Radial distribution of Ni in stemwood of Quercus ilex L. trees grown on serpentine and sandy loam (umbric leptosol) soils of NE-Portugal

Nabais, Cristina; Freitas, Helena; Hagemeyer, J.; Breckle, Siegmar‐W.

doi:10.1007/bf00011433

Cited by 22 publications

(19 citation statements)

References 15 publications

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“…In an earlier investigation from this laboratory, Nabais et al (1996) determined the Ni concentrations in the main stem of Q. ilex growing on serpentine and sandy loam soils. Nabais et al (1997) quanti®ed the amino acids and carboxylic acids in the xylem sap of Q. ilex and discussed their role in Ni binding and transport.…”

Section: Discussionmentioning

confidence: 99%

Removal of toxic metals from solution by leaf, stem and root phytomass of Quercus ilex L. (holly oak)

Prasad

Freitas

2000

Environmental Pollution

157

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apsule'': Holly oak phytomass was useful as a bio®lter of toxic trace metals. AbstractIncreased consciousness for safeguarding the aqueous environment has prompted a search for alternative technologies for the removal of toxic metal ions from aqueous solutions. In this regard, a wide variety of biomass is being considered as adsorbents of heavy metals for treatment of industrial and domestic wastewaters as well as natural waters, including drinking water. In the present investigation, the potential of Quercus ilex phytomass from stem, leaf and root as an adsorbent of chromium (Cr), nickel (Ni), copper (Cu), cadmium (Cd) and lead (Pb) at ambient temperature was investigated. The metal uptake capacity of the root for different metals was found to be in the order: Ni>Cd>Pb>Cu>Cr; stem Ni>Pb>Cu>Cd>Cr; and leaf Ni>Cd>Cu>Pb>Cr. The highest amount adsorbed was Ni (root>leaf>stem). Data from this laboratory demonstrated that Ni is sequestered mostly in the roots, where concentrations can be as high as 428.4 ng/g dry wt., when 1-year-old seedlings were treated with Ni (2000 mg/l) in pot culture experiments, compared to 7.63 ng/g dry wt., control (garden and greenhouse soil) topsoil where Ni was present in trace amounts. This proves that the root biomass of Q. ilex has the capacity for complexing Ni. Cr exhibited the least adsorption values for all the three types of phytomass compared to other metals. The trend of adsorption of the phytomass was similar for Ni and Cd, i.e. root>leaf>stem. Desorption with 10 mM Na 4 EDTA was eective (55±90%) and, hence, there exists the possibility of recycling the phytomass. The biosorption results of recycled phytomass suggest that the selected adsorbents are re-usable. The advantages and potential of the Q. ilex phytomass as a bio®lter of toxic trace metals, the scope and need for enhancing the eciency of the Q. ilex phytomass as an adsorbent of metals are presented. #

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Section: Discussionmentioning

confidence: 99%

Removal of toxic metals from solution by leaf, stem and root phytomass of Quercus ilex L. (holly oak)

Prasad

Freitas

2000

Environmental Pollution

157

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“…The failure to detect Ni toxicity may arise partly from the high levels of Mg on the soil [1]. However, significant differences between trees growing in nonserpentine and serpentine soils can be found in Ni concentrations in wood and bark (xylem and phloem tissues) with higher values in the latter case [2,3,4].…”

Section: Introductionmentioning

confidence: 99%

Kinetics and Mechanism of Ni(II) Chelation in Model and Real Solutions of Xylem Sap of Quercus ilex

Santos¹,

Alves²,

Gonçalves³

2007

Electroanalysis

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The kinetics of formation and dissociation of Ni(II) complexes with oxalic and citric acids was studied by cyclic voltammetry in model solutions of xylem sap of Q. ilex (the dominant tree growing on serpentine soils of Northeast Portugal) using representative concentrations, pH and ionic strength. The role of magnesium on complex formation was analyzed from solutions where Mg is present at concentration levels found in the xylem sap of Q. ilex growing on both nonserpentine and serpentine soils. Kinetics studies were also done in diluted solutions of real xylem sap samples, spiked with increasing amounts of magnesium. The values obtained for the apparent rate constants were those anticipated by the proposed model. To test the validity of the methodology and mechanisms, formation rate) of Ni(II) complexes with citrate and oxalate were evaluated that compare with the values from Eigen mechanism.

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“…The approach remains controversial, as shown by the comparable number of failed and successful attempts (see reviews by : Hagemeyer, 1993;Watmough, 1997). Several more recent published studies have successfully correlated tree-ring records to historical contamination or mobilization of metals in the soil (e.g., Baes and McLaughlin, 1984;Hagemeyer, 1993;Yanosky and Vroblesky, 1995;Nabais et al, 1996;Smith and Shortle, 1996;Punshon et al, 2003;Devall et al, 2006).…”

Section: Introductionmentioning

confidence: 99%

Arsenic in tree rings at a highly contaminated site

Cheng

Buckley

Katz

et al. 2007

Science of The Total Environment

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Radial distribution of Ni in stemwood of Quercus ilex L. trees grown on serpentine and sandy loam (umbric leptosol) soils of NE-Portugal

Cited by 22 publications

References 15 publications

Removal of toxic metals from solution by leaf, stem and root phytomass of Quercus ilex L. (holly oak)

Removal of toxic metals from solution by leaf, stem and root phytomass of Quercus ilex L. (holly oak)

Kinetics and Mechanism of Ni(II) Chelation in Model and Real Solutions of Xylem Sap of Quercus ilex

Arsenic in tree rings at a highly contaminated site

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