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    Wyświetlanie 1-10 z 10
    Tytuł:
    Kinetic studies for the biosorption of chromium using cherry leaves (Muntingia calabura L.)
    Autorzy:
    Aathithya, R.
    Sowparnika, J.R.
    Balakrishnan, V.
    Powiązania:
    https://bibliotekanauki.pl/articles/10873.pdf
    Data publikacji:
    2014
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    kinetics
    biosorption
    chromium
    cherry
    leaf
    Muntingia calabura
    Opis:
    Biosorption is an attractive technology which is used for the sorption of substances by a biomaterial. In this present work the heavy metal chromium was subjected to biosorption because of their non-degradability nature and causes water and land pollution. Cherry leaves were used as a biomaterial for the biosorption. Kinetic studies were performed for the biosorption experiment. From the experiment it was found that the reaction follows pseudo first order reaction because of the larger value of regression coefficient R2 and lower value of standard errors (χ2) for pseudo first order reaction than second order reaction.
    Źródło:
    International Letters of Natural Sciences; 2014, 20
    2300-9675
    Pojawia się w:
    International Letters of Natural Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Chromium induced changes in Soybean (Glycine max L.) metabolism
    Autorzy:
    Sundarmoorthy, P.
    Sankarganesh, K.
    Selvaraj, M.
    Baskaran, L.
    Chidambaram, Al. A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1193974.pdf
    Data publikacji:
    2015
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    Chromium
    biochemical contents
    enzymatic activities
    morphology
    soybean seedlings
    Opis:
    Pulses play an important role in Indian agriculture. Among the pulses, soybean (Glycine max. L) occupies a unique place by becoming the largest source of vegetable oil and protein. It is widely cultivated in India and occupy 5th largest production of soybean in the world. Industrialization and population explosion has caused a serious problem of pollution in the environment in all possible ways. As a result, most of the water resources are getting polluted by receiving large quantity of sewages and industrial wastewaters with heavy metals. In some places, these polluted water is being used for irrigation due to scarcity for good water. The continuous use of these wastewater containing heavy metals degraded the soil quality and reduced the growth and yield performance of agricultural crops. Aresenic, cadmium, chromium, cobalt, copper, lead, mercury, nickel, uranium, vanadium and zinc are the some of the important heavy metals found in our environment. Among the heavy metals, chromium merits a special reference for its toxic potential. It is released from the industries such as electroplating, leather tanning, textile printing and metal finishing. It is one of the main constitutions of tannery effluent. Presence of excess amount of chromium in the wastewater affect the plant growth and development when it is used for irrigation. So, Laboratory study was carried to investigate the irrigational impact of various concentrations of Cr (5, 10, 25, 50 100, 200 and 300 µg/l) on changes in morphological (germination percentage, root length, shoot length, fresh weight and dry weight), photosynthetic pigments (chlorophyll a, chlorophyll b, total chlorophyll, carotenoid) biomolecules (aminoacid, protein, sugar, proline) and antioxidant enzymatic activities (catalase, peroxidase, polyphenol oxidase and super oxide dismutase) were estimated. The accumulation of chromium in soybean seedlings were estimated and they were correlated with the above mentioned parameters.
    Źródło:
    World Scientific News; 2015, 16; 125-158
    2392-2192
    Pojawia się w:
    World Scientific News
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Evaluation of thermodynamic properties for the biosorption of chromium by using cherry leaves (Muntingia calabura L.)
    Autorzy:
    Aathithya, R.
    Sowparnika, J.R.
    Balakrishnan, V.
    Powiązania:
    https://bibliotekanauki.pl/articles/11897.pdf
    Data publikacji:
    2014
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    thermodynamic property
    biosorption
    chromium
    cherry
    leaf
    Muntingia calabura
    entropy
    Opis:
    Chromium is a heavy metal which has widely used in tannery and electroplating industries. Contaminations of these industrial metals into the river possess major threat to an environment. Therefore, biosorption is a technique which is applied for the sorption of heavy metal by a biomaterial. In the present study reveals that cherry leaves was used as a biomaterial and for that the thermodynamic properties was evaluated for the biosorption of chromium. From the thermodynamic studies it was found that the reaction was feasible, spontaneous and exothermic because the values of ΔG = negative, ΔS = negative and ΔH = positive. So, it was concluded that the experiment was thermodynamically feasible.
