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[{"key": "dc.contributor.advisor", "value": "Ven\u00e4l\u00e4inen, Eija-Riitta", "language": null, "element": "contributor", "qualifier": "advisor", "schema": "dc"}, {"key": "dc.contributor.advisor", "value": "V\u00e4is\u00e4nen, Ari", "language": null, "element": "contributor", "qualifier": "advisor", "schema": "dc"}, {"key": "dc.contributor.author", "value": "J\u00e4rvinen, Janne", "language": null, "element": "contributor", "qualifier": "author", "schema": "dc"}, {"key": "dc.date.accessioned", "value": "2018-04-12T06:06:56Z", "language": null, "element": "date", "qualifier": "accessioned", "schema": "dc"}, {"key": "dc.date.available", "value": "2018-04-12T06:06:56Z", "language": null, "element": "date", "qualifier": "available", "schema": "dc"}, {"key": "dc.date.issued", "value": "2018", "language": null, "element": "date", "qualifier": "issued", "schema": "dc"}, {"key": "dc.identifier.other", "value": "oai:jykdok.linneanet.fi:1867336", "language": null, "element": "identifier", "qualifier": "other", "schema": "dc"}, {"key": "dc.identifier.uri", "value": "https://jyx.jyu.fi/handle/123456789/57564", "language": null, "element": "identifier", "qualifier": "uri", "schema": "dc"}, {"key": "dc.description.abstract", "value": "Seleeni on ihmisille t\u00e4rke\u00e4 hivenaine, mutta v\u00e4li riitt\u00e4v\u00e4n p\u00e4ivitt\u00e4isannostuksen ja myrkyllisen annoksen v\u00e4lill\u00e4 on suhteellisen kapea. T\u00e4m\u00e4n vuoksi seleenin tarkka analytiikka on eritt\u00e4in t\u00e4rke\u00e4\u00e4. T\u00e4m\u00e4n tutkielman kirjallisessa osassa kuvataan seleenin kemialliset ominaisuudet sek\u00e4 terveysvaikutukset hivenaineena. Suomessa elintarvikkeiden riitt\u00e4v\u00e4\u00e4 ja turvallista seleenipitoisuutta s\u00e4\u00e4dell\u00e4\u00e4n seleenilannoituksin. Tutkielmassa tarkastellaan my\u00f6s t\u00e4m\u00e4n lannoituksen vaikutusta elintarvikkeiden seleenipitoisuuksiin.\nElintarvikkeiden pienten seleenipitoisuuksien vuoksi ICP-MS-tekniikka (Induktiivisesti kytketty plasma -massaspektrometria) on k\u00e4ytetyin analyysimenetelm\u00e4 seleenin mittaukseen. Seleeni on kuitenkin suhteellisen haasteellinen alkuaine mitata ICP-MS-tekniikalla seleenin korkean ionisoitumisenergian ja useiden eri mittausta h\u00e4iritsevien tekij\u00f6iden vuoksi. Tutkielman kirjallisessa osassa syvennyt\u00e4\u00e4n tarkemmin n\u00e4iden mittaush\u00e4iri\u00f6iden teoriaan.\nTutkielman kokeellisessa osassa tarkastellaan seleenin mittausta h\u00e4iritsevi\u00e4 tekij\u00f6it\u00e4. Mahdollista j\u00e4\u00e4nn\u00f6shiilen aiheuttamaa seleenin mittaush\u00e4iri\u00f6t\u00e4 tutkittiin lis\u00e4\u00e4m\u00e4ll\u00e4 mitattaviin liuoksiin metanolitausta. Taustan korjaaminen paransi seleenin mittaustuloksia, mutta muiden alkuaineiden mitattavuus samoista n\u00e4yteliuoksista heikentyi. Seleenin osalta saantoprosentit laskivat metanolia lis\u00e4tt\u00e4ess\u00e4 n\u00e4ytteest\u00e4 riippuen 3\u201311 %-yksikk\u00f6\u00e4. My\u00f6s gadoliniumin aiheuttamaa mittaush\u00e4iri\u00f6t\u00e4 tutkittiin, mutta elintarvikkeiden gadoliniumpitoisuuksien todettiin olevan liian pieni\u00e4 aiheuttamaan h\u00e4iri\u00f6t\u00e4.