Determination of Total and Fluoride Bound Aluminium in Tea Infusions by Ion Selective Electrode and Flame Atomic Absorption Spectrometry

Erdemoğlu, Sema; Türkdemir, Haluk; Güçer, Şeref

doi:10.1080/00032710008543140

Cited by 16 publications

(7 citation statements)

References 14 publications

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“…The molar ratio between Al and Fin infusions, which is greater than 1, is consistent with previous studies from Brazil [25] and China [26]. Moreover, an Al: Fmolar ratio greater than 1 is evident if comparing the results of the studies in which either For Al concentrations in infusions were determined [13,[15][16][17][18][19][20][21][22][23]. Our results, however, contradict those reported in Europe, where an Al: Fmolar ratio of less than 1, i.e., 0.59, was reported The data presented in Figure 3 support the categorisation of teas based on their Al and/or Fconcentrations in infusions with respect to their packaging into two groups.…”

Section: Relationship Between Fluoride and Aluminium Concentrations I...supporting

confidence: 90%

“…The results presented in Table 2 show that the concentration of Fand Al in infusions ranges from 0.34-4.79 mg/L and 0.51-8.90 mg/L, respectively. The determined concentrations are in agreement with previously published results for tea available in Europe [13,[15][16][17][18][19][20][21][22][23]. The average concentrations of both elements in infusions of tea, categorised by type and packaging, follow the same descending order: black filter > green filter > black leaves ≈ green leaves (Figure 1).…”

Section: Fluoride and Aluminium Concentrations In Infusions With Resp...supporting

confidence: 90%

“…In general, the Fconcentration in infusions of tea available in Europe typically ranges between 0.31 and 8.9 mg/L [15][16][17][18][19]. The Al concentration is higher, and can reach up to 20 mg/L [13,[20][21][22][23]. Comparable concentrations are also reported in sparse studies investigating both Fand Al concentrations in infusions [24][25][26][27].…”

Section: Introductionmentioning

confidence: 99%

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Fluoride and Aluminium in Tea (Camellia sinensis L.)—Tea Quality Indicators and Risk Factors for Consumers

Pavlovič,

Tavčar,

Ponikvar-Svet

2023

Molecules

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In recent years, the quality and sourcing of tea have gained importance in Europe, but information remains scarce. The aim of this study was to determine the concentrations of fluoride (F–) and total aluminium (Al) species in infusions of commercially available teas in Slovenia, and thus in Europe, and to relate them to tea quality and their impact on consumer safety. F– concentrations were determined using a fluoride-ion-selective electrode and Al concentrations using inductively coupled plasma optical emission spectroscopy. A comparison of the results obtained for four selected tea samples using the calibration curve and a standard addition technique showed good agreement, with no interferences caused by the sample matrix. The concentrations of 35 commercial teas ranged from 0.34 to 4.79 and 0.51 to 8.90 mg/L for F– and Al, respectively. The average concentrations of the two elements followed the same descending order: black filter > green filter > black leaves ≈ green leaves. Single and multivariate statistical methods supported the categorisation of teas by packaging but not by type, with tea in filter bags being more expensive than loose tea. The linear relationship between F– and Al concentrations in infusions (C(Al) = 1.2134 · C(F–)) allows for the determination of one element and estimation of the other, leading to a significant reduction in laboratory effort and cost. This research advances tea assessment by proposing Al concentration alongside F– as a quality indicator and provides the basis for tea-monitoring protocols. Finally, the daily consumption of larger quantities of tea (≈1 L) with elevated F– and Al concentrations could potentially pose a health risk.

