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Four points function fitted and first derivative procedure for determining the end points in potentiometric titration
1Alexandria University, Faculty of Science, Chemistry Department, Horreya Avenue, P. O. Box 426, Ibrahimia, Alexandria 21321, Egypt. ShKh@Link.net
Summary
A novel differential method precisely determines endpoints in potentiometric titration curves. This new approach offers accurate results, outperforming existing methods for various titration curve types.
Area of Science:
- Analytical Chemistry
- Electrochemistry
Background:
- Potentiometric titrations are crucial for chemical analysis.
- Accurate endpoint determination is vital for reliable results.
- Existing methods may have limitations with complex titration curves.
Purpose of the Study:
- To introduce a new differential method for potentiometric titration endpoint determination.
- To evaluate the method's accuracy and performance against various factors.
- To compare the new method with established techniques.
Main Methods:
- A preprocessing step fits four data points to a non-linear function to find first derivative values.
- Inverse parabolic interpolation with an analytical solution locates the endpoint.
- Statistical evaluation includes linear least-squares validation and multifactor data analysis.
Main Results:
- The new method accurately determines endpoints for symmetrical and unsymmetrical potentiometric titration curves.
- It outperforms the 'parent' regular differential method across various factor levels.
- Results are comparable to true or estimated true endpoints and other established methods like Gran or Fortuin.
Conclusions:
- The developed differential method provides a robust and accurate approach for potentiometric titration endpoint determination.
- Its numerical procedures ensure reliable calculations for diverse titration curve shapes.
- This method offers a valuable alternative for precise chemical analysis.