Evaluation of selected ubiquitous contaminants in the aquatic environment and their transformation products. A pilot study of their removal from a sewage treatment plant

A simple method using direct sample injection combined with liquid chromatography tandem mass spectrometry has been developed for the simultaneous analysis of six alkaloid compounds in environmental samples. The target list includes two psychostimulants (nicotine and caffeine), three metabolites (cotinine, nicotinic acid and paraxanthine) and a coffee chemical (trigonelline). The analytical method was evaluated in three different matrices (surface water, influent and effluent wastewater). The method developed showed an adequate sensitivity, below 0.6 μg L⁻¹ for wastewater and 0.1 μg L⁻¹ for river matrices, without any prior treatment of the samples. Finally, the methodology was applied to real samples for evaluation of their removal from a sewage treatment plant and their persistence/fate in the aquatic environment. All compounds studied in this work were detected at all sampling points collected along the Henares River. However, nicotinic acid was only detected three times in treated sewage samples at levels above its detection limit.     

美国正在起草可能《限制使用卤代烃类灭火剂的法规》

1概述 本文旨在汇总现有对卤代烃（HFC）类产品有关的意见和建议，可帮助您在进行商业规划时能更详细地了解这些情况，以便对现行的管理机制进行评估和提出建议。例如对此类产品使用上的限制、减少生产计划、减少投资、考虑拍卖和制造厂的安排以及有关卤代烃的其他相关措施。     

A seasonal study of the mecA gene and Staphylococcus aureus including methicillin-resistant S. aureus in a municipal wastewater treatment plant

The spread of methicillin-resistant Staphylococcus aureus (MRSA), in which the mecA gene mediates resistance, threatens the treatment of staphylococcal diseases. The aims were to determine the effect of wastewater treatment processes on mecA gene concentrations, and the prevalence of S. aureus and MRSA over time. To achieve this a municipal wastewater treatment plant was investigated for the mecA gene, S. aureus and MRSA, using real-time PCR assays. Water samples were collected monthly for one year, at eight sites in the plant, reflecting different aspects of the treatment process. The mecA gene and S. aureus could be detected throughout the year at all sampling sites. MRSA could also be detected, but mainly in the early treatment steps. The presence of MRSA was verified through cultivation from inlet water. The concentration of the mecA gene varied between months and sampling sites, but no obvious seasonal variation could be determined. The wastewater treatment process reduced the mecA gene concentration in most months. Taken together our results show that the mecA gene, S. aureus and MRSA occur over the year at all sites investigated.     

A new analytical approach to the long term behaviour of moisture concentrations in building cavities—I. Non-condensing cavity

This paper, the first of two, presents a conceptual model of moisture concentrations in a building cavity. The model is comprehensive and general considering air infiltration, vapour diffusion and material hygroscopicity under non-steady state conditions. The resulting linearised coupled differential equations are analytically solved to study the case of long term cavity moisture behaviour. Dimensionless parameters and algebraic formulae are presented describing all important moisture performance parameters for a non-condensing cavity. Two primary time constants are identified, and a third, which governs the drying rate, derived. This allows the identification of three drying regimes based on cavity tightness. Some general design recommendations are given.     

Free fluoride of the Pamlico River in North Carolina. A new method to localize the discharge of polluted water into an Estuary

The commonly employed method of referring ion contents to the salinity of the water may lead to misinterpretation with regard to the degree of pollution when applied to complex water systems such as estuaries where the water of tributaries mix with ocean water and industrial water. Experimental Ca²⁺ and Mg²⁺ data were used to underline the problem.Fluoride concentrations of approx. 100 estuarine water samples were referred both to distance from an arbitrarily selected sampling site and to the salinity of the water. The comparison of the two relations revealed that the method of referring the ion content to distance is a suitable means to localize the discharge of polluted waste into an estuary.     

The contribution of cultural participation to urban well-being. A comparative study in Bolzano/Bozen and Siracusa,Italy

What is the role of culture in contemporary urban life? Can culture function as an urban planning tool for individual and social well-being? Two elements are of special relevance in this regard: cultural vibrancy in terms of level of initiative in policies, use of facilities and activities, and individual and social propensities towards the participation in, and consumption of, cultural activities and goods. This paper takes the recent path of research on the impact of cultural participation on the social and economic sustainability of urban processes, with a specific focus on the individual subjective well-being dimension. Two Italian cities, one endowed with a high stock of cultural facilities, activities, and access (Bolzano/Bozen) and the other with a comparatively much lower stock in all respects (Siracusa), are examined. Comparative analysis suggests that the impact of culture on subjective well-being in a context of high cultural supply and substantial cultural participation is much more relevant with respect to low-endowment and low-participation cases, thus suggesting the possibility of a culture/well-being positive feedback dynamics leading to urban ‘cultural poverty traps’. On the basis of these results, we draw some implications for cultural policy design in urban contexts.     

A Study of Human Reactions to Emissions from Building Materials in Climate Chambers. Part II: VOC Measurements,Mouse Bioassay,and Decipol Evaluation in the 1–2 mg/m3 TVOC Range

Monitoring of human reactions to the emission of formaldehyde and volatile organic compounds (VOC) from four commonly used building materials was carried out. The building materials were: a painted gypsum board, a rubber floor, a nylon carpet, and a particle board with an acid-curing paint. The exposures were performed in climate chambers. The air quality was quantified on the decipol scale by a trained panel, measurements of formaldehyde and VOC being performed simultaneously. The irritating potency of the materials was measured by a mouse bioassay. The VOC measurements showed several malodorants and irritants. Some abundant VOC identified in the head-space analyses were absent in the climate chamber air. The rubber floor and the nylon carpet exhibited a marked increase in decipols compatible with a number of odorous VOC identified in the air. A high formaldehyde concentration (minimum 743μg/m³) was measured for the particle board coated with an acid-curing paint. This was not reflected by a corresponding relatively high decipol value but a long-lasting irritating potency was observed in the mouse bioassay. TVOC sampled on Tenax and expressed in mass per volume as well as in molar concentration, and decipol evaluation both have limitations and should be used with caution as indicators of (perceived) indoor air quality. Eye irritation expressed by means of the eye index reflecting the tear film quality index (comprised of break-up time, foam formation, thickness of the precorneal lipid layer of the tear film, and epithelial damage) was found to be insensitive to formaldehyde and a VOC mixture but sensitive to TVOC concentrations of 1–2 mg/m³. Lipophilic VOC may be the cause of reduced tear film quality by destabilization of the lipid multilayer of the tear film.