Article

Heavy metal contamination and accumulation in soil and wild plant species from industrial area of Islamabad, Pakistan

Pakistan Journal of Botany (Impact Factor: 0.82). 01/2010; 42(1):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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    • "MeHg is primarily responsible for bioaccumulation in the muscle tissue of fish with a methyl mercury/total mercury ratio of 83–90% (Kannan et al. 1998;Marsalek et al. 2005;Kruzikova et al. 2008). Lead is known to be carcinogenic to both aquatic biota and humans (Malik et al. 2010), induce renal tumors, reduce cognitive development, and increase blood pressure. Other symptoms of lead toxicity include gastrointestinal disorders and some liver impairment (Gupta et al. 2009). "

    Full-text · Dataset · Jan 2016
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    • "Mean and standard deviation were analyzed in Microsoft Excel.) was slightly to moderately basic. Higher pH values in soil result in greater retention and lower trace metal solubility (Muwanga 1997;Malik et al. 2010;Sekabira et al. 2011) and mobility due to hydroxides precipitation , carbonates or insoluble organic complexes formation (Smith et al. 1996) which may limit trace metal uptake and translocation into shoots. It is well known that metal solubility can be modified by plants, notably through releasing exudates from their root compounds and modifying soil microbial activity (Remon et al. 2005).The correlation analysis is a bivariate method which is applied to describe the relation between two different metals. "
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    ABSTRACT: The presence of trace metals in landfill soil and plants pose a risk to the environment and human health. This study was conducted to determine trace metal concentrations in soil and different plant parts that grow in the Amin Bazar landfill, Bangladesh, to evaluate the possible human health risk on consumer. The collected soil and plant samples were analyzed for trace metals using a Flame Atomic Absorption Spectrophotometer. The mean concentrations of trace metal found in the soil were in the following order: zinc (Zn) > manganese (Mn) > lead (Pb) > copper (Cu) > chromium (Cr) > nickel (Ni). Considering all selected plant species, the mean concentrations of trace metals were in the following order: Zn > Ni > Mn > Cu. On the other hand considering all measured trace metals, the accumulation trend in plant species were in the following order: Carica papaya > Enhydra flactuans > Amaranthus gangeticus > Ipomoea aquatica > Sesbania cannabina > Musa sapientum. Pb and Cr were not accumulated in the studied plant species. Translocation factor (TF), bioaccumulation factor (BAF) and bioaccumulation coefficient (BAC) were calculated for the assessment of mobility of trace metals from root to shoot, soil to shoot and soil to whole plant, respectively. TF values showed that the plant species effectively translocate trace metals from roots to the shoots, suggesting that they are suitable for phytoextraction. According to BAF all studied plants were excluders for all metals except Ni, and according to BAC, all studied plants were hyperaccumulators of Ni. The daily metal intake and health risk index values of the studied metals, except of Ni, indicated that there is a relative absence of health risks associated with the ingestion of contaminated edible parts of plants.
    Full-text · Article · Jan 2016
    • "TF Metal shoot Metal root BAC indicates ratio of Cd in shoots to that in growing media (Malik et al., 2010). "
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    ABSTRACT: Cadmium (Cd) contamination is a serious agricultural and environmental hazard. The study investigates cross-protection roles of putrescine (Put, 0.2 mM) and nitric oxide (sodium nitroprusside; SNP, 1 mM) in conferring Cd (CdCl2, 1.5 mM) tolerance in mung bean (Vigna radiata L. cv. BARI Mung-2) seedlings. Cadmium stress increased root and shoot Cd content, reduced growth, destroyed chlorophyll (chl), modulated proline (Pro) and reduced leaf relative water content (RWC), increased oxidative damage [lipid peroxidation, H2O2 content, generation rate, lipoxygenase (LOX) activity], methylglyoxal (MG) toxicity. Put and/or SNP reduced Cd uptake, increasd phytochelatin (PC) content, reduced oxidative damage enhancing non-enzymatic antioxidants (AsA and GSH) and activities of enzymes [superoxide dismutase (SOD), catalase (CAT), ascorbate peroxidase (APX), dehydroascorbate reductase (DHAR), glutathione reductase (GR), glutathione S-transferase (GST), and glutathione peroxidase (GPX)]. Exogenous Put and/or SNP modulated endogenous polyamines, PAs (putrescine, Put; spermidine, Spd; spermine, Spm), and NO; improved glyoxalase system in detoxifying MG and improved physiology and growth where combined application showed better effects which designates possible crosstalk between NO and PAs to confer Cd-toxicity tolerance.
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