Wyniki wyszukiwania - Biblioteka Nauki

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Reagent Removal of Heavy Metals From Waters of Coal Mines and Spoil Tips of the Lviv-Volyn Industrial Mine Region

100%

Mazurak O. , Solovodzinska I. , Mazurak A. , Gryncyhshyn N.

Journal of Ecological Engineering

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2019

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tom Vol. 20, nr 8

50--59

EN

The article substantiates the efficiency of using chemical (reagent) technologies for the purification of industrial water from mines and spoil tips from heavy metals-toxicants and reducing their ecological hazard. The ecological risk indices of toxicants and their proportion in the overall level of ecological danger of the investigated object were presented. The results of experimental studies, interaction of comparative qualitative indicators of removal of heavy metal ions by inorganic reagents – calcium carbonate and sodium hydroxide were provided. It is shown that the solution of the ecological problem concerning the reduction of the toxicity level of subterminal waters of mines is their treatment with fine calcium carbonate CaCO3 that converts the heavy metal ions into hardly soluble basic carbonates or heavy metal hydroxides. Positive results concerning the efficiency of the subterminal water treatment of the «Velikomostovskaya» mine of the Chervonograd mining area by calcium carbonate were identified. That indicates a significant reduction of the ecological hazard indicator of the treated wastewater. The content of ions of most heavy metals, which precipitate in the form of basic carbonates at values close to pH = 8.5, was significantly reduced.

2

Phytoremediation of Soils by Cultivation Miscanthus x Giganteus L. and Phalaris arundinacea L.

100%

Romantschuk L. , Matviichuk N. , Mozharivska I. , Matviichuk B. , Ustymenko V. , Tryboi O.

Ecological Engineering & Environmental Technology

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2024

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tom Vol. 25, iss. 6

137--147

EN

Restoring soil fertility and protecting it from pollution are complex scientific tasks of our time that require a set of physical, chemical and biological measures. An important theoretical and applied aspect is the development of new remediation methods to reduce soil degradation processes under the influence of chemical pollution. The publication analyzes the ecological features of the energy crops Miscanthus giganteus L. and Phalaris arundinacea L. as phytoremediation agents of soils contaminated with heavy metals, pesticides, and oil products. The content of toxicants in contaminated soils as a result of energy crops cultivation has significantly decreased, in particular, the content of mobile forms and the mass fraction of heavy metals. The greatest decrease was observed in the content of mobile forms of chromium: in the area contaminated with petroleum products by 0.55 mg/kg when growing reeds and by 1.06 mg/kg when growing miscanthus, and in the area contaminated with pesticides by 3.65 and 5.25 mg/kg, respectively. The gross stibium content decreased in the area contaminated with oil products by 60 mg/kg when growing reeds and by 69.61 mg/kg of soil when growing miscanthus, and by 65.68 and 78.35 mg/kg in the area contaminated with pesticides. The concentration of cadmium in the studied plots where energy crops were grown decreased in the range of 0.131–0.193 mg/kg when growing Phalaris arundinacea L. and by 0.187–0.312 mg/kg when growing Miscanthus giganteus L., respectively. The content of organic pollutants was also significantly reduced.

3

Comparative study of nitrosamine in roasted food base on the roasting methods

84%

Ogunmodede T. T. , Ojo A. A. , Jegede O.

International Letters of Natural Sciences

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2016

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tom 50

EN

The present study examined the interrelationships of roasting methods and nitrosamine compounds (NA) content in eleven food sample investigated. The total level of NA in examined food ranged from 1.1x10-3 μg per g in oven roasted white maize to 5.0x10-3 μg per g in wood roasted pig meat that is lower than the legal level in WHO (0.001 μg per kg ). The significant increase of NA concentration in all food samples on roasting was observed. Methods of roasting have significant effects on the level of nitrosamine in each of the material used.

4

Effects of cadmium and selenium on antioxidant defense system in red blood cells of rats

67%

Stajn A. S. , Zikic R. V. , Ognjanovic B. I. , Pavlovic S. Z.

Biological Bulletin of Poznań. Supplement

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1996

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tom 33

5

"Zdrowy" arszenik

67%

Huszał S. , Huszał A.

Analityka : nauka i praktyka

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2007

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tom nr 4

39-42

6

Effects of nonylphenol-induced oxidative stress in ovary of cichlid fish, Etroplus maculatus (Bloch, 1795)

59%

Asifa K. P. , Chitra K. C.

International Letters of Natural Sciences

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2016

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tom 58

EN

The present study was designed to evaluate the effects of nonylphenol in the pro-oxidant/ antioxidant system in ovary of the cichlid fish Etroplus maculatus. Fishes were exposed at two sublethal concentrations (one-fifth and one-tenth of LC50) of nonylphenol for 24, 72 and 96 h maintaining control groups. The oxidative stress indices as the activities of antioxidant enzymes, superoxide dismutase, catalase, glutathione reductase along with the levels of hydrogen peroxide generation and lipid peroxidation were monitored in concentration- and time-dependent manner. Activity of superoxide dismutase significantly (P<0.05) increased at both concentrations in timedependent manner. Meanwhile the activities of catalase and glutathione reductase significantly (P<0.05) decreased after 72 and 96 h of nonylphenol treatment. The levels of hydrogen peroxide generation and lipid peroxidation increased in all treatment groups when compared to controls. The present results demonstrated that the induction of oxidative stress in ovary of fish by the generation of lipid peroxidation could be due to the exposure of environmental contaminant, nonylphenol. Therefore, the observed oxidative stress in ovary can be indicated as a mechanism of toxicity in the fish exposed to nonylphenol.