Search results for "Sample area"

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On-line bidirectional electrostacking of chromium(III) and chromium(VI) for flame atomic absorption spectrometry determination

2000

Abstract An on-line bidirectional electrostacking-flow injection-flame atomic absorption spectrometry method has been developed for the simultaneous separation, pre-concentration and determination of Cr(III) and Cr(VI). The electrostacking-flow injection unit was established, the pH and components of the support buffer and sample medium were investigated. Results indicated that the ionic mobility, electric field strength and sample area cross-section are the main influence factors on the electrostacking. The calibration range for both, Cr(III) and Cr(VI), was from 20 to 400 μg l −1 . The limit of detection was 7 μg l −1 for three-times the standard deviation of blank values using a electros…

Detection limitAnalytical chemistrychemistry.chemical_elementIonic bondingBiochemistryAnalytical Chemistrylaw.inventionChromiumchemistryFlame atomic absorption spectrometrylawEnvironmental ChemistrySample areaAtomic absorption spectroscopyQuantitative analysis (chemistry)SpectroscopyLine (formation)Analytica Chimica Acta
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Giustizia ambientale e recupero delle aree verdi: il caso di Palermo

2021

L’urban shrinkage è diventata una questione centrale tanto nel dibattito scientifico quanto nell’agenda politica di diverse città europee. Secondo i dati EUROSTAT (2019), circa il 40% delle città europee con più di 200.000 abitanti stanno perdendo popolazione; una contrazione che si esplicita maggiormente, sotto il profilo spaziale, in una progressiva sottoutilizzazione del patrimonio edificato, così come nel contestuale incremento di aree e terreni in stato di abbandono. In questo quadro controverso di mutazione strutturale della città, così come l’abbiamo conosciuta, le politiche urbane alla prova in Europa tentano di declinare la decrescita quale occasione strategica di investimento sull…

Urban shrinkage became a central issue in both the scientific debate and the political agenda of several European cities. According to EUROSTAT data (2019) about 40% of European cities with more than 200000 inhabitants are losing population. A shrinkage that is more explicit in a progressive underutilization of the built heritage as well as in the concomitant increase of abandoned areas. In this controversial framework of structural mutation of the city urban policies in Europe try to decline the degrowth as a strategic opportunity to invest in green areas in order to increase urban quality and to act simultaneously on the development of local economies. With respect to the above framework this contribution focuses on the evaluation of the effects that the project of new public green spaces have generated on some sample areas on the outskirts of the city of Palermo. An urban context where according to the latest Svimez Report (2019) the phenomenon of urban shrinkage represents a constantly growing trend and on which the new Master Plan operates through a revival of interventions on environmental capital and urban green areas of the city.Settore ICAR/21 - Urbanistica
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