    Źródło:
    International Letters of Natural Sciences; 2014, 20
    2300-9675
    Pojawia się w:
    International Letters of Natural Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Short-term Impact of Chromium on Erythrocytic Profiles of Channa punctata (Bloch, 1793)
    Autorzy:
    Gupta, Samudra
    Saha, Jaysmita
    Hazra, Swagata
    Ghosh, Rajarshi
    Powiązania:
    https://bibliotekanauki.pl/articles/1193630.pdf
    Data publikacji:
    2017
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    Channa punctata
    Labeo rohita
    chromium
    erythrocytic parameters
    heavy metals
    Opis:
    The tannery industries add chromium as one of the heavy metals to the aquatic environment and tannery waste waters continue to cause negative effects on the aquatic fauna. In the present study, the erythrocytic alterations produced on short-term exposure to sub-lethal concentration of chromium (20 mg/L) were investigated in fresh water air-breathing fish, Channa punctata (Bloch, 1793) for 24h, 48h and 72h respectively. The 96h LC50 of chromium salt, potassium dichromate was determined to be 33.125 mg/L. The results revealed statistically significant decrease in Total Erythrocytic Count (TEC), Haemoglobin (Hb) and Haematocrit (Hct %) in all experimental animals when compared to the control with an increase in exposure periods. The absolute corpuscular values like Mean Cell Haemoglobin (MCH) and Mean Cell Haemoglobin Concentration (MCHC) also exhibited significant increase in fishes of experimental groups. However, the Mean Cell Volume (MCV) contrarily exhibited a fluctuating pattern. The depression of erythrocytic parameters clearly indicates that the fishes have become anaemic due to sublethal exposure of chromium.
    Źródło:
    World Scientific News; 2017, 71; 144-149
    2392-2192
    Pojawia się w:
    World Scientific News
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Removal of chromium by biosorption method (chitosan)
    Autorzy:
    Abatneh, Y.
    Sahu, O.
    Powiązania:
    https://bibliotekanauki.pl/articles/11428.pdf
    Data publikacji:
    2014
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    removal
    chromium
    biosorption
    chitosan
    absorbent
    polymer
    water
    rheological measurement
    Opis:
    Discharge of metal containing effluents into water has been a cause of major concern. Traditional treatment methods are proving to be ineffective and expensive. Chitosan was studied as a potential biosorbent due to its positive charge and relatively low cost. The study involves evaluating the metal binding performance of chitosan in a Polymer Enhanced Diafiltration (PEDF) system which uses an ultra filtration membrane to retain the chitosan which, in turn, binds the metal, thereby preventing passage into the permeate stream. Conditions for binding such as pH, concentration of polymer and chromium were studied. Optimal performance was obtained when the system was operated at pH values lower than the pKa of chitosan i.e. 6.3. Using 6 g/L chitosan at pH 4.0, chromium concentration was reduced to less than 1mg/L from a feed concentration of 20 mg/L. Equilibrium dialysis experiments were done to study the kinetics of binding and the uptake of metal per gram of polymer. Rheological measurements demonstrated that in the presence of 1-100 mM chromate, chitosan was found to be slightly shear thickening at low concentrations such as 4 g/L and 6 g/L whereas it was slightly shear thinning at higher concentrations like 12 g/L and 20 g/L This suggests that neutralization of chromium anions is due to the interaction of multiple chitosan molecules. This result is consistent with the relatively stiff nature of the polysaccharide. Overall, this study suggests that some modification of the native polymer would be required to improve uptake and make it an industrially workable process.
    Źródło:
    International Letters of Natural Sciences; 2014, 03
    2300-9675
    Pojawia się w:
    International Letters of Natural Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Determination of adsorption isotherm models for the biosorption of chromium using cherry leaves (Muntingia calabura L.)
    Autorzy:
    Aathithya, R.
    Sowparnika, J.R.
    Balakrishnan, V.
