Određivanje sadržaja silicijum-dioksida u boksitu: poređenje metode ICP-OES sa metodom UV-VIS
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U ovom radu metoda optičke emisione spektrometrije sa induktivno spregnutom plazmom (engl. inductively coupled plasma - optical emission spectrometry, ICP-OES) korištena je za određivanje sadržaja silicijum-dioksida u boksitu, kao važne primese koja utiče na kvalitet i primenu boksita u proizvodnji glinice po Bajerovom (Bayer) postupku. Analizirano je dvadeset uzoraka boksita iz sedam različitih ležišta. Rezultati su upoređivani sa referentnom metodom UV-vidljive spektroskopije. Srednja relativna razlika između sadržaja silicijum-dioksida određenog pomoću ICP-OES metode i referentne metode je 4.88 %. Za procenu usporedivosti metoda korišteni su statistički testovi, zatim grafikon raspršenosti (engl. scatter plot), te Bland - Altman, „Passing-Bablok“ i "Mountain" grafikoni. Grafičke komparacije uglavnom ne pokazuju statistički značajne razlike između metoda. Tačnost i preciznost ICP-OES metode proverena je pomoću standardnog referentnog materijala SRM NIST 697, boksit Dominikan. Vrednosti iskorištenja (engl. recovery) i ponovljivost, izražena kao relativna standardna devijacija (RSD), su u okviru kriterijuma prihvatljivosti. Na snovu t-testa postoji statistički značajna razlika između srednje vrednosti ICP-OES merenja i sertifikovane vrednosti sadržaja silicijum-dioksida, što se može pripisati efektu sistematske greške ICP-OES analize.
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