3 research outputs found
Optimization of Liquid Scintillation Spectrometer Quantulus 1220 for tritium determination in water samples after electrolytic enrichment
U radu je prikazana optimizacija uslova merenja na tečnom scintilacionom
spektrometru Ultra Low Level Liquid Scintillation Spectrometer Quantulus 1220 u cilju
određivanja tricijuma u uzorcima voda. Opisan je postupak određivanja efikasnosti,
optimalnog odnosa zapremine uzorka i scintilacionog koktela i optimalno vreme
merenja. Instrument je predviđen za merenje niskih aktivnosti tricijuma u uzorcima
prirodnih voda. U tu svrhu uzorci površinskih voda i padavina su elektrolitički
obogaćeni i kao takvi mereni na spektrometru. Rezultati pokazuju da su dobijene
aktivnosti tricijuma u datim vodama ispod granica predvidjenih zakonskom
regulativom.The paper presents the optimization of the measurement conditions for Ultra Low Level
Liquid Scintillation Spectrometer Quantulus 1220 in order to determine the tritium
activity in water samples after electrolytic enrichment. The procedure included
determination of efficiency, background, minimal detectable activity, the optimal ratio
of the sample volume and scintillation cocktail and the optimal measurement time. The
instrument is designed to measure low activity of tritium in natural water samples. For
this purpose, samples of surface waters and precipitation are electrolytically enriched
and as such are measured on a spectrometer.Зборник радова : XXIX симпозијум ДЗЗСЦГ : Сребрно језеро, 27-29. септембар 2017. годин
Optimization of Liquid Scintillation Spectrometer Quantulus 1220 for tritium determination in water samples after electrolytic enrichment
U radu je prikazana optimizacija uslova merenja na tečnom scintilacionom
spektrometru Ultra Low Level Liquid Scintillation Spectrometer Quantulus 1220 u cilju
određivanja tricijuma u uzorcima voda. Opisan je postupak određivanja efikasnosti,
optimalnog odnosa zapremine uzorka i scintilacionog koktela i optimalno vreme
merenja. Instrument je predviđen za merenje niskih aktivnosti tricijuma u uzorcima
prirodnih voda. U tu svrhu uzorci površinskih voda i padavina su elektrolitički
obogaćeni i kao takvi mereni na spektrometru. Rezultati pokazuju da su dobijene
aktivnosti tricijuma u datim vodama ispod granica predvidjenih zakonskom
regulativom.The paper presents the optimization of the measurement conditions for Ultra Low Level
Liquid Scintillation Spectrometer Quantulus 1220 in order to determine the tritium
activity in water samples after electrolytic enrichment. The procedure included
determination of efficiency, background, minimal detectable activity, the optimal ratio
of the sample volume and scintillation cocktail and the optimal measurement time. The
instrument is designed to measure low activity of tritium in natural water samples. For
this purpose, samples of surface waters and precipitation are electrolytically enriched
and as such are measured on a spectrometer.Зборник радова : XXIX симпозијум ДЗЗСЦГ : Сребрно језеро, 27-29. септембар 2017. годин
Degradation of linuron in soil by two fungal strains
Two fungal strains were applied to soil polluted with herbicide in order to
determine their degradation potential. Three experimental setups were used.
In the first setup, the soil in pots was contaminated by linuron in final
concentration of 1 ppm. Suspensions of Phanerocheate chrysosporium and
Trichoderma asperellum were applied separately or in combination. Tomato
plantlets were transplanted and chlorophyll content in their leaves was
determined at two time points during plant growth. In the second setup in
pots, the final concentration of linuron was lower, 0.45 ppm. In the third
setup 0.1 ppm of linuron was applied in the field plot. Plantlets of lettuce
were transplanted and chlorophyll content was measured as indicator of plant
stress. The content of linuron in soil was determined by HPLC. The applied
fungal strains significantly reduced toxic effect of 0.45 ppm linuron on
plants, which was not the case for 1 ppm linuron. Both fungi, applied
separately or in combination, were effective in decreasing the linuron
content in the soil. However, in field conditions the combination of both
fungi was the most effective. [Projekat Ministarstva nauke Republike Srbije,
br. III43010