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排序方式: 共有2417条查询结果,搜索用时 15 毫秒
961.
Leonel Hernández-Mena Hugo Saldarriaga-Noreña Patricia Carbajal-Romero Ricardo Cosío-Ramírez Benjamín Esquivel-Hernández 《Environmental monitoring and assessment》2010,161(1-4):281-293
Atmospheric aerosol particles were collected from January to December 2007 at two sites in the City of Guadalajara. The first site (Centro) is located in the downtown, which is characterized by high vehicular traffic, and the second site (Miravalle) is in the southern part of the city, characterized by emissions from high industrial and vehicular activity. Sulfates, nitrates, and ammonium were the most abundant ions at both sites. Similar concentrations of sulfates, nitrates, and ammonium were observed throughout the year at Centro while only sulfates and nitrates were similar at Miravalle. From the balance of anions and cations at the two sites, Centro was determined to have acidic particles, while at Miravalle, the particles were alkaline. Based on the analysis of the ammonium/sulfate molar ratios, it was determined that in Centro, there was not enough ammonium to neutralize the sulfate, while at Miravalle, ammonium practically neutralized all sulfate. 相似文献
962.
Ana Julia Fernandes Cardoso de Oliveira Paula Thais Ranzani de França Aline Bartelochi Pinto 《Environmental monitoring and assessment》2010,169(1-4):375-384
Antimicrobial resistance of marine heterotrophic bacteria to different antimicrobials agents were evaluated in seawater, dry and wet sands from three marine recreational beaches with different pollution levels. In all studied beaches, the greatest frequencies of resistance were found in relation to penicillin. On Gonzaguinha, the most polluted beach, 72.3% of all isolated strains showed simple resistance, whilst 8.33% had multiple resistance. The values found on Ilha Porchat beach, were 70.8% and 6.9% for simple and multiple resistances, respectively. On Guaraú, the less polluted beach, only 35.3% of isolated strains had simple resistance. Multiple resistance was not observed. While samples from Gonzaguinha and Ilha Porchat beach showed isolated strains resistant to seven and six different antimicrobial agents, respectively, samples from Guaraú beach were resistant only to penicillin and erytromicin. The positive correlations obtained between the degree of seawater contamination and frequency and variability of bacterial resistance indicate that polluted marine recreational waters and sands are sources of resistant bacteria contributing thus, to the dissemination of bacterial resistance. 相似文献
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Sewage pollution effects on mesozooplankton structure in a shallow temperate estuary 总被引:1,自引:0,他引:1
Biancalana F Menéndez MC Berasategui AA Fernández-Severini MD Hoffmeyer MS 《Environmental monitoring and assessment》2012,184(6):3901-3913
The effects of a sewage effluent with no treatment on the mesozooplankton structure and the environmental quality were evaluated
in the Bahía Blanca Estuary, during June to November 1995. The highest values of particulate organic matter, nutrients and
specially phosphate, were observed in the effluent discharge zone. In addition, taxa richness, mesozooplankton abundance and
Shannon diversity values were lower in the sewage discharge area compared with the less polluted area. Eurytemora americana and Acartia tonsa as well as larvae of Balanus glandula, Neohelice granulata and Spionidae were found in the discharge area with lower densities. These results highlight the importance of sewage effluent
effects on mesozooplankton community providing background data to use in other monitoring programmes. 相似文献
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Deniz Demirbilek Ayten Öztüfekçi Önal Veysel Demir Gulsad Uslu Hilal Arslanoglu-Isık 《Environmental monitoring and assessment》2013,185(11):9435-9449
Environmental monitoring of leachate quality from an open municipal solid waste dumping site in Tunceli, Turkey was studied in this research. The most commonly examined pollution parameters were determined on a seasonal basis. The annual average 5-day biological oxygen demand (BOD5) and chemical oxygen demand (COD) values of station points were measured as 70 and 425 mg/L, respectively, and also the average BOD5/COD ratio (a measure of biodegradability) was calculated as 0.20. The low ratio of biodegradability and slightly alkaline pH values in the leachate samples indicated that the site was characterized by methanogenic conditions. The mean ammonium-nitrogen (NH4 +-N) and corresponding phosphate (orthophosphate) values were assayed as 70 and 11 mg/L, respectively. The average solids content in the leachates was measured as 4,681 mg/L (total solids) and 144 mg/L (suspended solids). Very low concentrations of iron, manganese, copper, and zinc in the leachate samples were found and the concentration of cadmium was measured below detection limits. Excessive amount of nutrients and high organic and inorganic pollutant content in the leachates pose serious pollution potential to the environment. Since no drainage system or bio treatment exists in this open dumping site, high permeability of natural soil at the site and in the surrounding area and very fractured and crackled rocks under natural soil are indicators of high groundwater pollution potential in this site. 相似文献