Journal
TALANTA
Volume 227, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.talanta.2021.122190
Keywords
Fluorine; CaF; MIP-OES; Emission spectrometry; Tea; HR-GF MAS
Categories
Funding
- Ministry of Education
- University of Jeddah in Saudi Arabia
- Conselho Nacional de Desenvolvimento Cientifico e Tecnologico -CNPq
- ERASMUS +
- Royal Society of Chemistry Analytical Chemistry Trust Fund
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This study introduces a novel method for fluorine quantification using MIP-OES, with a detection limit of 1.1 mg/L via CaF measurements. The method was successfully applied to tea infusion samples, showing concentrations above the WHO recommended level for fluoride in drinking water.
This study presents a novel method for fluorine quantification determination by microwave-induced plasma optical emission spectrometry (MIP-OES). Due to the low temperature of this plasma, atomic emission of fluorine could not be measured, instead CaF molecular emissions were measured by using a calcium solution mixed in the spray chamber with the sample using a T-piece. Several wavelengths were studied to find the best signal to noise ratio for fluorine determination and 530.45 nm was chosen. The limit of detection for the determination of fluorine via CaF using MIP-OES was 1.1 mg L-1. A linear response was observed over two orders of magnitude (R-2 = 0.998). The developed method was applied to ten tea infusion samples from the UK and Saudi Arabia. The results were not significantly different (paired Student's t-test, p = 0.97) to the results obtained using the reference method, high-resolution continuum source graphite furnace molecular absorption spectrometry (HR-GF MAS). The total fluorine in the tea infusions varied between 2.7 and 7.8 mg L-1; all of which were above the WHO recommended level of fluoride (0.8-1.5 mg L-1) in drinking water. This method can potentially be used for total fluorine determination and might be useful for fluorine speciation analysis when coupled with HPLC.
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