86 research outputs found
Multivariate statistical and GIS-based approach to identify heavy metal sources in soils
No full textThe knowledge of the regional variability, the background values and the anthropic vs. natural origin for potentially harmful elements in soils is of critical importance to assess human impact and to fix guide values and quality standards. The present study was undertaken as a preliminary survey on soil contamination on a regional scale in Piemonte (NW Italy). The aims of the study were: (1) to determine average regional concentrations of some heavy metals (Cr, Co, Ni, Cu, Zn, Pb); (2) to find out their large-scale variability; (3) to define their natural or artificial origin; and (4) to identify possible non-point sources of contamination. Multivariate statistic approaches (Principal Component Analysis and Cluster Analysis) were adopted for data treatment, allowing the identification of three main factors controlling the heavy metal variability in cultivated soils. Geostatistics were used to construct regional distribution maps, to be compared with the geographical, geologic and land use regional database using GIS software. This approach, evidencing spatial relationships, proved very useful to the confirmation and refinement of geochemical interpretations of the statistical output. Cr, Cc and Ni were associated with and controlled by parent rocks, whereas Cu together with Zn, and Pb alone were controlled by anthropic activities. The study indicates that background values and realistic mandatory guidelines are impossible to fix without an extensive data collection and without a correct geochemical interpretation of the data
Assessment of Chromium release from steel manufacturing waste
No full textIndustrial waste of different origins has been dumped for decades (1950–1980) in a landfill of 150,000m2 area, a few km from the centre of Torino (NW Italy). A large portion of this landfill, estimated to be in the order of 1,100,000m3 and extending over a surface of 55,000m2, is composed of steel manufacturing waste.
This study discusses an investigation of this waste mass in order to assess the total Cr concentration and solubility, identify the main Cr-bearing phases and estimate the release of Cr to rainwater leaching through the material and the consequent
contamination of groundwater
Monitoring Aedes albopictus population dynamic in the zoo of Rome by a novel sticky trap.
No full textADHESIVE TRAP FOR MOSQUITOES
No full textTrap for mosquito mainly constituted by a base (2) , a basket (3) and a cover (4) , characterized in that: the base (2) has a clear colour, contrasting with respect to the one of the basket (3) ; the basket (3) has a dark colour, contrasting with respect to the one of the base (2) ; the cover (4) is mainly constituted by a covering member (8) and by partitions which can be fixed with greater length than the one of the height of the basket (3) so that the covering member (8) does not rest onto the edge (9) of the basket (3) and leaves then an opening (10) , wherein the partitions delimitate niches and house adhesive disposable slips of paper, whereon the mosquitoes remain attached
Kaposi's sarcoma, human herpesvirus 8 infection and the potential role of promoter-arthropod bites in northern Sweden.
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Development of a novel sticky trap for container-breeding mosquitoes and evaluation of its sampling properties to monitor urban populations of Aedes albopictus.
No full textMathematical models as aids for design and development of experiments: the case of transgenic mosquitoes.
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