Oral bioaccessibility of metal(loid)s in dust materials from mining areas of northern Namibia

Ettler, Vojtěch; Cihlová, Markéta; Jarošíková, Alice; Mihaljevič, Martin; Drahota, Petr; Křı́bek, Bohdan; Vaněk, Aleš; Penížek, Vít; Šráček, Ondra; Klementová, Mariana; Engel, Zbyněk; Kamona, Fred; Mapani, Benjamin

doi:10.1016/j.envint.2018.12.027

Cited by 49 publications

(16 citation statements)

References 57 publications

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“…The approach is based on Karadaş and Kara (2011) and Ettler et al (2012), in which the TDI is calculated using the human-toxicity maximum permissible levels of Baars et al (2001), based on oral exposure for children and adults. The TDI is compared in a scenario of ingesting 100 mg/day of mine waste (e.g., as a result of hand-to-mouth behavior of children playing in the area, swallowing the particles after being cleared from the airways by the mucociliary escalator (Ettler et al, 2019;Kastury et al, 2018), consumption of contaminated plants or water, etc.) (Table 7).…”

Section: Implications For Health and Environmentmentioning

confidence: 99%

“…Additionally, there are several recent studies on the associated human health risks which determine the bioaccessibility of elements in relation to the tolerance levels of humans (Bagherifam et al, 2019;Ettler et al, 2019;Kastury et al, 2017). At low concentrations, some metal(loid)s are essential for living organisms; however, above certain concentrations, all metal(loid)s can have adverse effects on human health (Poggio et al, 2009).…”

Section: Introductionmentioning

confidence: 99%

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Trace elements leaching from Pb Zn mine waste (Plombières, Belgium) and environmental implications

Helser

Cappuyns

2021

Journal of Geochemical Exploration

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The geochemical and mineralogical characterization of mine waste provides essential information to understand the environmental and health impacts and to adequately manage present and historical mine waste sites. In the present study, mine waste samples from a former Zn-Pb mining site were subjected to different types of leaching tests, an in-vitro bioaccessibility test, and a mineralogical analysis. The samples were characterized by elevated pseudo-total Pb (up to 51,800 mg/kg), Zn (up to 60,100 mg/kg), Cd (up to 430 mg/kg), and As (up 3,170 mg/kg) concentrations, and contained, among other minerals, cerussite (PbCO 3 ) and galena (PbS). Lead is not only present in abundant concentrations, but also in highly bioaccessible forms, as determined from the in-vitro bioaccessibility test. This indicates the high risks

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Section: Implications For Health and Environmentmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Trace elements leaching from Pb Zn mine waste (Plombières, Belgium) and environmental implications

Helser

Cappuyns

2021

Journal of Geochemical Exploration

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“…Toxic heavy metals in contaminants can be slowly released by weathering and thereby co-precipitate metals as hydroxides and the occurrence of oxides of metals, such as Fe, Ti and Mn. Fe-bearing mineral phases are transformed into secondary metals species by the redox potential of the soil environment, Fe oxide is present in various forms such as hydrous oxides (e.g., ferrihydrite, hydrohematite, and maghemite), and oxyhydroxides (e.g., goethite, lepidocrocite, and feroxyhyte) [ 11 , 12 , 13 ]. In addition, the Fe oxide phase plays a key role in the amorphous toxic heavy metals sorption process because of their reactivity, surface area, and surface charge.…”

Section: Introductionmentioning

confidence: 99%

Remediation of Toxic Heavy Metal Contaminated Soil by Combining a Washing Ejector Based on Hydrodynamic Cavitation and Soil Washing Process

Kim

Cho

Purev

et al. 2022

IJERPH

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Based on the features of hydrodynamic cavitation, in this study, we developed a washing ejector that utilizes a high-pressure water jet. The cavitating flow was utilized to remove fine particles from contaminated soil. The volume of the contaminants and total metal concentration could be correlated to the fine-particle distribution in the contaminated soil. These particles can combine with a variety of pollutants. In this study, physical separation and soil washing as a two-step soil remediation strategy were performed to remediate contaminated soils from the smelter. A washing ejector was employed for physical separation, whereas phosphoric acid was used as the washing agent. The particles containing toxic heavy metals were composed of metal phase encapsulated in phyllosilicates, and metal phase weakly bound to phyllosilicate surfaces. The washing ejector involves the removal of fine particles bound to coarse particles and the dispersion of soil aggregates. From these results we determined that physical separation using a washing ejector was effective for the treatment of contaminated soil. Phosphoric acid (H3PO4) was effective in extracting arsenic from contaminated soil in which arsenic was associated with amorphous iron oxides. Thus, the obtained results can provide useful information and technical support for field soil washing for the remediation of soil contaminated by toxic heavy metals through emissions from the mining and ore processing industries.

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“…The emission of fine dust particles from the smelting of non-ferrous metals is a notable environmental issue [1,2]. These contaminants are fine (<2 µm) or ultrafine (<0.5 µm) particles that mainly include slag fragments and un-melted ore [3]. Furthermore, fine dust particles pollute surface soils based on the direction of the wind and negatively affect the health of local populations [4,5].…”

Section: Introductionmentioning

confidence: 99%

Physical Separation of Contaminated Soil Using a Washing Ejector Based on Hydrodynamic Cavitation

et al. 2021

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A washing ejector is a pre-treatment technology used to remediate contaminated soil by separating fine particles. The washing ejector developed in this study is a device that utilizes fast liquid jets to disperse soil aggregates by cavitation flow. The cavitation phenomenon is affected by the Bernoulli principle, and the liquid pressure decreases with the increase in kinetic energy. The cavitating flow of the fluid through the Ventrui nozzle can remove surface functional groups and discrete particles. The main methodology involves the removal of small particles bound to coarse particles and the dispersion of soil aggregates. Particle collisions occur on the surface soil, such as the metal phase that is weakly bound to silicate minerals. It was observed that the dispersed soil affected the binding of toxic heavy metals and the mineralogical characteristics of the soil. The quantity of oxides, organic matter, and clay minerals affected the properties of the soil. An almost 40–60% removal efficiency of total metals (As, Zn, and Pb) was obtained from the contaminated soils. After treatment by a washing ejector, the volume of fine particles was reduced by 28–47%. When the contaminants are associated with particulates, separation using a washing ejector can be more effective. Therefore, physical separation improves the removal efficiency of heavy metals from soil aggregates.

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Oral bioaccessibility of metal(loid)s in dust materials from mining areas of northern Namibia

Cited by 49 publications

References 57 publications

Trace elements leaching from Pb Zn mine waste (Plombières, Belgium) and environmental implications

Trace elements leaching from Pb Zn mine waste (Plombières, Belgium) and environmental implications

Remediation of Toxic Heavy Metal Contaminated Soil by Combining a Washing Ejector Based on Hydrodynamic Cavitation and Soil Washing Process

Physical Separation of Contaminated Soil Using a Washing Ejector Based on Hydrodynamic Cavitation

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