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Zeolite characterization of “Vico red tuff with black scoria” ignimbrite flow: The extractive district of Civita Castellana (Viterbo, Italy)
No full textThe results of the work undertaken on one of the major ignimbrite flows of northern Lazio in Italy, the so-called “Vico red tuff with black scoria” are reported. A survey of bed thickness, carried out on the working faces of different quarries revealed that the available data in the literature underestimated the size of
the deposit. The extension of the studied area, named as the “extractive district of
Civita Castellana”, has been estimated to be about 150 km2 with a volume of not less than 5.5km3. XRD analysis indicated a high zeolite content in the tuffs ranging
from 29% to 67%. The most abundant species are chabazite which predominates and occurs mainly in the matrix of the rock, and phillipsite in smaller proportion chiefly found in the scoria fraction. The cation exchange capacity (CEC) was determined either directly by ion exchange or estimated combining EDS elemental analyses with XRD data, and the differences between the two applied methods are discussed. The
CEC values are in the range 1.65 to 2.20 meq/g with Ca++ and K+ as the main components. By removing completely Ca++ a limit value of 2.40 has been reached.
Parent materials have been tested for removal of NH4
+ from dilute solutions. The
chemical and mineralogical characteristics of this material combined with its high availability at outcrop enables new horizons to be opened up with good prospects
for diverse fields of application and a promising economic potential
THE INTERNATIONAL PROJECT “KIDSINNSCIENCE”: A COMMUNITY OF PRACTICE TO ADAPT AND EXPERIMENT INNOVATIONS IN SCIENCE EDUCATION
No full textThe research was carried out in Italy as part of the international project “KidsINNscience: Innovation in Science Education - Turning Kids on to Science”, a collaborative research project funded by the European Commission, involving ten partner countries and running from November 2009 to July 2013. The project investigated how to transfer innovations in science and technology from one country to another in order to develop teaching and learning adaptive strategies and to facilitate the innovation of curricula. Innovative practices (IPs) in science and technology education - ranging from pre-primary to upper secondary school and covering a broad range of subjects and topics - were collected in each of the participating countries; the IPs were selected according to defined quality criteria, adapted and implemented in a field trial by teachers in mainstream schools, and finally evaluated in terms of transferability, feasibility and effectiveness. Cultural diversity, gender aspects and activity-based and learner-centred approaches were explicitly addressed in all phases of the project
Sito Web del progetto Astro-Scienze: Didattica e divulgazione dell'Astronomia, della Fisica e delle Scienze Naturali.
No full textSi veda: (S)progetti pilota: Scienze fisiche - Progetto Astro-Scienze (Miur,"Iniziative per la diffusione della cultura scientifica" L. 6/2000
Ion-exchange features of intermediate-silica sedimentary phillipsite.
No full textSTUDIES IN SURFACE SCIENCE AND CATALYSIS 13
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