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Analysis of Tea for Metals by Flame and Graphite Furnace Atomic Absorption Spectrometry with Multivariate Analysis

Authorized Users Only
2017
Authors
Popović, Slađana
Pantelić, Ana
Milovanović, Željka
Milinkov, J.
Vidović, Milka
Article (Published version)
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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.

Keywords:
Flame atomic absorption spectrometry / graphite furnace atomic absorption spectrometry / herbal tea / principal component analysis / redundancy analysis
Source:
Analytical Letters, 2017, 50, 16, 2619-2633
Publisher:
  • Taylor and Francis Inc.
Projects:
  • Geologic and ecotoxicologic research in identification of geopathogen zones of toxic elements in drinking water reservoirs- research into methods and procedures for reduction of biochemical anomalies (RS-176018)
Note:
  • The peer-reviewed version: http://cer.ihtm.bg.ac.rs/handle/123456789/3065

DOI: 10.1080/00032719.2017.1307849

ISSN: 0003-2719

WoS: 000413898200009

Scopus: 2-s2.0-85029702835
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URI
http://cer.ihtm.bg.ac.rs/handle/123456789/2211
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IHTM

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