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Ion selective electrode potentiometry

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  1. Abstract
  2. Introduction
  3. Theory
  4. Experimental procedure
  5. Results/ discussion
  6. Conclusion
  7. References

The use of ISEP offers great selectivity in the determination of trace elements. With the utilization of a fluoride ion selective electrode, the concentration within the unknown sample were determined to be approximately 0.0423 +/- 3.5x10-4 mol/L. (Standard deviation = 4.58 x 10-4) In comparison to the ideal Nernst relation, the responses derived did not directly obey the function. This may tend to suggest several alternate interactions within the use of ion selective electrode potentiometry

[...] The ion selective electrode, although sensitive to specific ions, are not completely selective. Depending on the varying quantities of these compounds and the properties of the system, (temperature, pressure, etc) these ions can interact with the electrode in a manner similar to the analyte.(Rundle, 2007) In order to compensate for this undesirable interaction, a selectivity coefficient is utilized. This relation is used as a means to determine the relative interactions of these ions and account for their presence. In this particular analysis, the inclusion of interfering ions is relatively minimal. [...]

[...] (Rundle, 2007) A slight drift within the experimental values was also observed throughout the investigation. Between each subsequent measurement of equivalent samples, the potentials displayed tended to increase. This increase within the data would indicate a gradual reduction in the concentration of the sample. Although this effect could potentially be cause by mechanical discrepancies, it is most likely the consequence of potential drift. Potential drift can occur between subsequent measures of equivalent solutions. As the electrodes are immersed within the sample solutions, they require rinsing between measurements. [...]

[...] These electrodes are ideal for the analysis of dissolved gases as well as gaseous samples. (Harris, 2007) Experimental Procedure: A specified TISAB solution had been prepared prior to the analysis. This solution was prepared by the addition of approximately 500ml of deionized water to a 1000ml beaker, as well as the incorporation of 58g of sodium chloride, 12g of sodium citrate dihydrate, and lastly 57ml of glacial acetic acid. The solution was mixed until all components were dissolved, and was subsequently cooled. [...]

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