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排序方式: 共有160条查询结果,搜索用时 23 毫秒
101.
Marta Staniszewska Bożena Graca Magdalena Bełdowska Dominika Saniewska 《Environmental science and pollution research international》2013,20(6):4154-4163
Annual study on the benzo(a)pyrene (BaP) concentration in aerosols in the coastal zone of the Gulf of Gdansk (southern Baltic) has been performed at Gdynia station. Combustion processes, especially domestic heating of both local and regional origin, were identified as the main sources of benzo(a)pyrene in this area. Concentrations observed during the heating season (mean 2.18 ng?m?3) were significantly higher than these recorded in the non-heating season (mean 0.05 ng?m?3). High benzo(a)pyrene concentrations were associated with low temperature and high humidity. Whereas high levels of precipitation usually decreased the BaP concentration in aerosols. The concentration of this factor in the studied area depended also on the wind direction and air masses trajectories. During heating season, continental air masses (coming from S, SE, SW) seemed to increase benzo(a)pyrene concentration, while maritime air masses (from N, NE, NW) caused its decrease. The differences in the BaP concentration resulting from potentially different emission levels of this compound during working and non-working days were not clearly pronounced. 相似文献
102.
Wojciech Franus Magdalena Wdowin Małgorzata Franus 《Environmental monitoring and assessment》2014,186(9):5721-5729
In this paper, we present the possibility of using fly ash to produce synthetic zeolites. The synthesis class F fly ash from the Stalowa Wola SA heat and power plant was subjected to 24 h hydrothermal reaction with sodium hydroxide. Depending on the reaction conditions, three types of synthetic zeolites were formed: Na-X (20 g fly ash, 0.5 dm3 of 3 mol?·?dm?3 NaOH, 75 °C), Na-P1 (20 g fly ash, 0.5 dm3 of 3 mol?·?dm?3 NaOH, 95 °C), and sodalite (20 g fly ash, 0.8 dm3 of 5 mol?·?dm?3 NaOH?+?0.4 dm3 of 3 mol?·?dm?3 NaCl, 95 °C). As synthesized materials were characterized to obtain mineral composition (X-ray diffractometry, Scanning electron microscopy-energy dispersive spectrometry), adsorption properties (Brunauer-Emmett-Teller surface area, N2 isotherm adsorption/desorption), and ion exchange capacity. The most effective reaction for zeolite preparation was when sodalite was formed and the quantitative content of zeolite from X-ray diffractometry was 90 wt%, compared with 70 wt% for the Na-X and 75 wt% for the Na-P1. Residues from each synthesis reaction were the following: mullite, quartz, and the remains of amorphous aluminosilicate glass. The best zeolitic material as characterized by highest specific surface area was Na-X at almost 166 m2?·?g?1, while for the Na-P1 and sodalite it was 71 and 33 m2?·?g?1, respectively. The ion exchange capacity decreased in the following order: Na-X at 1.8 meq?·?g?1, Na-P1 at 0.72 meq?·?g?1, and sodalite at 0.56 meq?·?g?1. The resulting zeolites are competitive for commercially available materials and are used as ion exchangers in industrial wastewater and soil decontamination. 相似文献
103.
Paiva Robert Veroneze Isabelly Bertochi Wrona Magdalena Nerín Cristina Cruz Sandra Andrea 《Journal of Polymers and the Environment》2022,30(2):494-503
Journal of Polymers and the Environment - Recycling of polymers is one of the alternatives to reduce the impact of polymers presence on the environmental. However, the contaminants, defined as... 相似文献
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Ewa Szara Tomasz Sosulski Magdalena Szymańska Katarzyna Szyszkowska 《Environmental monitoring and assessment》2018,190(5):298
A considerable area of soils with low abundance of plant-available phosphorus and relatively low consumption of phosphorus fertilisers recorded in Poland over the last 20–25 years suggests that the dispersion of phosphates from arable soils in Poland can be low. The literature, however, provides reports on a considerable share of Polish agriculture in phosphorus pollution of Baltic Sea waters. The literature provides no data concerning phosphorus sorption parameters of arable soils in Poland. Due to this, the study involved the analysis of sorption properties: 1-point phosphorus sorption index (PSI) and degree of phosphorus saturation, based on molar ratio P, Al, and Fe determined by the Mehlich-3 method (DPS-1M3?=?P / (Al?+?Fe) and DPS-2M3?=?P / Al), 59 soils representing the main types of texture of soils in Poland, characterised by variable content of plant-available phosphorus by Egner-Riehm DL, organic carbon, and soil pH. The obtained results suggest that the soil texture has a lower effect on sorption properties (PSI) than the degree of acidification. Sorption parameters of soils increased with soil acidification as a result of an increase in the content of Al and Fe extracted by the Mehlich-3 extract in strongly acidified soils. An important finding of our study was evidencing that within the same class of abundance in plant-available phosphorus, the soils varied in the degree of phosphorus saturation and content of active phosphorus. This suggests the possibility of losses of phosphorus even from soils with low abundance of the component provided they are characterised by a high value of parameters DPS-1M3 and DPS-2M3. 相似文献
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Magdalena V. Monferrán José A. Sánchez Agudo María L. Pignata Daniel A. Wunderlin 《Environmental pollution (Barking, Essex : 1987)》2009,157(8-9):2570-2576
Bioaccumulation and toxicity of copper was evaluated on Potamogeton pusillus L. The effect of copper (5–100 μg L?1) applied for several days was assessed by measuring changes in the chlorophyll's, phaeophytin's, malondialdehyde, electrical conductivity, glutathione peroxidase (GPX), glutathione reductase (GR) and guaiacol peroxidase (POD) activities. Plants accumulated copper with a maximum of 162 μg g?1 dw after 7-days exposure at 100 μg L?1, however most of the metal was accumulated after 1-day exposure. The toxic effect caused by Cu was evident by the reduction of photosynthetic pigments, increase of malondialdehyde and electrical conductivity. P. pusillus shows Cu-induced oxidative stress by modulating antioxidant enzymes like GPX, GR and POD. Antioxidant enzymes activity increased significantly after exposure to 40 μg L?1 during 24 h, followed by a drop at longer times. Thus, P. pusillus is proposed as a good biomonitor for the assessment of metal pollution in aquatic ecosystems. 相似文献
110.
Giorgio Bertanza Matteo Canato Giuseppe Laera Mentore Vaccari Magdalena Svanström Sara Heimersson 《Environmental science and pollution research international》2017,24(21):17383-17393
A holistic assessment procedure has been used in this study for comparing conventional activated sludge (CAS) and membrane bioreactor (MBR) processes for the treatment of municipal wastewater. Technical, social, administrative, economic and environmental impacts have been evaluated based on 1 year of operational data from three full-scale lines (one MBR and two CAS) working in parallel in a large municipal treatment plant. The comparative assessment evidences a slight advantage of the conventional process in the studied case, essentially due to lower costs, complexity and energy consumption. On the other hand, the MBR technology has a better social acceptance and similar overall environmental footprint. Although these results are influenced by site-specific parameters and cannot be generalized, the assessment procedure allowed identifying the most important factors affecting the final scores for each technology and the main differences between the compared technologies. Local conditions can affect the relative importance of the assessed impacts, and the use of weighting factors is proposed for better tailoring the comparative assessment to the local needs and circumstances. A sensitivity analysis on the weighted final scores demonstrated how local factors are very important and must be carefully evaluated in the decision making process. 相似文献