The use of microwave-induced plasma optical emission spectrometry for fluorine determination and its application to tea infusions

被引:12
作者
Akhdhar, Abdullah [1 ,2 ]
Schneider, Mauana [1 ,3 ]
Hellmann, Steffen [1 ]
Orme, Alice [1 ]
Carasek, Eduardo [3 ]
Krupp, Eva M. [1 ]
Feldmann, Joerg [1 ,4 ]
机构
[1] Univ Aberdeen, Dept Chem, Trace Element Speciat Lab Aberdeen TESLA, Aberdeen AB24 3UE, Scotland
[2] Univ Jeddah, Coll Sci, Dept Chem, Jeddah, Saudi Arabia
[3] Univ Fed Santa Catarina, Dept Quim, BR-88040900 Florianopolis, SC, Brazil
[4] Karl Franzens Univ Graz, Inst Chem, TESLA Environm Analyt Chem, A-8010 Graz, Austria
关键词
Fluorine; CaF; MIP-OES; Emission spectrometry; Tea; HR-GF MAS; ELECTROTHERMAL VAPORIZATION; HUMAN EXPOSURE;
D O I
10.1016/j.talanta.2021.122190
中图分类号
O65 [分析化学];
学科分类号
070302 ; 081704 ;
摘要
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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页数:5
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