Partitioning and speciation of chromium, copper, and arsenic in CCA-contaminated soils: influence of soil composition

Balasoiu, Cristina F; Zagury, Gérald J.; Deschênes, Louise

doi:10.1016/s0048-9697(01)00833-6

Cited by 188 publications

(104 citation statements)

References 34 publications

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“…Although there were considerable variations in the proportions of Cu present in the various fractions, Cu was primarily present in exchangeable, water soluble and Mn -oxide fractions respectively. This is, however, in contrast with other reports where Cu was found to be predominant in the organic fraction (Ramos et al, 1994;Balasoiu, 2001) of the soils, which was low in the present study. The significant correlation coefficients obtained between Zn and Cu in the plant available (0.72) and residual fractions (0.54) respectively suggest that there are sufficient labile and reserved forms of these metals in the wetland soils.…”

Section: Discussioncontrasting

confidence: 99%

Fractionation and bioaccumulation of copper and zinc in wetland soils of the Niger Delta determined by the oil palm

Oviasogie

Aghimien

Ndiokwere

2011

Chemical Speciation & Bioavailability

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The concentration, mobility, bioavailability, distribution and associations of two essential micronutrient elements (copper and zinc) to the oil palm in wetland soils of the Niger delta region of Nigeria was assessed by means of chemical fractionation analysis. The water soluble and plant available fractions were introduced into the sequential extraction scheme. Also assessed were the bioaccumulation (concentration and distribution) of these metals in the leaves and fruits of the oil palm of various ages found around the soil profiles. Copper was obtained more in the amorphous Fe -oxide fraction (151.05 mg kg), but evenly distributed in the exchangeable component (16.16%) with a maximum value of 126.6 mg kg À 1 . The water soluble and plant available fractions had 16.15 and 7.54% distribution of Cu respectively. Zinc had 2.35 and 30.42% distribution in the water soluble and plant available fractions respectively. The lowest mean amount of Cu (1.33 mg kg À 1 ) was determined in the leaves of palms of ages 15 -32 years. Palms greater than 60 years had the highest mean concentration of copper (3.91 mg kg À 1 ) in the leaves while the endosperm (kernel) of palms between 2 and 10 years had concentration of 9.07 mg kg À 1 . The fibrous oily mesocarp had the highest amount (16.78 mg kg À 1 ) of copper in the older palms (460 years). Similarly, Zn was dominant in the older palms with a mean concentration of 187.14 mg kg À 1 obtained in the endosperm (kernel). The bioaccumulation pattern of both metals by the palms irrespective of age and the fractionation analysis revealed sufficient bioavailable and reserved amounts of Zn and Cu in the wetland soils.

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Section: Discussioncontrasting

confidence: 99%

Fractionation and bioaccumulation of copper and zinc in wetland soils of the Niger Delta determined by the oil palm

Oviasogie

Aghimien

Ndiokwere

2011

Chemical Speciation & Bioavailability

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“…In general, trivalent arsemc is of increased environmental concem relative to As(V) compounds because it is more mobile (20,27 (26). Since this metal is organicaIly complexed, the best way to release this fraction is to oxidize the organic matter.…”

Section: 1 the Heavy Metal Fractions In Soilmentioning

confidence: 99%

Recycling of complexometric extractants to remediate a soil contaminated with heavy metals

Lee

Marshall

2002

J. Environ. Monitor.

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Equilibrations were performed with complexing reagent(s) to mobilise Cd, Cu, Mn, Ni, Pb and Zn from a contaminated urban soil. The metal-laden aqueous extract was treated with zero-valent magnesium (Mg 0 ) or bimetallic mixture (Pd 0 /Mg 0 or Ag 0 /Mg 0 ) to precipitate the heavy metals from solution while liberating the chelating reagent(s). Post precipitation, the pH of aqueous supernatant fraction was readjusted to y5 and the solution was re-combined with the soil particulates to extract more heavy metal pollutants. A sparing quantity of EDTA (10 mmoles) mobilised 32-54% of the 5 mmoles of heavy-metals from the soil with three cycles but only 0.1% of the iron was removed. Three successive extractions with a mixture of complexing reagents (3 mmoles), 1 : 1 EDTA plus HEDC [bis-(2-hydroxyethyl)-dithiocarbamate], mobilised y49% of the Pb, y18% of the Zn and y19% of the Mn burden but only 7% of the Cu, and 1% of the Fe from this soil. An appreciable fraction of the mobilised Pb and Cu and a portion of the Zn was cemented to the surfaces of the excess magnesium whereas virtually all of the Fe and Mn was removed from solution as insoluble hydroxides.

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“…Therefore, the adsorption-desorption in the soil was very complicated, and the changes in the MMA, DMA, and As(V) concentrations in the soil extracts were the combined effects of speciation transformation and adsorption-desorption. Although no speciation transformation of exogenously added As(V) in soil was found (Figure 3a), it could occur when the environmental conditions are correct (Yan et al 2000, Balasoiu et al 2001. Therefore, it is necessary to take As speciation transformation into account when studying the adsorption-desorption of As in the future.…”

Section: Resultsmentioning

confidence: 99%

The arsenic speciation transformation in artificially arsenic-contaminated fluvo-aquic soil (Beijing, China)

Zeng¹,

He²,

Bai³

et al. 2011

PLANT SOIL ENVIRON

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Arsenic (As) speciation transformation often accompanies adsorption-desorption when exogenous arsenide is poured into soil. Disregarding the speciation transformation when evaluating adsorption-desorption of As can greatly influence the experimental results. In this study, batch experiments were conducted, and the results indicated that exogenous monomethylarsonic acid (MMA) or dimethylarsinic acid (DMA) added to fluvo-aquic soil collected from agricultural area in Beijing of China, was completely converted into As(V) after cultivated for 60 or 90 days. However, when exogenous As(V) was added to the soil, no speciation transformation of As(V) was observed. Furthermore, although the total As concentration, which was 6.55 or 11.55 mg/kg in aqueous extracts of the soil to which MMA or DMA had been added, respectively, remained stable after cultivated for 30 or 60 days, the As speciation transformation of MMA or DMA into As(V) in soil still occurred. Differences in As speciation can result in different fates and behaviors of As in soil, and As speciation transformation should be taken into account when evaluating the adsorption-desorption of As.

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Partitioning and speciation of chromium, copper, and arsenic in CCA-contaminated soils: influence of soil composition

Cited by 188 publications

References 34 publications

Fractionation and bioaccumulation of copper and zinc in wetland soils of the Niger Delta determined by the oil palm

Fractionation and bioaccumulation of copper and zinc in wetland soils of the Niger Delta determined by the oil palm

Recycling of complexometric extractants to remediate a soil contaminated with heavy metals

The arsenic speciation transformation in artificially arsenic-contaminated fluvo-aquic soil (Beijing, China)

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