20.500.12556/RUL-154184 Vpliv kalibracije na merilno negotovost določitve kalcija v morski vodi Calibration influence on the measurement uncertainty of calcium determination in seawater V delu smo ovrednotili vpliv kalibracije na rezultate in merilno negotovost določitve kalcija v morski vodi z ionsko kromatografijo. Določitev je bila izvedena na podlagi kalibracijskega standarda s kalcijevo soljo in na podlagi kombiniranega standarda, ki posnema matrico vzorca. Merilno negotovost smo ovrednotili s pristopom od spodaj navzgor. Priprava vzorca in delovnih kalibracijskih raztopin je vključevala redčenje. Za vrednotenje negotovosti odmerjanja volumna smo uporabili gravimetrično metodo. Razlika v določitvi masne koncentracije kalcijevih ionov v morski vodi je bila signifikantna. Višjo masno koncentracijo smo določili pri uporabi kalibracijskega standarda s kalcijevo soljo. Merilna negotovost je bila večja pri določitvi s kombiniranim kalibracijskim standardom. Največji prispevek k merilni negotovosti ima negotovost interpolacije rezultata iz enačbe premice. Here were evaluated the results and the measurement uncertainty of the determination of calcium in seawater by ion chromatography. The determination was performed on the basis of a calibration standard with calcium salt and on the basis of a combined standard that took into account the matrix of the sample. Bottom-up approach was used to evaluate the measurement uncertainty. Preparation of sample and working calibration standards included dilution. Gravimetric method was used to evaluate the uncertainty of volumetric operations. The difference in the mass concentration of calcium ions in seawater obtained with these two different approaches was significant. Higher mass concentration was determined by using a calibration standard with calcium salt. Measurement uncertainty was higher when combined calibration standard was involved. The uncertainty of interpolation of the results from linear regression equation represented the largest contribution to the measurement uncertainty. določitev kalcija morska voda ionska kromatografija kalibracija merilna negotovost calcium determination seawater ion chromatography calibration measurement uncertainty true false false Slovenski jezik Angleški jezik Magistrsko delo/naloga 2024-01-30 10:20:01 2024-01-30 10:20:05 2024-02-01 12:03:13 0000-00-00 00:00:00 2024 0 0 0000-00-00 NiDoloceno NiDoloceno NiDoloceno 0000-00-00 0000-00-00 0000-00-00 23015 183349251 Sustersic_Maja_-_Vpliv_kalibracije_na_merilno_negotovost_dolocitve_kalcija_v_morski_vodi.pdf Sustersic_Maja_-_Vpliv_kalibracije_na_merilno_negotovost_dolocitve_kalcija_v_morski_vodi.pdf 1 6CF8E5EF58103E5E5DD3FE3FE057FCEC 3117f2d5cb1f59b65bc718f0227be106b32087e173cd71f40468ce863f769f5f c193fccf-bf50-11ee-ab6c-0050569b8976 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=180406 Fakulteta za kemijo in kemijsko tehnologijo 0 0 0