Lower limits of the potentiometric titration of perchlorate using a perchlorate ion-selective electrode

Journal Article · Fri Dec 31 23:00:00 EST 1976 · Microchem. J.; (United States)

DOI:https://doi.org/10.1016/0026-265X(77)90001-7· OSTI ID:7298653

Selig, W

Three titrants (tetraphenylarsonium chloride, tetraphenylphosphonium chloride, and tetra-n-pentylammonium bromide) were evaluated for the potentiometric determination of perchlorate. The emf levels were monitored with a perchlorate ion-selective indicator electrode and a double-junction reference electrode. The tetraphenylonium salts were equivalent, yielding the same precision and magnitude of potentiometric breaks. Considerably smaller breaks were obtained with tetra-n-pentylammonium bromide, which, therefore, is not recommended as titrant. The lower limits for the potentiometric titration of perchlorate at ambient temperature were extended to approximately 0.09 mmol per 50 ml (1.7 x 10/sup -3/ N) from the previous 0.25 mmol per 50 ml. If Gran plots are used, they can be further extended to approximately 0.01 mmol per 50 ml (2.1 x 10/sup -4/ N).

• Research Organization: Univ. of California, Livermore
• OSTI ID: 7298653
• Journal Information: Microchem. J.; (United States), Journal Name: Microchem. J.; (United States) Journal Issue: 1 Vol. 22; ISSN MICJA
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201* -- Chemical & Physicochemical Properties
AMMONIUM COMPOUNDS
ARSENIC COMPOUNDS
ARYL RADICALS
CHEMICAL ANALYSIS
CHLORINE COMPOUNDS
HALOGEN COMPOUNDS
OXYGEN COMPOUNDS
PERCHLORATES
PHENYL RADICALS
PHOSPHORUS COMPOUNDS
POTENTIOMETRY
QUANTITATIVE CHEMICAL ANALYSIS
RADICALS
TITRATION