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Section: Relationship Between Fluoride and Aluminium Concentrations I...supporting

confidence: 90%

Section: Fluoride and Aluminium Concentrations In Infusions With Resp...supporting

confidence: 90%

Section: Introductionmentioning

confidence: 99%

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Fluoride and Aluminium in Tea (Camellia sinensis L.)—Tea Quality Indicators and Risk Factors for Consumers

Pavlovič,

Tavčar,

Ponikvar-Svet

2023

Molecules

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“…Speciation and aqueous availability of fluoride in water is the function of pH, concentration, and the presence of cations such as: Al 3+ , Fe 3+ , Mn 2+ , Ca 2+ , and Mg 2+ [21]. At low pH values of 4 and less, for example, the molecular HF fluoride species predominates aqueous fluoride speciation in solution.…”

Section: Effects Of Phmentioning

confidence: 99%

Fluoride Adsorption onto Soil Adsorbents: The Role of pH and Other Solution Parameters

Wambu¹,

Kurui²

2019

Soil pH for Nutrient Availability and Crop Performance

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Soil adsorbents continue to attract increasingly high numbers of researchers in water defluoridation studies. An aspect of solution parameters, that is the aqueous adsorption of fluoride onto soil adsorbents in defluoridation studies, has been reviewed and reported. The pH was found to be the main factor controlling fluoride adsorption on the popular soil adsorbents including: aluminosilicates, iron (hydr)oxides, aluminum (hydr) oxides, apatites, carbonaceous minerals, calcareous soils and zeolites and the other key parameters being temperature, time of contact, and co-existent ions. Fluoride adsorption onto metal-exchanged zeolites and hydroxyapatites (optimum pH = 4-10), iron (hydro) oxide minerals (pH = 2-7), and carbonaceous minerals (pH = 4-12) is relatively pHindependent, and high amounts of fluoride are able to sorb upon the surfaces of these minerals in a wide range of pH values. However, montmorillonites (optimum pH = 5-6), aluminum (hydro)oxide minerals (pH = 5-7), and calcareous minerals (pH = 5-6) only sorb significant amount of fluoride in a narrow range of pH values. The fluoride adsorption onto the latter class of minerals, also generally occurring at slightly above room temperatures, appears to be highly specific and not strongly affected by the presence of coexistent anions including: PO 4 3− , SO 4 2− , Cl − , and NO 3 − .

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“…201 The study employed a rapid and sensitive analytical procedure for uranium isotopic ratio measurement based on ICP-quadrupole MS with a hexapole collision cell (HEX-ICP-QMS). Also, in a similar study, the concentrations and isotopic ratios of 239 Pu 240 Pu in soils collected from the Chernobyl 30 km zone were determined by ICP-MS. 202 An analytical method has been developed for the measurement of Mg isotope ratios and determination of Mg concentration in 26 Mg spiked plant nutrient solutions by the reverse isotope dilution technique. 203 The Mg concentrations were determined by ICP-OES and ICP-MS with external calibration and the measured values were in agreement with the results obtained by the reverse isotope dilution technique.…”

Section: Icp-msmentioning

confidence: 99%

Atomic spectrometry update. Environmental analysis

Hill

Arowolo

Butler

et al. 2002

J. Anal. At. Spectrom.

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This is the twentieth annual review published in JAAS of the application of atomic spectrometry to the chemical analysis of environmental samples. In the analysis of air, there is ongoing development of instrumentation for continuous emission monitoring and as a means of interrogating the composition of individual airborne particulates. Developments in mass spectrometry applications continue to be an active area of research where the advantages of low detection limits and abilities to perform isotopic measurements are being exploited. There is growing interest in performing speciation measurements in water and this is being aided by the development of hyphenated techniques, most notably via the coupling of chromatographic systems to ICP-MS. Dominant themes in the analysis of soils include the optimization of preconcentration (and matrix separation) techniques, development of speciation protocols, notably arsenic and the increased use of portable XRF systems for in situ analysis. In geological analysis, laser ablation as an analytical tool is attracting a wider audience. Multi-collector ICP-MS is increasingly being used in a number of geological facilities to perform high precision isotope ratio measurements.

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Determination of Total and Fluoride Bound Aluminium in Tea Infusions by Ion Selective Electrode and Flame Atomic Absorption Spectrometry

Cited by 16 publications

References 14 publications

Fluoride and Aluminium in Tea (Camellia sinensis L.)—Tea Quality Indicators and Risk Factors for Consumers

Fluoride and Aluminium in Tea (Camellia sinensis L.)—Tea Quality Indicators and Risk Factors for Consumers

Fluoride Adsorption onto Soil Adsorbents: The Role of pH and Other Solution Parameters

Atomic spectrometry update. Environmental analysis

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