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Ugotavljanje vsebnosti selena v rastlinskih vzorcih in krmnih mešanicah = Determination of selenium in plants and mixed feedsStibilj, Vekoslava ; Mazej, DarjaSelen je eden od elementov, ki je že v sledovih zelo pomemben za življenske procese. V majhnih količinah jeorganizmu nujno potreben in ga zato uvrščamo med esencialne elemente, v večjih količinah pa ... je toksičen. Razlika med toksičnostjo in esencialnostjo je zelo majhna, zato je potrebno kontrolirati vnos selena v organizme in njegove zaloge v njih. Za živali veljam da dobijo selen predvsem s krmo. Krmne rastline vsebujejo večinoma zelo malo selena (pod 100n/g), zato se v krmne meašnice selen dodaja v obliki natrijevega selenita ali natrijevega seenata. Dodajanje selena je v Sloveniji dovoljeno s Pravilnikom o kakovosti krme in s Pravilnikom o največjih količinah škodljivihsnovi in sestavin v krmi, podatkov o dejanski vsebnosti selena v krmnih mešanicah pa je zelo malo. Tudi podatkov o vsebnosti selena v surovinah, ki jih uvažamo, velikokrat ni na voljo, zato lahko pride do previsokega vnosa. Namen našega dela je bil izdelati metodo za rutinsko določanje selena v sledovih v rastlinskih vzorcih in krmnih mešanicah z uporabo atomske absorpcijske spektrometrije s hidridno tehniko (HG-AAS). Izdelana metoda je relativno hitra in enostavna z mejo zaznavnosti 4ng/g ter mejo določitve 13 ng/g vzorca. Pravilnost in zanesljivost postopka smo preverili z analizami certificiranih referenčnih vzorcev in s primerjavo rezultatov neodvisne metode radiokemične nevtronske aktivacijske analize (RNAA). Opisana metoda je primerna za določanje vsebnosti selena v rastlinskihvzorcih in krmnih mešanicah. V analiziranih rastlinskih vzorcih (jerebiki, rododendronu, resi, smreki, ruševju in travi) je bilo selena manj kot 50ng/g suhe snovi, v analiziranih krmnih mešanicah po 200-400ng/g.Source: Zbornik predavanj posvetovanja o prehrani domačih živali "Zadravčevi-Erjavčevi dnevi" = Proceedings of the conference on nutrition of domestic animals "Zadravec-Erjavec days" (Str. 118-126)Type of material - conference contributionPublish date - 1997Language - slovenianCOBISS.SI-ID - 302216
Author
Stibilj, Vekoslava |
Mazej, Darja
Topics
prehrana živali |
krma |
krmne mešanice |
trave |
mikroelementi |
selen |
analitska kemija |
atomska absorbcijska spektrometrija |
HG-AAS
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Stibilj, Vekoslava | 01873 |
Mazej, Darja | 18287 |
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