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| نشریه دانشکده فنی | ||
| مقاله 16، دوره 20، شماره 0 - شماره پیاپی 1000200، مهر 1350 اصل مقاله (300.8 K) | ||
| نویسنده | ||
| الیده سرابی* | ||
| عنوان مقاله [English] | ||
| THE PRINCIPLE OF DEAD STOP END POINT TITRATIONS | ||
| چکیده [English] | ||
| A Dead Stop End Point titration is a type of amperometric titration which makes use of two identical electrodes (usually made of Platinum) with a small potential difference between them. The first titration of this type was carried out by Salomon in 1897, but the method only came in general use after it was rediscovered in 1926 by Foulk and Bawden. During these titrations the current is measured as a function of the degree of neutralization. At the end point the current is zero, and depending on the substances present in the solution, the current is sometimes also zero before or after the equivalence point. The proper explanation of these titration curves has long been a major difficulty. Only in the last two decades it was realized that there is a relation with electrode kinetics. A current can only flow if both components of a reversible oxidation - reduction couple are present in the solution in which the electrodes are immersed. In this paper the polarization curves of reversible and irreversible redox couples are briefly discussed. After that it is demonstrated how the different types of titration curves can be derived from these polarization curves. | ||
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