    Powiązania:
    https://bibliotekanauki.pl/articles/11799.pdf
    Data publikacji:
    2014
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    determination
    adsorption isotherm model
    biosorption
    chromium
    cherry
    leaf
    Muntingia calabura
    Opis:
    Contaminations of industrial metals into the river possess major threat to environment. Chromium is a heavy metal which has the wide applications in tannery and electroplating industries. Above the permitted level of Chromium(VI) into surface water leads to severe health hazards. Therefore, biosorption is a technology used for the sorption of heavy metal. In this present study adsorption isotherm models was studied for the biosorption of chromium by cherry leaves. From the adsorption isotherms it was found that the experimental data fits well with the Langmuir isotherm than the Freundlich isotherm. The monolayer capacity Qm was fond to be 11.98 mg/l and the adsorption affinity was found to be positive which indicates the efficient biosorption of chromium.
    Źródło:
    International Letters of Natural Sciences; 2014, 20
    2300-9675
    Pojawia się w:
    International Letters of Natural Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effect of chromium on growth, biochemicals and nutrient accumulation of paddy (Oryza sativa L.)
    Autorzy:
    Nagarajan, M.
    Sankar Ganesh, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/11254.pdf
    Data publikacji:
    2014
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    chromium
    heavy metal accumulation
    plant growth
    nutrient
    paddy
    Oryza sativa
    Opis:
    Chromium is a heavy metal; this element is considered as an environmental hazard. Toxicity effects of chromium on growth and development of plants including inhibition of germination process decrease of growth and biomass of plant. The aim of this research is to study accumulation of Chromium along with nutrients and its effect on the growth of Paddy plant (Oryza sativa L). Thus, paddy seedlings grown in petriplates lined with filter paper undergoing, different treatments of Cr (0, 2.5, 5, 10, 25, 50, 75, 100 and 200 mg/L). After one week seedlings were removed and morpho physiological parameters like root length, shoot length and dry weight of plants and Biochemicals ,accumulation of nutrients along with Cr in roots and shoots were determined. The results indicated that the concentrations more than 100 mg/L chromium cause the reduction of morphophysiology parameters in the treatment plants rather than control plant and Cr addition in the cultures caused enhancement of chromium content in roots and shoots of plant seedlings. Similarly the biochemicals and nutrient accumulation also affected by increasing concentrations of chromium. It was also noted that accumulation of chromium in the roots was much higher than the shoots of the seedlings under treatment.
    Źródło:
    International Letters of Natural Sciences; 2014, 18
    2300-9675
    Pojawia się w:
    International Letters of Natural Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Ecophysiological and biochemical changes in Abelmoschus esculentus (L.) Moench under chromium stress
    Autorzy:
    Unnikannan, P.
    Vedhanarayanan, P.
    Sundaramoorthy, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/10841.pdf
    Data publikacji:
    2014
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    ecophysiological change
    biochemical change
    Abelmoschus esculentus
    bhendi
    chlorophyll content
    mineral nutrient
    chromium stress
    biochemical parameter
    Opis:
    Increasing concentrations of chromium caused reduction in growth, chlorophyll contents and mineral mutrients of bhendhi. At increasing concentrations of chromium, all the attributes were found to be reduced. Chromium is one of the toxic elements discharging from tannery industry. The long disposal of tannery effluent to the agricultural land causes serious damages in the soil texture; reduce the growth of microorganisms and agricultural crops. Large areas of Vellore district of Tamilnadu was seriously affected by the tannery effluent irrigation to the agricultural land. The present study was conducted to identify the phytotoxic effect and physiological changes of Abelmoschus esculentus (L.) Moench under the treatment of different concentrations of chromium solutions (2.5, 5, 10, 25, 50, 75 and 100 mg/l). The result shows that there was a gradual reduction in the morphological parameters (root length, shoot length, fresh weight and dry weight). Similarly the photosynthetic pigments (Chlorophyll and carotenoid) and biochemical parameters such as protein, amino acid, and sugars were also gradually decreased with increasing concentrations of chromium.
