Petrescu M.,Institute for Industrial Ecology |
Batrinescu G.,Institute for Industrial Ecology |
Stanescu B.,Institute for Industrial Ecology
International Journal of Conservation Science | Year: 2011
Our study presents the evaluation of gaseous emissions generated by a non-compliant municipal landfill after its closure (municipal landfill Rǎdǎuţi). To this end we measured and interpreted the characteristics of gaseous emissions captured in two monitoring boreholes made on the deposit surface (F1 and F2). The main components of landfill gas are CH4 and CO2, and in lower proportions O2, N2 and nitrogen oxides, and also traces ofH2S and CO. Their concentrations were measured using a portable gas analyzer GA type 2000Plus, which recorded simultaneously temperature and pressure data of the landfill gas. The high concentration of about 60% CH4 and approximately 39% CO2 in the landfill gas captured in two different areas (F1 and F2) shows the polluting character of those emissions with a direct impact on the environmental component air, due to the greenhouse effect produced by those two components. Moreover, the characteristics of the measured gaseous emissions (a CH4 content above 50%, a 2-3 l/h flow rate) indicates they have significant energy potential and represent a possible source of renewable energy.
Ivan S.,Institute for Industrial Ecology |
Lucaciu I.,Institute for Industrial Ecology |
Rusu G.,Institute for Industrial Ecology |
Vasile I.,Institute for Industrial Ecology
Journal of Environmental Protection and Ecology | Year: 2010
The research work presents the evaluation of superoxide dismutase enzymatic activity modifications as a result of toxic effect of dangerous chemicals. Superoxide dismutase is an efficient enzymatic antioxidant and plays an important role in the protection reaction of organism against negative effects of the free radicals. Therefore it is necessary to study this enzyme for determination of dangerous chemicals toxicity on it For this study two pesticides were selected: atrasine and mevinphos, whose toxicity characteristics have been determined after performing ecotoxicological test to evaluate their risk on aquatic organisms (fish of Cyprinus carpió species), sensitive to the toxic action of compounds taken in study. In order to obtain relevant results, an enzymatic kit for measure of superoxide dismutases (MnSOD and CuZnSOD) has been used. Measurements were performed from protein extracts obtained from intoxicated fish organs. The biochemical method is a spectrometrical method and tetrazolium salt is used for superoxide radical detection, produced by xantinoxidase. The obtained results have led to the conclusion that dangerous chemicals taken in study determine catalytic activity modifications of superoxide dismutase toward blank. In addition, in case of mevinphos the enzyme may be completely inhibited, this being suffocated by the proper metabolites (H2O2 or *OH). These modifications of superoxide dismutase activity can lead to drastic consequences on aquatic organisms.