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101.
Molina Carmen B. Sanz-Santos Eva Boukhemkhem Ali Bedia Jorge Belver Carolina Rodriguez Juan J. 《Environmental science and pollution research international》2020,27(31):38434-38445
Environmental Science and Pollution Research - Fe2O3-TiO2-clay heterostructures have been prepared using an organo-bentonite as support, which organophilic character favored the fixation of TiO2.... 相似文献
102.
Isabelle J. Brisson Patrick Levallois Hélène Tremblay Jean Sérodes Christian Deblois Jeffrey Charrois Vincent Taguchi Jessica Boyd XingFang Li Manuel J. Rodriguez 《Environmental monitoring and assessment》2013,185(9):7693-7708
The spatiotemporal presence of eight N-nitrosamines in the water of seven supply systems in Quebec considered to be susceptible to these emerging disinfection by-products was evaluated. This is the first study on the presence of N-nitrosamines in drinking water utilities in Quebec. Seven sampling campaigns were carried out at several sampling points in each of the systems over a period of 1 year. The results show that N-nitrosamines, primarily N-nitrosodimethylamine (NDMA), were not commonly detected in the water of the facilities under study (10 % of samples). The concentrations measured were lower than those reported in recent North American studies. None of the 195 samples taken exceeded the Ontario standard of 9 ng/L for NDMA (maximum value observed of 3.3 ng/L). N-nitrosomethylethylamine and N-nitrosopiperidine were detected once, with concentrations of 3.7 and 6.0 ng/L, respectively. Chloramination was identified as being the main risk factor regarding the presence of N-nitrosamines, but water quality and some operating parameters, in particular disinfectant residual, also seem to be related to their presence. NDMA concentrations at the end of the distribution systems were generally higher than water leaving the plant. No seasonal trends were observed for the formation of N-nitrosamines in the investigated supply systems. Finally, an association between the presence of N-nitrosamines and the levels of trihalomethanes and haloacetic acids was observed in some facilities. 相似文献
103.
Bigogno Rodrigo Gonçalves Dias Marcos Lopes Manhães Mariana Borges N. Sanchez Rodriguez Ruben J. 《Journal of Polymers and the Environment》2022,30(4):1228-1243
Journal of Polymers and the Environment - This study was developed a novel nanostructured membrane by electrospinning process, from polyacrylonitrile (PAN) modify by hydroxypropyl methylcellulose... 相似文献
104.
The cleaning process is one of the major maintenance operation for liquid metal fast reactors (LMFRs), both in operation and in their decommissioning stage. Russian and French cleaning processes are briefly described, including problems which have arisen during the processes. It appears that the cause of these problems is always connected to bad draining of the component, resulting in a vigorous reaction between vapour or liquid water and the bulk of sodium. From this discussion, the paper makes major recommendations for the efficient and safe cleaning of sodium wetted components, and proposes several processes which should be developed in order to deal with difficult situations, for example the removal of large amounts of undrainable sodium. 相似文献
105.
106.
Garcia F Barioni A Arruda-Neto JD Deppman A Milian F Mesa J Rodriguez O 《Environment international》2006,32(5):697-703
Natural levels of uranium in the diet of S?o Paulo City residents were studied, and radionuclide concentrations were measured by the fission track method on samples of typical adult food items. This information was used to evaluate the daily intake of uranium in individuals living in S?o Paulo City which is, according to our findings, around 0.97 microg U/day. Using the ICRP Uranium-model, we estimated the uranium accumulation and committed doses in some tissues and organs, as function of time. We compared the output of the ICRP uranium biokinetic model, tailored for the conditions prevailing in S?o Paulo, with experimental data from other localities. Such comparison was possible by means of a simple method we developed, which allows normalization among experimental results from different regions where distinct values of chronic daily intake are observed. 相似文献
107.
Bergweiler C Carreras H Wannaz E Rodriguez J Toselli B Olcese L Pignata ML 《Environmental monitoring and assessment》2008,138(1-3):305-312
In Argentina no historical or present programs exist specifically assessing ecosystem health with respect to photochemical
air pollution, although phytotoxic concentrations of near-ground ozone have been documented in recent years. Here we report
our preliminary findings on field observations of ozone-like injury found in natural plant populations and agroecosystems
late in the 2005 growing season in the Southern Hemisphere. Several possible ozone bioinidicator plants which have not been
previously documented were observed to exhibit foliar symptoms consistent with ozone-induced injury. Based on these results
we intend to expand field surveys and complete the screening process for injury confirmation of the plant species described
here. For this and future research we will be using controlled chamber studies based in the US. Continuous monitoring of tropospheric
ozone does not currently take place in the region of central Argentina. The combined evidence provided by intermittent air
quality sampling and the presence of ozone-like injury to vegetation indicates the need to establish air quality and ozone
biomonitoring networks in this region. 相似文献
108.
