Please use this identifier to cite or link to this item: https://biore.bio.bg.ac.rs/handle/123456789/6346
Title: Analysis of Tea for Metals by Flame and Graphite Furnace Atomic Absorption Spectrometry with Multivariate Analysis
Authors: Popović, Slađana 
Pantelić, Ana
Milovanović, Željka
Milinkov, Jelena
Vidović, Milka
Keywords: Flame atomic absorption spectrometry;;Graphite furnace atomic absorption spectrometry;;Herbal teaprincipal component analysis;;Redundancy analysis.
Issue Date: 2017
Rank: M23
Publisher: Taylor and Francis Ltd
Journal: Analytical Letters
Volume: 50
Issue: 16
Start page: 2619
End page: 2633
Abstract: 
The concentrations of iron, zinc, manganese, copper, chromium, nickel, lead, arsenic, and cadmium were determined using flame and graphite furnace atomic absorption spectrometry in nine herbal tea samples. Hawthorn, yarrow, elderflower, and bearberry are herbal teas for which the metal content has been rarely determined. The concentration of cadmium in St John’s wort exceeded the maximum permissible limit of 0.3 mg/kg. The metals were also determined in aqueous extracts following 5, 10, and 20 min of boiling and using different preparations, including acidification with lemon juice. The influence of these factors on metal release was demonstrated using multivariate analyses by redundancy analysis and principal component analysis. The metal release was not considerably affected by the boiling time, while the acidity of the medium was generally positively correlated. For the infusions, arsenic was detected only in acidified mint tea. The extraction efficiencies of metals were determined and classified as highly, moderately, and poorly extractable, with chromium showing largest variations.
URI: https://biore.bio.bg.ac.rs/handle/123456789/6346
DOI: 10.1080/00032719.2017.1307849
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