Assessment of agricultural soil contamination by potentially toxic metals dispersed from improperly disposed tailings, Kombat mine, Namibia

Mileusnić, Marta; Mapani, Benjamin; Kamona, A.F.; Ružičić, Stanko; Mapaure, Isaac; Chimwamurombe, Percy

doi:10.1016/j.gexplo.2014.01.009

Cited by 85 publications

(29 citation statements)

References 25 publications

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“…Fractionation of agricultural soils close to mines and smelters showed that Pb was in the reducible fraction; Cd in the exchangeable and carbonate fraction while Cu and Zn were mainly in the residual fraction [23]. The reducible fraction was the largest fraction for Cu and Pb in agricultural soils contaminated from improper disposal of tailings [24].…”

Section: Fractionation Of Heavy Metal (Loid)s In Agricultural Soils;mentioning

confidence: 96%

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Metal (Loid)s in Farmland Soils and Strategies to Reduce Bioavailability

Fayiga¹,

Nwoke²

2017

Open J Environ Biol

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High concentrations of heavy metal (loid)s (HMs) in farmland soils reduces crop yield and contaminates the food chain. Exposure to HMs in the diet results in several adverse health effects such as cancer, reproductive health problems and cardiovascular diseases. Understanding the origin and fractionation of these toxic substances will provide direction for reducing their bioavailability in contaminated farmland soils. HMs are added to farmland soils through activities such as irrigation, organic and inorganic fertilization, pest control, and mining. Weathering of parent material and atmospheric deposition can also increase the levels of HMs in the soil. Fractionation of HM contaminated soils provides information on availability of HMs such as Pb, Cd, As, Cr and Cu to soil biota and plants. Several studies have reported that Pb is mostly associated with Fe and manganese oxides (reducible fraction) while Cd is mostly associated with the most mobile fraction (exchangeable fraction). The application of organic and inorganic soil amendments such as vermiculite, zeolite, composts and crop residue to contaminated farmland soils converts HMs from the plant available fractions to the less mobile fractions. HM resistant microbes can change HMs to a less mobile fraction or less mobile oxidation state. The combination of HM resistant microbes, HM tolerant plants, and soil amendments can be used to reduce mobility of HMs in contaminated farmlands. Capsule:The mobility of heavy metal (loid)s in polluted farmland soils depends strongly on its association with soil components.

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Section: Fractionation Of Heavy Metal (Loid)s In Agricultural Soils;mentioning

confidence: 96%

“…The mining of HMs often lead to contamination of nearby agricultural soils [24]. For example, mining activities in Tunisia has led to high concentrations of Pb (17,229 mg kg −1 ), Zn (4813 mg kg −1 ) and Cd (42 mg kg −1 ) in nearby agricultural soils [3].…”

Section: Sourcesmentioning

confidence: 99%

Metal (Loid)s in Farmland Soils and Strategies to Reduce Bioavailability

Fayiga¹,

Nwoke²

2017

Open J Environ Biol

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“…We can also see significant correlations between trace elements in the ore and tailing samples (As/Cd [r = 0.731], As/Cu [r = 0.871], As/Pb [r = 0.923], and As/Zn [r = 0.814]). This indicated a common origin of trace elements (Mileusnić et al, 2014). Precautions ought to be taken because As and HM levels in soil may be hazardous, which has unfavourable implications for agriculture and also for human health via the food chain.…”

Section: Arsenic and Trace Element Contents In Soilmentioning

confidence: 99%

Artisanal gold‐mining in a rural environment: Land degradation in Kenya

Odumo

Nanos²,

Carbonell³

et al. 2018

Land Degrad Dev

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Artisanal gold‐mining (AGM) is one of the most important activities in the districts of Migori and Transmara (Kenya). Gold‐mining, however, is known to release vast quantities of arsenic and metals (some of which are very toxic like As, Hg, Cd, or Pb), which poses a serious threat to not only miners but also to the ecosystem and local populations. We, herein, determine the concentrations of arsenic and some heavy metals in several sample types (i.e., ore, soil, river sediment, and mine tailing) collected from the districts of Migori and Transmara. We also employ lichens and mosses as pollution bioindicators. Geostatistical tools and canonical correlation analysis were used to identify the relevant factors that affected arsenic and metal concentrations in the analysed samples. The following concentration ranges were reported in topsoil: As (1–17,250 mg kg−1), Cd (0.01–15.10 mg kg−1), Cu (7–9,238 mg kg−1), Cr (1–214 mg kg−1), Ni (5–766 mg kg−1), Pb (3–1,149 mg kg−1), and Zn (22–1,271 mg kg−1). It was concluded that the ecosystem in both districts was highly polluted by heavy metals whereas the arsenic concentrations in topsoil were among the highest reported worldwide. The results of this study provide new evidence on the impact of AGM on the environment and may further contribute to the design of policy measures with the aim of reducing environmental and human health risks associated to AGM activities.

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“…There is more concern regarding the environmental effects of mine tailing sites because the tailings produced during ore processing are characterized by elevated levels of potentially toxic metals that can be released into the environment by erosion and leaching processes [1][2][3]. In most cases, mining areas show high concentrations of hazardous elements in surface waters, groundwaters, and soils and these may represent important geochemical risks to human health and the environment [4,5]. For example, As contained in water, soils, or food products may quickly enter the human body, and chronic As exposure causes gastrointestinal disorders, various types of cancer, hypertension, and cardiovascular disease [6].…”

Section: Introductionmentioning

confidence: 99%

Risk Assessment of Contamination by Potentially Toxic Metals: A Case Study in the Vicinity of an Abandoned Pyrite Mine

Zhou

Xue

et al. 2019

Minerals

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Abandoned mining areas can display soil and water pollution and also a high incidence of endemic diseases. Here, based on preliminary results on mental retardation and high incidence rates of cancers, we investigate the contamination status and potential ecological risk at an abandoned pyrite mine located in Xianju village, Hubei province, central China. The study focused on the three potentially toxic metals As, Pb, and Zn and four other common elements, including Ca, Fe, S, and Se. Soil samples were collected from 12 sites and leachate seeping from five sites. Leachates were strongly acidic compared to the soil, with pH values <3.22. Soil As and Se concentrations exceeded the Chinese Grade II standards for soil environmental quality (GB 15618-2009) (30 and 3 mg·kg −1 , respectively), ranging from 33.6 ± 0.7 to 78.2 ± 1.0 mg As·kg −1 dry matter (DM) and 5.3 ± 0.8 to 17.1 ± 1.4 mg Se·kg −1 DM. Arsenic, Fe, Se, and S in leachates all exceeded the Chinese Grade III standard for surface water environmental quality (GB 3838-2002) (0.1, 0.3, 0.03, and 1.0 mg·L −1 ). The potential ecological risks from Pb and Zn in soils were low, but As in soils and leachates represented a moderate or strong risk to children according to the Nemerow index and hazard quotient. Soil replacement combined with further remediation measures is required to remediate the contaminated area.

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Assessment of agricultural soil contamination by potentially toxic metals dispersed from improperly disposed tailings, Kombat mine, Namibia

Cited by 85 publications

References 25 publications

Metal (Loid)s in Farmland Soils and Strategies to Reduce Bioavailability

Metal (Loid)s in Farmland Soils and Strategies to Reduce Bioavailability

Artisanal gold‐mining in a rural environment: Land degradation in Kenya

Risk Assessment of Contamination by Potentially Toxic Metals: A Case Study in the Vicinity of an Abandoned Pyrite Mine

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