heavy metals Articles
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Amelioration of Mn toxicity by Brassinosteroids in Brassica juncea L.
The effects of 28-homobrassinolide (28-homoBL) on protein content and antioxidative enzyme activities in 7-days old Brassica juncea L. seedlings were studied. The seeds pre-treated with different concentrations of 28-homoBL were germinated in Petriplates supplied with various concentrations of heavy metal (Mn). The activities of superoxide dismutase, catalase, ascorbate peroxidase, guaiacol ...
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Vermicomposting of flyash: a potential hazardous waste converted into nutritive compost by earthworm (Eudrilus eugeniae)
Vermicomposting of fly-ash(FA) mixed with different proportions of Horse dung (HD) T1 – 100% HD alone, T2 – 10% FA + 90% HD, T3 – 20% FA + 80% HD, T4 – 30% FA + 70% HD, T5 – 40% FA + 60% HD and T6 – 50% FA + 50% HD, using Eudrilus eugeniae was done to evaluate the level of heavy metals (Cr,Cd,Pb and Ni) in the vermicasts and tissue and worm biomass. The better worm biomass and maximum reduction ...
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Heavy Metal Accumulation of Edible Vegetables Cultivated in Agricultural Soil in the Suburb of Zhengzhou City, People`s Republic of China
Heavy metals are not biodegradable and can accumulate in human vital organs, producing progressive toxicity. Many researches have revealed the carcinogenic effects of several heavy metals such as cadmium (Cd), chromium (Cr), lead (Pb), mercury (Hg) and arsenic (As) (Trichopoulos 1997; Feig et al. 1994; Gibb and Chen ...
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Effect of composting on sludge contaminated with heavy metals from three different tannery streams and their bioavailability to plants
This research was conducted to study the influence of composting on tannery sludge contaminated by Cr, Cd, Zn, Cu, and Ni. Composting of sludge streams was performed in three different piles for 60 days. The results showed that the total concentration of heavy metals was increased with composting, except in the TT-3 sample where the concentrations of Cd, Cu, and Ni did not increase. The ...
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Biosorption of aquatic copper (II) by mushroom biomass
Pleurotus eryngii : kinetic and isotherm studiesBiosorption is an effective method for removing heavy metals from effluent. This work mainly aimed to evaluate the adsorption performance of the widely cultivated novel mushroom, Pleurotus eryngii, for the removal of Cu(II) from single aqueous solutions. Kinetics and equilibria were obtained using a batch technique. The sorption kinetics follows the pseudo-second-order model, whereas the ...
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Trace element and heavy metal concentrations in fruits and vegetables of the Gediz River region
The Gediz river that irrigates the largest agricultural part of the Aegean Region's "Gediz Plain" is being polluted by industrial and domestic wastes starting from the Murat Mountain and continuing to the river's mouth. To study the pollution status, vegetables (tomato, pepper, bean, purslane, cowpea), fruits (apple, plum, pomegranate, walnut, watermelon, peach, cherry, grape), and leaf samples ...
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Adsorption kinetics and intraparticulate diffusivities of Hg, As and Pb ions on unmodified and thiolated coconut fiber
As, Hg and Pb are examples of heavy metals which are present in different types of industrial effluents responsible for environmental pollution. Their removal is traditionally made by chemical precipitation, ion-exchange and so on. However, this is expensive and not completely feasible to reduce their concentrations to the levels as low as required by the environmental legislation. Biosorption is ...
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Biosorption performance of red and green marine macroalgae for removal of trace cadmium and nickel from wastewater
The ability of red (Corallina officinalis L., Porphyra columbina) and green (Codium fragile) marine macroalgae to remove Cd(II) ions from dilute aqueous solutions, mimicking wastewaters with low metal concentrations, was explored. Under pre-established equilibrium conditions, Corallina and Porphyra attained almost complete removal at 1 g/100 mL. Equilibrium sorption isotherms of cadmium were ...
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Chelant-assisted accumulation of Cd, Cu and Zn in rapeseed (Brassica napus L.) biomass as a renewable energy feedstock.
This article discusses the environmental concerns regarding soil contamination by heavy metals and the possibility of growing a high biomass-yielding crop (i.e., rapeseed) as a tool of phytoremediation. The aim of our research was to investigate the growth parameters and the capacity of rapeseed to accumulate Cd, Cu, and Zn from the contaminated soil and to investigate the effects of the chelants ...
By Biovala
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Accumulation and mobility of heavy metals in fenugreek (Trigonella foenum-graceum L.) and tomato (Lycopersicum esculentum Mill.) grown in the field amended with urban wastes, and their composts and vermicomposts
Accumulation of cadmium (Cd), lead (Pb), zinc (Zn), copper (Cu) and manganese (Mn) in roots, stems and leaves of fenugreek and tomato grown on lateritic soil amended with municipal solid waste, market and floral waste, and their composts and vermicomposts prepared using three earthworm species, were assessed. The heavy metal accumulation in the plant parts showed significant correlations with ...