    Źródło:
    International Letters of Natural Sciences; 2014, 02
    2300-9675
    Pojawia się w:
    International Letters of Natural Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Chromium toxicity in Sesbania sesban (L.) Merr
    Autorzy:
    Bakiyaraj, R.
    Mahakavi, T.
    Baskaran, L.
    Powiązania:
    https://bibliotekanauki.pl/articles/10775.pdf
    Data publikacji:
    2014
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    chromium
    toxicity
    Sesbania grandiflora
    pot experiment
    toxic effect
    plant
    germination
    chlorophyll
    enzyme
    metal accumulation
    seedling
    shoot
    Opis:
    Chromium is one of the most common toxic metals present in the environment that induces various toxic effects in plants. A pot experiment was conducted to determine the effects of chromium on germination percentage, seedling growth, chlorophyll ‘a’, ‘b’ and proline content of Sesbania sesban (L.) Merr. The seedlings were treated with different concentrations of control, 0.10, 0.25, 0.50, 0.75 and 1.00 g kg-1 of chromium. The parameters such as germination percentage, root and shoot length, seedling fresh weight dry weight, chlorophyll ‘a’, ‘b’ and proline content of leaves were measured. Our results indicated that a significant inhibitory effect was observed at all levels of chromium compared to control. Increasing the concentration of chromium to 1.00 g kg-1 showed a significant decrease in seed germination, shoot and root length, fresh weight, dry weight and chlorophyll ‘a’ and ‘b’ content of plant. While proline, catalase and peroxidase contents were increased by increasing Cr concentration. It was also noted that accumulation of chromium in the roots was much higher than the shoots of the seedlings under treatment.
    Źródło:
    International Letters of Natural Sciences; 2014, 04
    2300-9675
    Pojawia się w:
    International Letters of Natural Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Heavy metals in the waters of Dąbie Lake (North-West Poland) in the years 2008-2012
    Autorzy:
    Daniszewski, Piotr
    Powiązania:
    https://bibliotekanauki.pl/articles/1182425.pdf
    Data publikacji:
    2017
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    Cadmium
    Chromium
    Copper
    Dąbie Lake (North-West Poland)
    Heavy metal pollution
    Lead
    Mercury
    Nickel
    Zinc
    environment
    metals in water
    pollution
    Opis:
    Heavy metal pollution is an ever increasing problem of our lakes. These toxic heavy metals entering in aquatic environment are adsorbed onto particulate matter, although they can form free metal ions and soluble complexes that are available for uptake by biological organisms. The increase in residue levels of heavy metal content in water, sediments and biota has resulted in decreased productivity and increase in exposure of humans to harmful substances. Many of these metals tend to remain in the ecosystem and eventually move from one compartment to the other within the food chain. Food chain contamination by heavy metals has become a burning issue in recent years because of their potential accumulation in biosystems through contaminated water, soil, sediment and air. The Dąbie Lake is an integral part of the River Odra estuary. It is a shallow (2.5 m mean depth) water body with two distinct basins: the large (Dąbie Wielkie) and the small (Dąbie Małe). The aim of the studies, carried out in the years 2008 - 2012, was to determine the content of Cadmium (Cd), Chromium (Cr), Copper (Cu), Mercury (Hg), Nickel (Ni), Lead (Pb) and Zinc (Zn) in the waters of Dąbie Lake, being the internal part of the tertiary Odra estuary. The range of observed concentrations (ppm) for the analysed metals was between: maximum concentration of Cd was 0.97 ppm and the minimum was 0.42 ppm; maximum concentration of Cr was 0.28 ppm and the minimum was 0.12 ppm; minimum concentration of Cu was 0.04 ppm and maximum of 0.08 ppm; maximum concentration of Hg was 0.07 ppm and the minimum was 0.03 ppm; minimum concentration of Ni was 2.29 ppm and maximum of 2.97 ppm; maximum concentration of Pb was 0.09 ppm and the minimum was 0.04 ppm; minimum concentration of Zn was 2.85 ppm and maximum 3.94 ppm.
    Źródło:
    World Scientific News; 2017, 69; 75-85
    2392-2192
    Pojawia się w:
    World Scientific News
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-10 z 10

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