Pakistan Journal of Botany 01/2010; 42:291-301.

ABSTRACT This study was designed to assess total contents of 6 toxic metals viz., Pb, Cu, Zn, Co, Ni, and Cr in the soil and plant samples of 16 plant species collected from industrial zone of Islamabad, Pakistan. The concentration, transfer and accumulation of metals from soil to roots and shoots was evaluated in terms of Biological Concentration Factor (BCF), Translocation Factor (TF) and Bioaccumulation Coefficient (BAC). Total metal concentrations of Pb, Zn, Cu, Co, Ni, and Cr in soils varied between 2.0-29.0, 61.9-172.6, 8.9 to 357.4, 7.3-24.7, 41.4-59.3, and 40.2-927.2 mg/kg. Total metal concentrations pattern in roots were: Cu>Cr>Zn>Ni>Pb>Co. Grasses showed relatively higher total Zn concentration. Accumulation of Cu was highest in shoots followed by Zn, Cr, Pb, Co and Ni. None of plant species were identified as hyperaccumulator; however, based on BCFs, TFs, and BACs values, most of the studied species have potential for phytostabilization and phytoextraction. Parthenium hysterophoirus L., and Amaranthus viridis L., is suggested for phytoextraction of Pb and Ni, whereas, Partulaca oleracea L., Brachiaria reptans (L.) Gard. & Hubb., Solanum nigrum L., and Xanthium stromarium L., for phytostabilization of soils contaminated with Pb and Cu.

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    ABSTRACT: Environmental biotechnology refers to the use of microorganisms to improve the environmental quality and so far it has focused on the development of technologies to clean up the aquatic, terrestrial and aerial environment. This article is an overview of environmental applications of biotechnology. Environmental remediation, pollution prevention, detection and monitoring with regard to the achievements are among the perspectives in the development of biotechnology. A variety of relevant topics have been chosen to illustrate each of the main areas of environmental biotechnology: wastewater treatment, soil treatment and treatment of gaseous pollutants, using microbiological processes. The distinct role of environmental biotechnology in the future would be to contribute with new solutions and directions in the remediation of polluted environments, to minimize future waste release, and to create pollution prevention alternatives.
    International Journal of Farming and Allied Sciences. 12/2014; 3(12):1319-1325.
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    ABSTRACT: The presence of Psidium guajava in polluted environments has been reported in recent studies, suggesting that this species has a high tolerance to the metal stress. The present study aims at a physiological characterization of P. guajava response to high nickel (Ni) concentrations in the root-zone. Three hydroponic experiments were carried out to characterize the effects of toxic Ni concentrations on morphological and physiological parameters of P. guajava, focusing on Ni-induced damages at the root-level and root ion fluxes. With up to 300 μM NiSO4 in the root-zone, plant growth was similar to that in control plants, whereas at concentrations higher than 1000 μM NiSO4 there was a progressive decline in plant growth and leaf gas exchange parameters; this occurred despite, at all considered concentrations, plants limited Ni2+ translocation to the shoot, therefore avoiding shoot Ni2+ toxicity symptoms. Maintenance of plant growth with 300 μM Ni2+ was associated with the ability to retain K+ in the roots meanwhile 1000 and 3000 μM NiSO4 led to substantial K+ losses. In this study, root responses mirror all plant performances suggesting a direct link between root functionality and Ni2+ tolerance mechanisms and plant survival. Considering that Ni was mainly accumulated in the root system, the potential use of P. guajava for Ni2+ phytoextraction in metal-polluted soils is limited; nevertheless, the observed physiological changes indicate a good Ni2+ tolerance up to 300 μM NiSO4 suggesting a potential role for the phytostabilization of polluted soils.
    Journal of Plant Physiology 11/2014; · 2.77 Impact Factor
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    ABSTRACT: In this study, the stabilization treatment efficiency of coal mine drainage sludge (CMDS), waste cow bone (WCB) and waste oyster shell (WOS), which mainly contain -FeOOH and , and CaO, respectively, was estimated for ordinary and paddy fields contaminated with arsenic, lead and other heavy metals. After mixing the contaminated soils completely with stabilization materials, the samples were preserved with moisture for 28 days. The extraction of As, Pb, Cu, Zn and Cd for ordinary soils stabilized by CMDS(wt. 15%) and WOS(wt. 5%) were 5.1, 0.12, 0.33, 2.28 and 0.25 mg/kg, respectively, satisfying the concerned limit for 'Ga' region established by the Ministry of Environment at 2009. The extracted arsenic concentrations of paddy soils stabilized by CMDS(wt. 20%), CMDS(wt. 10%)/WOS(wt. 5%), CMDS(wt. 15%)/WOS(wt. 5%), and CMDS(wt. 10%)/WOS(wt. 10%) were 1.6, 3.52, 2.2 and 2.42 mg/kg, respectively. These results also satisfied the concerned limit for 'Ga' region.
    Journal of Korean Society of Hazard Mitigation. 04/2012; 12(2).


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