Microdetermination and pK/sub a/ measurement of some aliphatic amines using the copper-ion-selective electrode

Journal Article · Thu Jan 01 04:00:00 EST 1981 · Microchem. J.; (United States)

DOI:https://doi.org/10.1016/0026-265X(81)90121-1· OSTI ID:6165533

Hassan, S S.M. ^[1]; Tadros, F; Selig, W

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1. Ain Shams Univ., Cairo, Egypt

Aliphatic amines were determined on the microscale by potentiometric titration with standard cupric sulfate solution in aqueous or partially aqueous (methanolic) medium. Electromotive forces were monitored with a copper-ion-selective electrode or a graphite rod impregnated with silver sulfide/cupric sulfide, and a double-junction reference electrode. Monoamines and diamines up to 1,3-diaminopropane reacted on a 2:1 amine:Cu basis. Diamines from 1,4-diaminobutane to at least 1,7-diaminoheptane reacted on an equimolar basis. The dissociation constants of some of the amines were determined. A linear relationship exists between the emf at half complexation and the dissociation constants of the amines tested. 2 figures, 4 tables.

• DOE Contract Number: W-7405-ENG-48
• OSTI ID: 6165533
• Journal Information: Microchem. J.; (United States), Journal Name: Microchem. J.; (United States) Vol. 26; ISSN MICJA
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400102* -- Chemical & Spectral Procedures
AMINES
CHEMICAL ANALYSIS
ELECTROMOTIVE FORCE
ORGANIC COMPOUNDS
POTENTIOMETRY
QUANTITATIVE CHEMICAL ANALYSIS
TITRATION