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2013, vol. 67, br. 6, str. 975-980
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Desorpcija 137Cs iz mahovine Homalothecium sericeum (Hedw.) Schim. - slabo kiselim rastvorima
Desorption of 137Cs from Homalothecium sericeum (Hedw.) Schim.: Moss using weakly acid solutions
aUniverzitet u Beogradu, Institut za primenu nuklearne energije - INEP
bUniverzitet u Beogradu, Fakultet za fizičku hemiju
Projekat: Nove tehnologije za monitoring i zaštitu životnog okruženja od štetnih hemijskih supstanci i radijacionog opterećenja (MPNTR - 43009)
Sažetak
Desorpcija 137Cs iz mahovine Homalothecium sericeum (Hedw.) Schim. vršena je korišćenjem pet uzastopnih desorpcija sa pet identičnih zapremina rastvora. Za desorpciju su korišćeni rastvori: H2SO4, HNO3 i njihova smeša, H2SO4-HNO3, pH vrednosti 4,61; 5,15 i 5,75; kao i destilovana voda pH 6,50. Posle pet sukcesivnih desorpcija iz mahovina je od sorbovane kiseline desorbovano od 22,8% (rastvor H2SO4-HNO3 pH 5,75) do 33,2% (rastvor H2SO4-HNO3 pH 4,60) 137Cs, a destilovanom vodom 31,3% 137Cs. Prvom desorpcijom iz mahovine desorbuje se najviše 137Cs, od 9,0 do 17,9%. Srednje vrednosti procenta ukupno desorbovanog 137Cs iz mahovine su slične: za rastvor H2SO4 28,8%; HNO3 25,7% i H2SO4- -HNO3 28,6%, što ukazuje da NO3- i SO42- nemaju uticaj na desorpciju Cs+. Korišćene pH vrednosti rastvora ne utiču značajno na desorpciju 137Cs iz mahovine. Posle pet sukcesivnih desorpcija iz mahovine 137Cs se ne desorbuje u značajnoj meri. U intervalu pH od 4,61 do 6,50 desorpcione supstance su H2O i H+, a manji uticaj imaju SO42- i NO3-. Postoje dva mesta sorpcije, odnosno dve vrste sorpcije, pri čemu je jedna dominantna.
Abstract
Desorption of 137Cs from Homalothecium sericeum (Hedw.) Schim. moss was performed using five consecutive desorptions with five identical solution volumes. The following solutions were used for desorption: H2SO4, HNO3 and their mixture H2SO4-HNO3, with pH values of 4.61; 5.15 and 5.75; and also distilled water pH 6,50. After five consecutive desorptions from 22.8% (solution H2SO4-HNO3, pH 5.75) to 33.2% (solution H2SO4-HNO3, pH 4.60) of 137Cs was desorbed by the sorbed acid, while by distilled water 31.3% of 137Cs was desorbed. The highest amount of 137Cs was desorbed by the first desorption, from 9.0 to 17.9%. Mean values of the total percentage of desorbed 137Cs from moss were similar: for solution H2SO4 28.8%; HNO3 25.7% and H2SO4-HNO3 28.6%, which indicates that NO3- and SO42- do not have an influence on Cs+ desorption. The used pH values of solutions do not significantly influence 137Cs desorption from moss. After five consecutive desorptions 137Cs was not significantly desorbed from moss. In the pH interval of 4.61 to 6.50 the desorbed substances were H2O and H+, while SO42- and NO3- had a smaller influence. There are two sorption points, i.e., two sorption types where one is dominant.
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