Abstract
A potentiometric back-titration method for the determination of sulfate ions using a plasticized poly(vinyl chloride) membrane electrode without added ion-exchanger is described. A solution of a derivative of tetraphenylborate is used as titrant. The method is based on the ion association between an excess of 2-aminoperimidinium added to the sulfate containing sample and the tetraphenylborate derivative in the titrant. The titration end-point is detected as a sharp potential change due to an increase in the concentration of the free tetraphenylborate derivative at the equivalence point. The sharpness of the titration curve at the end-point is compared for two tetraphenylborate derivatives. Good results are obtained with a solution of sodium tetrakis (4-fluorophenyl) borate.
Original language | English |
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Pages (from-to) | 423-425 |
Number of pages | 3 |
Journal | Fresenius' Journal of Analytical Chemistry |
Volume | 362 |
Issue number | 4 |
DOIs | |
Publication status | Published - 1998 |
Externally published | Yes |
ASJC Scopus subject areas
- Biochemistry