposure. A high probability of adverse non-carcinogenic health risks is expected if the hazard quotient (HQ) is higher than one. The HQ in C. gariepinus from the six sites ranged between 1.5 and 5.6 for As, while for Hg, it was between 1.8 and 5.1. These results highlight the need for monitoring programs of toxic pollutants in major river systems and impoundments in South Africa, especially with the new fisheries policy, as there are possible human health risks associated with the consumption of contaminated fish. Graphical Abstract

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Metal contamination and toxicity of soils and river sediments from the world's largest platinum mining area

Cited by 12 publications

References 48 publications

Role of the rhizosphere bacterial community in assisting phytoremediation in a lead-zinc area

Role of the rhizosphere bacterial community in assisting phytoremediation in a lead-zinc area

Biomonitoring in a fish farm in the Legal Amazon revealed physiological alterations in Caenorhabditis elegans

Element contamination of the Orange-Vaal River basin, South Africa: a One Health approach

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