\nTutkielman yhteydess\u00e4 j\u00e4rjestettiin my\u00f6s rengastesti, jossa laboratoriot mittasivat kuivatun lihan\u00e4ytteen seleenipitoisuuden. Kaikkien laboratorioiden tulokset olivat z-arvoiltaan hyv\u00e4ksytt\u00e4vi\u00e4. Tulosten yhteydess\u00e4 laboratoriot ilmoittivat my\u00f6s k\u00e4ytetyt mittausmenetelm\u00e4t. Tuloksista voidaan havaita, ett\u00e4 ICP-MS-tekniikassa k\u00e4ytetyll\u00e4 t\u00f6rm\u00e4ys- tai reaktiokaasulla ja sen virtausnopeudella on merkitt\u00e4v\u00e4 vaikutus seleenin mittaustulokseen. Tutkielman aiheen kannalta on jatkossa mielek\u00e4st\u00e4 tutkia tarkemmin eri t\u00f6rm\u00e4ys- ja reaktiokaasujen k\u00e4ytt\u00f6\u00e4 sek\u00e4 erisuuruisia kaasuvirtauksia seleenin mittauksen yhteydess\u00e4.", "language": "fi", "element": "description", "qualifier": "abstract", "schema": "dc"}, {"key": "dc.description.provenance", "value": "Submitted using Plone Publishing form by Janne J\u00e4rvinen (jaaremja) on 2018-04-12 06:06:55.778855. Form: Pro gradu -lomake (https://kirjasto.jyu.fi/julkaisut/julkaisulomakkeet/pro-gradu-lomake). JyX data: [jyx_publishing-allowed (fi) =True]", "language": "en", "element": "description", "qualifier": "provenance", "schema": "dc"}, {"key": "dc.description.provenance", "value": "Submitted by jyx lomake-julkaisija (jyx-julkaisija.group@korppi.jyu.fi) on 2018-04-12T06:06:56Z\nNo. of bitstreams: 2\nURN:NBN:fi:jyu-201804122043.pdf: 2193787 bytes, checksum: 07101baf42ece12e49441bdb13079b5b (MD5)\nlicense.html: 4872 bytes, checksum: 79257ed0a6eaaf85a7c66b46cd36476f (MD5)", "language": "en", "element": "description", "qualifier": "provenance", "schema": "dc"}, {"key": "dc.description.provenance", "value": "Made available in DSpace on 2018-04-12T06:06:56Z (GMT). No. of bitstreams: 2\nURN:NBN:fi:jyu-201804122043.pdf: 2193787 bytes, checksum: 07101baf42ece12e49441bdb13079b5b (MD5)\nlicense.html: 4872 bytes, checksum: 79257ed0a6eaaf85a7c66b46cd36476f (MD5)\n Previous issue date: 2018", "language": "en", "element": "description", "qualifier": "provenance", "schema": "dc"}, {"key": "dc.format.extent", "value": "1 verkkoaineisto (103 sivua)", "language": null, "element": "format", "qualifier": "extent", "schema": "dc"}, {"key": "dc.format.mimetype", "value": "application/pdf", "language": null, "element": "format", "qualifier": "mimetype", "schema": "dc"}, {"key": "dc.language.iso", "value": "fin", "language": null, "element": "language", "qualifier": "iso", "schema": "dc"}, {"key": "dc.rights", "value": "In Copyright", "language": "en", "element": "rights", "qualifier": null, "schema": "dc"}, {"key": "dc.subject.other", "value": "seleeni", "language": null, "element": "subject", "qualifier": "other", "schema": "dc"}, {"key": "dc.subject.other", 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