Mobility and speciation of heavy metals in soils impacted by hazardous waste

Ogundiran, Mary B.; Osibanjo, Oladele

doi:10.3184/095422909x449481

Cited by 83 publications

(50 citation statements)

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“…In general, the proportions of residual heavy metals decreased with the increase of total heavy metal contents (Figures 2 and 3). This is similar to the previous results (Li and Thornton, 2001;Chaudhary and Banerjee, 2004;Ogundiran and Osibanjo, 2009;Luo et al, 2012b) Cd and Pb are known to be preferentially associated with carbonate minerals, due to their similar size to the Ca ion (Rimstidt et al, 1998), thus a substantial proportion of Cd and Pb in various soils is usually associated with carbonates in the soils (Han and Banin, 1997;Maskall and Thornton, 1997;Faiga et al, 2011;Hu et al, 2011). On the other hand, soil organic matter fixes Cu very strongly (Bloom, 1981), thus a substantial proportion of Cu in various soils is often associated with soil organic matter (Han and Banin, 1997;Mehra et al, 1999;Lin et al, 2008b;Osakwe et al, 2012).…”

Section: Chemical Forms Of Heavy Metals In the Soilsupporting

confidence: 93%

Concentrations and chemical forms of heavy metals in agricultural soil near the world’s largest and oldest tungsten mine located in China

Shao

Cheng

Duan

et al. 2013

Chemical Speciation & Bioavailability

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Tungsten (W) mining has taken place in Ganzhou in China for about 100 years. Such long-term W mining may release large amount of metals to soils and waters around these mines. Twenty soil samples were taken from the area around the W mines and 10 soil samples from an area much farther away. These soil samples were analysed for physicochemical properties, heavy metal content and their chemical forms. Results show that long-term W mining significantly increased both total and labile contents of Cd, Cu, Pb and Zn, but did not, or only slightly, increased the total content of Co, Cr and Ni in the soil near the mine. Average enrichment factor (EF) in the agricultural soils was 4.0, 2.4, 2.2, and 2.0 for Cd, Cu, Pb and Zn, respectively. The labile fraction was dominated by the carbonate-bound fraction for Cd (54.5%) and organic matter-bound fraction for Cu (37.9%), while the major labile fractions for Pb and Zn were associated with carbonates (30.2% and 6.4%), oxides (17.9% and 10.6%) and organic matter (9.2% and 18.8%). Consequently, there is a need to be cautious about Cd in the soils contaminated by W mining.

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Section: Chemical Forms Of Heavy Metals In the Soilsupporting

confidence: 93%

Concentrations and chemical forms of heavy metals in agricultural soil near the world’s largest and oldest tungsten mine located in China

Shao

Cheng

Duan

et al. 2013

Chemical Speciation & Bioavailability

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show abstract

“…This is consistent with the findings of Ramos et al, (1994); Ogundiran and Osibanjo, (2009);Iwegbue et al, (2011);Liang et al, (2014). Studies have shown that cadmium compounds in soil solution are relatively soluble, therefore, its high amount in this fraction implies a high ecological risk (Jamnika et al, 2013).…”

Section: Cadmiumsupporting

confidence: 89%

Trace metals distribution in different geochemical phases of soils around automobile junk markets in southern Nigeria

Osakwe¹

2018

Ife Journal of Science

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Chemical forms of some trace metals in soils around some selected automobile junk markets were studied using five step sequential extraction procedure. The results revealed that nickel, chromium and iron were of lithogenic origin while copper, lead, manganese and cadmium were from anthropogenic sources. The residual fraction was the most important phase for nickel, chromium and iron with the average amounts of 20.38%, 29.93% and 31.09% respectively. Copper and lead were mainly associated with the organic fraction having the average amounts of 24.06% and 22.89% respectively. Manganese predominated in Iron-Manganese oxide phase with an average amount of 23.76% while cadmium existed mainly in the exchangeable phase with an average amount of 30.36%. These results suggest that nickel, chromium and iron cannot be mobilized while cadmium is the most mobile and is easily available for plant uptake. Lead, manganese and copper are relatively stable but may become mobile if there are changes in soil pH or redox potential. The amounts of the metals in the non exchangeable phases were generally high but with relative high mobility factor values obtained for all the metals, changes in the soils physicochemical conditions may lead to remobilization of the metals and they may become bioavailable to plants and may enter food chain which implies a contamination risk for the metals.

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“…This indicates that Ni is largely controlled by parent materials (Turner and Maynard, 2003;Moral et al, 2005). Several studies have reported that nickel mostly occur in residual form (Ryan et al, 2002;Zauyah et al, 2004;Moral et al, 2005;Iwegbue, 2007;Iwegbue et al, 2007a,b;Iwegbue et al, 2009b;Ogundiran and Osibanjo, 2009). However, at heavily impacted sites, the Fe -Mn oxides occluded nickel showed predominance over residual fraction.…”

Section: Nickelmentioning

confidence: 98%

Assessment of heavy metal speciation in soils impacted with crude oil in the Niger Delta, Nigeria

Iwegbue

2011

Chemical Speciation & Bioavailability

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Chemical fractionation of Cd, Cu, Pb, Ni, Cr, Zn and Mn in soils that had received a significant impact of crude oil spillage in the Niger Delta, Nigeria was studied using a sequential chemical extraction method. The results revealed that significant amounts of the metals (Cd, Cu, Pb, Ni, Cr, Zn and Mn) were found in the most labile fractions as compared to the control site. On average, Ni, Cr and Zn were mostly associated with the residual fraction; Pb and Mn with the Fe -Mn oxides; Cu with the organic fraction and Cd with the exchangeable fraction. Among the non-residual fractions, metals were mostly associated with the Fe -Mn oxides fraction. The mobility factors of these metals were higher at the impacted sites as compared with the control site. High mobility of the metals in the impacted soils was associated with the oil spillage, since exogenous metals are usually weakly bound to soil particles. The mobility factors for the metals follow the order: Cd4Zn4Pb4Ni4Mn4Cu4Cr.

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Mobility and speciation of heavy metals in soils impacted by hazardous waste

Cited by 83 publications

References 1 publication

Concentrations and chemical forms of heavy metals in agricultural soil near the world’s largest and oldest tungsten mine located in China

Concentrations and chemical forms of heavy metals in agricultural soil near the world’s largest and oldest tungsten mine located in China

Trace metals distribution in different geochemical phases of soils around automobile junk markets in southern Nigeria

Assessment of heavy metal speciation in soils impacted with crude oil in the Niger Delta, Nigeria

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