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Biosorption of heavy metals by utilising onion and garlic wastes
Onion (Allium cepa L.) and garlic (Allium sativum L.) wastes from market and food canning processes were used for adsorption of Pb2+, Sn2+, Fe2+, Hg2+, As3+ and Cd2+ from multi–component systems at different adsorbent/metal ion ratios. The influence of pH, contact time, temperature and the concentration of adsorbent and adsorbate were studied to optimise the conditions to be utilised on a ...
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Influence of nitrogen fertilizer on Cd and Zn accumulation in rapeseed (Brassica napus L.) biomass
Diffuse soil contamination with heavy metals and Cd in particular is a matter of serious concern. Application of conventional remediation methods usually is not feasible due to the large territories and relatively low heavy metal content. Thus, phytoremediation is seen as an alternative. Rapeseed was grown on Cd and Zn contaminated as well as clean soil under the greenhouse conditions. Solid and ...
By Biovala
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Assessment of heavy metal contamination and bioaccumulation in soybean plants from mining and smelting areas of southern Hunan province, China
Soybean is one of most important dicotyledonous food crops and widely planted in Hunan province, China. However, mining activity causes soil contamination in which soybean grows. To assess the impact of mining‐induced soil contamination on soybean plants, a geoaccumulation index (Igeo) was used to evaluate 20 soil samples from the mining areas of southern Hunan province, China. The results ...
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Recycling agriculture wastes of ramie stalk as bioadsorbents for Cd2+ removal: a kinetic and thermodynamic study
In this study, we exhibit the recycling of agriculture wastes of ramie stalk as bioadsorbents for Cd2+ removal. Based on our experimental results, it is realized that Cd2+ adsorption to ramie stalk is highly pH sensitive, indicating the adsorption is driven by surface complexation reaction. The high adsorption capacity of ramie stalk toward Cd2+ (qm = 10.33 mg g−1, 0.09 mol-Cd g−1), which ...
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A statistical approach to evaluate compost genotoxicity
Parallel experiments were carried out to evaluate the induction of genotoxic effects in Vicia faba seedlings treated both with aqueous and organic extracts (dimethyl sulphoxide 5%) of 13 composts, or grown on soil samples to which different doses of the same composts were added. Pearsons linear correlation coefficient and multiple regression were used to study how these two different ...
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Remediation of heavy metals from urban waste by vermicomposting using earthworms: Eudrilus eugeniae, Eisenia fetida and Perionyx excavatus
This study revealed that three earthworm species, viz., Eudrilus eugeniae, Eisenia fetida and Perionyx excavatus, through vermicomposting remediated heavy metals - Pb, Zn, Cd, Cu and Mn from the urban waste - organic fraction of Municipal Solid Waste [M(O)SW], vegetable Market Waste (MW) and Floral Waste (FW). The concentrations of Zn, Cd and Cu were 36.1, 50.9 and 70.2% higher in M(O)SW compared ...
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Towards an understanding of the effect of road pollution on adjacent food crops: Zea mays as an example
This work is a preliminary study to test the hypothesis that major roads can have an adverse effect on the heavy metal composition of soil and food crops. Surface and subsurface soil samples were collected at increasing distances from the major road in the Araxos area and they were analysed for organic C, Al, Pb, Cd, Zn, Cu, Ni, Fe, Mn, Cr, Co, P, Ca, Mg and Na by inductively coupled plasma ...
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Golf course to the rescue
When ARCO was confronted with a costly mining waste cleanup, EH&S officers at the company proposed building a golf course, saving at least $15 million in shareholder dollars. There are examples that can be used to clearly illustrate the savings of tens of millions of taxpayer or corporate dollars by the efforts of small groups of EH&S leaders who reject conventional wisdom. One such ...
By AHC Group
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Uses of winery and distillery effluents in agriculture: characterisation of nutrient and hazardous components
ABSTRACTTwenty-one samples of winery and distillery effluents were collected from different Spanish winery and distillery industries. Electrical conductivity, pH, redox potential, density, organic charge (chemical oxygen demand, biological oxygen demand, total, volatile and suspended solids, oxidisable organic C and polyphenols) and contents of plant nutrients and heavy metals were analysed. The ...
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Chemical and physical properties of rice straw waste and hospital sewage sludge in turned windrow aeration system
In this paper, we present the main goal of optimum quality ratio of co-composting with rice straw waste and hospital sewage sludge. The experiments were designed by varying the initial C/N ratio and moisture content in the range of 25-45 and 30-70% w/w., respectively. The results clearly showed that the losses of Kjeldahl-N increased when the amounts of sludge in the mixtures were increased. The ...
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