20.500.12556/DKUM-14809 Določanje težkih kovin z ICP - AES v kalcijevih fosfatih ICP - AES determination of heavy metals in calcium phosphates Namen diplomske naloge je bil s pomočjo meritev realnih vzorcev kalcijevih fosfatov in meritev referenčnih materialov oziroma standardov z ICP — AES ugotoviti ali je ta metoda primerna za določanje vsebnosti arzena, kadmija in svinca v vzorcih kalcijevih fosfatov krmne in prehrambene kvalitete ter pregled rezultatov realnih vzorcev glede na veljavno zakonodajo. Ker je proizvajalcev kalcijevih fosfatov v svetu zelo malo, tudi literature o analitiki ni veliko. Najprej sem s pomočjo referenčnega materiala in pripravljenih standardov potrdila, da je metoda, s katero sem določevala vsebnost težkih kovin, primerna za izbrano merilno območje. Nato sem izmerila še vsebnost težkih kovin v realnih vzorcih kalcijevih fosfatov ter njihove vrednosti primerjala z veljavno zakonodajo na področju krme in živil. Vsebnosti arzena, kadmija in svinca so v skladu z zakonodajo v kalcijevih fosfatih krmne kvalitete od 10 mg/kg za arzen in kadmij, do 15 mg/kg za svinec. V kalcijevih fosfatih prehrambene kvalitete pa so te vrednosti nižje, saj znašajo od 1 mg/kg za kadmij, 3 mg/kg za arzen in 4 mg/kg za svinec. The purpose of the diploma thesis was to measure in real samples of calcium phosphates and reference materials or standard solutions by ICP - AES to confirm whether this method is suitable for the determination of arsenic, cadmium and lead in samples of calcium phosphates "feed" and "food" quality and check the quality of results from real samples depending on the applicable legislation. There is few literature data available on analysis of heavy metals of calcium phosphate since there are not many producers of calcium phosphates in the world. First of all, it was confirmed using a reference material and prepared standards that the method for determination a content of heavy metals is suitable in a selected range. Then I measured the amount of heavy metals in real samples of calcium phosphates, and their content was compared with the current legislation on feed and food. The content of arsenic, cadmium and lead is in accordance with the law in calcium phosphates "feed" quality of 10 mg / kg for arsenic and cadmium, and 15 mg / kg for lead. For calcium phosphates "food" qualities these values are lower, ranging from 1 mg / kg for cadmium, 3 mg / kg for arsenic and 4 mg / kg for lead. ICP – AES kalcijevi fosfati težke kovine arzen kadmij svinec ICP – AES Calcium phosphates heavy metals arsenic cadmium lead true true false [T. T. Medveš] Slovenski jezik Angleški jezik Diplomsko delo 2010-07-08 21:14:24 2010-07-20 12:31:35 2022-04-12 22:20:15 2023-12-18 03:19:38 2010 0 Maribor 0 0000-00-00 NiDoloceno NiDoloceno NiDoloceno 0000-00-00 0000-00-00 0000-00-00 543.42:666.123.4(043.2) 14398742 URN:SI:UM:DK:S99LMDCF VS_Medves_Tanja_Tatjana_2010.pdf VS_Medves_Tanja_Tatjana_2010.pdf 1 25DBA39DA9413AC4E7D4C4F78C0F7A01 579c7bade6bce939f9549a20f62dee8c43c02f91a41d6d79f8a2ab91c590924d 3e0cdddf-7c04-11eb-bb7a-00155d0001ca 20.500.12556/dkum/ff756b28-156d-4bc3-bc9f-f7d5308f4cd0 https://dk.um.si/Dokument.php?lang=slv&id=15979 Fakulteta za kemijo in kemijsko tehnologijo 0 0 0