scholarly journals Comparison of Different Total Ionic Strength Adjustment Buffer Compositions for Determination of Low Level Fluoride in Environmental Water Samples with Fluoride Ion Selective Electrode

2021 ◽  
Author(s):  
Tedlaye Forsido ◽  
Peter Ndibewu
Keyword(s):  
Ionic Strength ◽  
Water Samples ◽  
Environmental Water ◽  
Fluoride Content ◽  
Ion Selective Electrode ◽  
Environmental Water Samples ◽  
Fluoride Ion ◽  
Selective Electrode ◽  
Total Ionic Strength ◽  
Fluoride Ion Selective Electrode

Abstract Background Fluoride content of environmental water samples collected from the vicinity of Pilanesberg National Park was determined using a fluoride ion selective electrode (F−ISE). Different total ionic strength adjustment buffers (TISABs) EDTA, CDTA, Citrate and Acetate buffers, were compared for their effectiveness in releasing fluorine into the solution in its ionic form, by adjusting the pH and ionic strength of the solution, as well as by chelating polyvalent cations present in the samples. Nine water samples were collected from different sites around the park, where there is a decommissioned fluorspar mine, and an extinct volcano; for fluoride content. Quantification was carried out by means of multipoint calibration covering the range of interest in all treatments. Result The fluoride concentration was calculated using the Nernest equation with values obtained from the calibration graph. It was found that CDTA and EDTA buffers were the best TISABs as they produced a better linearity, slope and recovery in that order, where as the other acetate also produced better parameters and results than the untreated water samples. Conclusion CDTA and EDTA TISAB solutions perform better than the others for fluoride content determination from environmental water samples.

Determination of Fluoride Content in Tea Infusions Sold in Karachi Using Fluoride Ion Selective Electrode

2017 ◽  
Vol 7 ((1-4)) ◽  
pp. 8
Author(s):  
Zia ul Arefin ◽  
Tehseen Ahmed ◽  
Sana Imran ◽  
M. Asad Khan Tanoli ◽  
Zahid Khan
Keyword(s):  
Fluoride Content ◽  
Ion Selective Electrode ◽  
Fluoride Ion ◽  
Selective Electrode ◽  
Tea Infusions ◽  
Fluoride Ion Selective Electrode

scholarly journals Determination of fluoride content in drinking water and tea infusions using fluoride ion selective electrode

2007 ◽  
Vol 52 (2) ◽  
pp. 155-168 ◽  
Author(s):  
Milos Rajkovic ◽  
Ivana Novakovic
Keyword(s):  
Drinking Water ◽  
Mineral Waters ◽  
Fluoride Content ◽  
Ion Selective Electrode ◽  
World Health ◽  
Fluoride Ion ◽  
Selective Electrode ◽  
Fluoride Ions ◽  
Fluoride Ion Selective Electrode

Potentiometric analysis of fluoride content (as F- ion) in solutions by using fluoride ion-selective electrode is simple, reliable and cheap. Very small concentrations of fluoride-ions (to 10-6 mol/dm3) can be determined by fluoride selective electrode, with regulation of ion strength of a solution and control of concentration of hydroxide ions and interfering ions of metals. The influence of pH and complexing ions of metals can be successfully regulated by the TISAB solution and by preserving pH value in the range from 5.00 to 7.00. The content of fluorides in the samples can be determined by the method of direct potentiometer, and in the case of very low concentration by standard addition method. In this paper it was analyzed the determination of fluoride ions concentration in bottled mineral waters and water from Belgrade plumbing in two Belgrade districts (Palilula and Novi Beograd) and in tea, by using the fluoride selective electrode. It was determined that the content of fluoride ions in bottled mineral water significantly differs from values given on declaration, and that content of fluoride ions varies over a period of time. The content of fluoride ions in water from plumbing in two Belgrade districts at the time of analysis was significantly increased and exceeded values given in Regulation for drinking water quality. The received results from the analysis of fluorides in teas show that fluorides exist in teas in different concentrations. There are also differences between the same kinds of tea, which is noted with mint (Mentha piperitae folium), as a consequence of differences between soils where it was planted. As taking of fluorides, according to World Health Organisation recommendation (WHO), is limited in the range from 2 to 4 mg per day, it is necessary to give the content of fluorides on all products that are used in human consumption.

Determination of inorganic fluoride in blood with a fluoride ion-selective electrode.

1987 ◽  
Vol 33 (2) ◽  
pp. 253-255 ◽  
Author(s):  
E Kissa
Keyword(s):  
Whole Blood ◽  
Fluoride Concentration ◽  
Ion Selective Electrode ◽  
Fluoride Ion ◽  
Inorganic Fluoride ◽  
Selective Electrode ◽  
Cell Potential ◽  
Novel Method ◽  
Fluoride Ion Selective Electrode

Abstract Inorganic fluoride in whole blood, serum, or plasma has been determined with a fluoride ion-selective electrode by adding the 0.5- to 2.0-mL sample to 20 mL of water containing a buffer and fluoride, 25 micrograms/L. The fluoride concentration in the sample is calculated from the resulting cell potential difference recorded after equilibrating for 10 min. This novel method has the advantages of simplicity, accuracy, and high precision, standard deviations for 5 to 7 replicate determinations of fluoride ranging from +/- 1.7 to +/- 2.4 micrograms/L. For whole blood from donors living in an area with fluorinated drinking water, the F- concentration was 20 to 60 micrograms/L.

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