Errors in the gran addition method: Experimental determination of errors by means of a fluoride-selective electrode

✍ Scribed by N. Parthasarathy; J. Buffle; D. Monnier

• Publisher: Elsevier Science
• Year: 1972
• Tongue: English
• Weight: 425 KB
• Volume: 59
• Category: Article
• ISSN: 0003-2670
• DOI: 10.1016/0003-2670(72)80013-8

✦ Synopsis

The importance of the possible errors in the Gran plot method which are reported here, has not been studied before, although several authors have used this method l-3. In Part I of this series4 the errors introduced by various parameters in the addition technique were discussed and a theoretical evaluation of the titration conditions to achieve maximal precision in the determination of the unknown concentration was described. In order to verify the theory, cxpcriments were performed with a fluoride-selective electrode.

EXPERIMENTAL

Apparatus

A Beckman fluoride-selective electrode and a reference saturated calomel electrode were used with a Metrohm digital pH-meter. All measurements were made at 23 +O.l" in a polyethylene beaker. The solutions were stirred magnetically during the measurements.