scholarly journals Determination of fluoride in spices using microwave induced oxygen combustion

2012 ◽  
Vol 81 (3) ◽  
pp. 319-323
Author(s):  
Emanuel Šucman ◽  
Jiří Bednář
Keyword(s):  
Ion Selective Electrode ◽  
Complete Sample ◽  
Selective Electrode ◽  
Straight Line ◽  
Relative Standard ◽  
Fluoride Determination ◽  
High Pressure Oxygen ◽  
Fluoride Ion Selective Electrode ◽  
Good Agreement

Fluorine is essential in human and/or animal nutrition; therefore, so it is important to know its concentration in a diet. One of the possible sources of fluorine for humans is spice, containing various amounts of this trace element. This work describes the method for fluoride determination in various kinds ofspices using microwave-supported sample preparation in high pressure oxygen atmosphere followed by potentiometry with a fluoride ion-selective electrode. Parameters of the microwave device for combustion procedure were checked and optimized in order to find settings ensuring complete sample combustion and/or absorption of the analyte in the absorption solution. For the ion-selective electrode measurement, the technique of standard straight line was chosen. Concentrations of fluorides in spices and spice blends under investigation ranged from 3.15 mg·kg-1 to 26.08 mg·kg-1. In order to check the accuracy of the method Certified Reference Material Fluoride in Vegetation NIST 2695 was used and a good agreement between certified and found values was found. The precision expressed as the relative standard deviation ranged from 0.6% to 5.0%. The method is fast, accurate and reliable for this kind of analysis. In recent literature data on fluoride concentrations in spices and/or spice blends have not been found.

scholarly journals  Determination of fluoride in plant material using microwave induced  oxygen combustion

2012 ◽  
Vol 30 (No. 5) ◽  
pp. 438-441 ◽  
Author(s):  
E. Šucman ◽  
J. Bednář
Keyword(s):  
Certified Reference Materials ◽  
Standard Addition ◽  
Ion Selective Electrode ◽  
Fluoride Ion ◽  
Selective Electrode ◽  
Relative Standard ◽  
Fluoride Determination ◽  
High Pressure Oxygen ◽  
Nernstian Slope ◽  
Fluoride Ion Selective Electrode

Fluorine is essential in human and/or animal nutrition, thus it is important to know its concentration in a diet. One of the important sources of fluorine for humans is tea, containing relatively high amounts of this trace element. A method for fluoride determination in various kinds of tea using microwave supported sample preparation in a high pressure oxygen atmosphere followed by potentiometry with a fluoride ion-selective electrode were described. The parameters of the microwave device for such combustion procedure were checked and optimised in order to find settings ensuring complete sample combustion and/or absorption of the analyte in the absorption solution. For the ion-selective electrode measurement, the technique of standard addition was chosen. The Nernstian slope of the fluoride ion-selective electrode was measured and calculated in the concentration range in which the potential of samples occurred. Concentrations of fluorides in tea in the range from 24.5 mg/kg to 254.5 mg/kg were found. In order to check the accuracy of the method certified reference materials were used. The precision expressed as the relative standard deviation ranged from 3.7% to 15.9%. The method is fast, accurate and reliable for this kind of analysis.  

Fluoride determination in various matrices relevant to nuclear industry: A review

2007 ◽  
Vol 95 (10) ◽  
Author(s):  
R. M. Sawant ◽  
M. A. Mahajan ◽  
Poonam Verma ◽  
Dipti Shah ◽  
U. K. Thakur ◽  
...  
Keyword(s):  
Nuclear Industry ◽  
Ion Selective Electrode ◽  
Nuclear Technology ◽  
Fluoride Ion ◽  
Selective Electrode ◽  
Experimental Parameters ◽  
Fluoride Determination ◽  
Reactor Materials ◽  
Fluoride Ion Selective Electrode

The determination of fluoride from diverse matrices at front and back end of nuclear technology and some studies from this laboratory on optimizations of different experimental parameters differing with multiple fuels and reactor materials, have been reviewed. The most useful techniques such as fluoride ion selective electrode (F-ISE) and ion-chromatography (IC) widely adopted as routine methods for fluoride determination in nuclear industry have been discussed. The effect of various buffer strengths on the response of the fluoride ion selective electrode has been examined. The ion chromatographic studies on mobile phase concentration, medium of sample, sample injection volume

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.

Titrimetric determination of cobalt, nickel and lanthanoids in alloys for novel permanent magnets using ion selective electrodes

1981 ◽  
Vol 46 (4) ◽  
pp. 982-986
Author(s):  
Dagmar Kalavská ◽  
Adam Košturiak ◽  
Svetozár Kalavský
Keyword(s):  
Permanent Magnets ◽  
Copper Ion ◽  
Ion Selective Electrode ◽  
Selective Electrode ◽  
Fluoride Ions ◽  
Cobalt Nickel ◽  
Back Titration ◽  
Titrimetric Determination ◽  
Fluoride Ion Selective Electrode

A procedure of chelatometric determination of cobalt, nickel and lanthanoids based on back titration with Cu(II) ions using copper ion selective electrode has been developed and applied to alloys for novel type permanent magnets. In addition, a method has been worked out for direct titrimetric determination of lanthanoids with solution of fluoride ions in 75% ethanol using fluoride ion selective electrode.

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
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