Fulvio Amato Xavier Querol Andrés Alastuey Marco Pandolfi Teresa Moreno José Gracia Pau Rodriguez 《Atmospheric environment (Oxford, England : 1994)》2009,43(29):4472-4480
Despite their burden in urban particulate air pollution, road traffic non-exhaust emissions are often uncontrolled and information about the effectiveness of mitigation measures on paved roads is still scarce. The present study is aimed to evaluate the effectiveness of mechanical sweeping/water flushing treatments in mitigating urban road dust resuspension and to quantify the real benefit in terms of ambient PM10 concentrations. To this aim a specific campaign was carried out in a heavily trafficked central road of Barcelona (Spain), a Mediterranean city suffering from a traffic-related pollution, both for a high car density and a frequent lack of precipitation. Several street washings were performed by means of mechanical sweepers and pressure water during night in all traffic lanes and sidewalks. PM10 levels were simultaneously compared with four reference urban background air quality stations to interpret any meteorological variability. At the downwind measurement site, PM10 concentrations registered a mean daily decrease of 8.8 μg m?3 during the 24 h after street washing treatments. However 3.7–4.9 μg m?3 of such decrease were due to the meteorological variability detected at the upwind site, as well as at two of the reference sites. This reveals that an effective decrease of 4–5 μg m?3 (7–10%) can be related to street washing efficiency. Mitigation of road dust resuspension was confirmed by investigating the chemical composition of airborne-PM10 filters. Concentrations of Cu, Sb, Fe and mineral matter decrease significantly with respect to concentrations of elemental carbon, used as tracer for exhaust diesel emissions. High efficiency of street washing in reducing road dust loads was found by performing periodic samplings both on the treated and the untreated areas. 相似文献
109.
Raquel Garcia Rodriguez Loida Garcia Cruz Yeray Novoa Medina Raquel Garcia Delgado Julio Perez Gonzalez Carmen Palma Milla Juan Lopez Siles Margarita Medina Castellano Jose Angel Garcia Hernandez Alfredo Santana Rodriguez 《黑龙江环境通报》2019,39(6):415-419
Solitary median maxillary central incisor (SMMCI) syndrome is a complex disorder consisting of multiple, developmental defects involving midline structures of the head, which includes the cranial bones, the maxilla, and its container dentition (specifically the central incisor tooth germ), together with other midline structures of the body. SMMCI may appear as an isolated trait or in association with other midline developmental anomalies. We describe the case of a patient with SMMCI. He presented with a solitary median maxillary incisor, short stature, corpus callosum anomalies and a microform of holoprosencephaly (HPE), diabetes insipidus, and neurodevelopmental delay. The diagnosis was performed postnatally based on clinical features, radiological imaging, and a comprehensive genetic study. SMMCI can be diagnosed during the prenatal or neonatal periods or during infancy. Evaluation of the superior maxillary bone is important for prenatal diagnosis. Direct evaluation through bidimensional ultrasound or the use of multiplanar ultrasound or tridimensional reconstruction should be performed in cases of brain or face malformations. Early diagnosis can contribute to improved prenatal assessment and postnatal management. 相似文献
110.
G. La Loggia S. Calvo G. Ciraolo A. Mazzola M. Pirrotta G. Sar A. Tomasello S. Vizzini 《Chemistry and Ecology》2004,20(3):183-201
An integrated approach using hydrodynamic and transport numerical models, lepidochronology and stable isotope analysis was used to investigate how local hydrodynamic conditions influence the primary production and fate of the seagrass Posidonia oceanica in a Mediterranean semi-enclosed marine system (Stagnone di Marsala). The water mass exchange aptitude of different sectors of the basin was analysed, and data collected were used to select two sectors (colonized by Posidonia oceanica showing the lowest and highest water exchange values) for biological analyses. According to the mean dispersal coefficient differences simulated by the hydrodynamic model, growth rate and primary production of P. oceanica differed between sectors, with average values lower in the central sector where water exchange is lower than in the southern sector. Although P. oceanica coverage and primary production were higher in the southern sector, carbon and nitrogen stable isotope analysis suggests that the transfer of seagrass organic matter to higher trophic levels of the food web was higher in the central sector. The possibility of a link between hydrodynamism, production and fate of organic matter is proposed to explain the observed patterns. 相似文献