Naslov
Comparison of sample preparation methods for the ICP-AES determination of minor and major elements in clarified apple juices

Autori
Juranović Cindrić, Iva ; Zeiner, Michaela ; Kröppl, Michaela ; Stingeder, Gerhard

Izvornik
Microchemical journal (0026-265X) 99 (2011), 2; 364-369

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
ICP-AES; microwave assisted digestion; minor and major elements; apple juice

Sažetak
Inductively coupled plasma atomic emission spectrometry (ICP-AES) was used for the determination of minor and major elements present in apple juices. Prior to ICP-AES measurement, samples were diluted with nitric acid or digested in a microwave assisted digestion system. The differences in the measured element concentrations after application of different types of sample preparation procedures are discussed. The direct measurement compared to closed microwave dissolution was found to be the best sample preparation procedure. Prior to the measurements the ICP-AES method was validated and optimized for the determination of elements in apple juices. For diluted apple juice samples the lowest limits of detection (LOD) were obtained for Ba and Cd (< 20 µg L-1), moderate ones for Cu, Mn, Ni, Fe, Ag, Ca, Cr, Zn, Mg, Sr (20-100 µg L-1), and the highest LODs for K, Pb, Na, and Al (>110 µg L-1). The results obtained for the repeatability (<0.9%), the intermediate precision (<4.5%), the day-to-day reproducibility (<5.2%), and the overall uncertainty of measurement (approx. 4-7%) for all elements analyzed demonstrated the good applicability of the proposed method. Differences in major element content in fresh and commercial apple juice are discussed.

Izvorni jezik
Engleski

Znanstvena područja
Kemija

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