crta
Hrvatska znanstvena Sekcija img
bibliografija
3 gif
 Naslovna
 O projektu
 FAQ
 Kontakt
4 gif
Pregledavanje radova
Jednostavno pretraživanje
Napredno pretraživanje
Skupni podaci
Upis novih radova
Upute
Ispravci prijavljenih radova
Ostale bibliografije
Slični projekti
 Bibliografske baze podataka

Pregled bibliografske jedinice broj: 592912

Zbornik radova

Autori: Gverić, Zvonka; Kampić, Štefica; Marković, Tamara; Jozić, Dražan; Biševac, Vanja; Tibljaš, Darko
Naslov: Mineralogical and chemical characteristics of Croatian bentonites
Izvornik: Informator, 49, Book of Abstracts / Šťastný Martin Žigová Anna (ur.). - Průhonice : Czech National Clay Group , 2012. 150-150.
Skup: 6th Mid-European Clay Conference (MECC'12)
Mjesto i datum: Průhonice, Češka, 04.-09.09.2012.
Ključne riječi: bentonite ; beidellite ; montmorillonite ; CEC ; heavy metals adsorption
Sažetak:
In Croatia several bentonite deposits have already been described. The aim of the present study was to obtain additional information on mineralogical and chemical characteristics of bentonites from several deposits: Maovice-Štikovo (Middle Dalmatia, S Croatia), Gornja Jelenska (Moslavina, N Croatia), Bednja and Poljanska Luka (Hrvatsko Zagorje, NW Croatia), and Divoselo (Lika, SW Croatia). In addition bentonite from nearby deposit Šipovo in W Bosnia and Herzegovina was analyzed for comparison. All of the investigated deposits have been formed by alteration of volcanic material. The deposits' ages range from Upper Jurassic (Maovice-Štikovo), through Lower Miocene (Gornja Jelenska and Bednja), to Upper Miocene (Poljanska Luka). The age of the Divoselo deposit is still unknown due to extensive erosion of the uppermost layers. The samples (whole rock and <2µm fraction) were analyzed by X-ray diffraction, FTIR spectroscopy, thermal and chemical (ICP-AES and ICP-MS) methods. The cation exchange capacity (CEC) of the samples was determined with two different methods (ammonia electrode and [Cu(en)2]2+), while the exchangeable cations were measured by atomic emission and absorption spectroscopy. Additionally, the ability of the studied bentonites to adsorb heavy metals (Pb, Cu and Zn) from aqueous solution was measured by atomic absorption spectroscopy. According to the trace elements content, original volcaniclastic material was andesitic to rhyolitic in composition. The main constituent in all the samples is dioctahedral smectite ; montmorillonite in all the samples except in those from Divoselo and Šipovo deposits in which chemical analyses (primarily higher content of Al), lower dehydroxylation temperature as well as the results of the Greene-Kelly test revealed the presence of beidellite. Other constituents, type and quantity of which vary within and between deposits, are clinoptilolite, calcite, quartz, opal-CT and plagioclase. In all the samples the main exchangeable cation measured is calcium. Adsorption of Pb, Cu and Zn on studied bentonites is positively correlated with their CEC. The results showed that analysed bentonites preferentially remove Pb from aqueous solutions containing these heavy metals.
Vrsta sudjelovanja: Poster
Vrsta prezentacije u zborniku: Sažetak
Vrsta recenzije: Međunarodna recenzija
Projekt / tema: 181-1811096-3165, 119-1191155-1156
Izvorni jezik: ENG
Kategorija: Znanstveni
Znanstvena područja:
Geologija,Rudarstvo, nafta i geološko inženjerstvo
Upisao u CROSBI: dtibljas.geol@pmf.hr (dtibljas.geol@pmf.hr), 14. Ruj. 2012. u 07:56 sati



Verzija za printanje   za tiskati


upomoc
foot_4