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2012, vol. 66, br. 5, str. 701-708
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Desorpcija radiocezijuma-137 iz lišaja Cetraria Islandica (L.) Ach. rastvorima koji simuliraju kisele kiše
Influence of acid rain components on radiocesium-137 desorption from Cetraria Islandica (L.) Ach. lichen
aUniverzitet u Beogradu, Institut za primenu nuklearne energije - INEP bUniverzitet u Beogradu, Fakultet za fizičku hemiju
e-adresa: anas@inep.co.rs
Projekat: Nove tehnologije za monitoring i zaštitu životnog okruženja od štetnih hemijskih supstanci i radijacionog opterećenja (MPNTR - 43009)
Sažetak
Desorpcija 137Cs iz lišaja Cetraria islandica (L.) Ach., vršena je korišćenjem pet uzastopnih desorpcija sa pet identičnih zapremina rastvora. Za desorpciju su korišćeni rastvori H2SO4, HNO3 i njihova smeša, na pH 4,61; 5,15 i 5,75. Desorbovana količina 137Cs (srednja vrednost svih korišćenih rastvora) iz lišaja je 49,2; 47,0 i 47,6% na pH 4,61; 5,15 i 5,75, redom. Dobijene vrednosti desorbovane količine 137Cs iz lišaja slažu se sa podacima dobijenim u ranijim radovima, kada je iz lišaja na pH 3,75 desorbovano 46,2% 137Cs i 47,2% na pH 2,87. Veći procenat 59,8%, dobijen pri pH 2,00 ukazuje na povećano delovanje H+ jona. Količina desorbovanog 137Cs iz lišaja sa rastvorima koji odgovaraju kiselim kišama, ne može biti manja od navedenih vrednosti, jer u njima ima i drugih supstanci, a ne samo u ovom radu korišćenih kiselina.
Abstract
Desorption of 137Cs from Cetraria islandica (L.) Ach. lichen was performed by five consecutive desorptions with five identical solution volumes. Solutions of H2SO4, HNO3 and their mixtures, with pH 4.61, 5.15 and 5.75 were used for desorption. The desorbed amount of 137Cs (average value, all solutions used) from lichen, for a given pH value was 49.2% for pH 4.61; 47.0% for pH 5.15 and 47.6% for pH 5.75. The obtained values of the desorbed amount of 137Cs from lichen are in accordance with the data obtained in earlier work, when 46.2 % 137Cs was desorbed from lichen for pH 3.75, and 47.2% was desorbed for pH 2.87. A higher percentage of 59.8%, obtained for pH 2.00 indicates increased activity of H+. The amount of desorbed 137Cs from lichen using solutions corresponding to acid rain cannot be lower than the stated values as they contain other substances besides the acid solutions used in this work.
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