Title: Determination of citrate by potentiometric titration with copper(II) and a copper ion-selective electrode
Abstract: The potentiometric titration of citrate with copper(II) solution was studied at controlled pH in the concentration range 0.002–0.010 M. From measurements with a copper-selective electrode, it is concluded that the main reaction is 2 Cu2+ + 2HCit3 ⇌ Cu2(Cit)4−2 + 2 H+ with log β2–22 = 5.2 ± 0.1 when the titration is done at pH 6–8. The appropriate Gran function was derived and used to obtain equivalence volumes that agreed within 0.2– 0.4% with the theoretical values. Visual evaluation of the equivalence point from the titration curve gave less precise results; an automatic evaluation procedure (Metrohm Titroprocessor) gave results similar to those obtained with the Gran function. The influence of other complexing agents on the method was studied. A method for calibrating metal ion-selective electrodes is presented.
Publication Year: 1983
Publication Date: 1983-01-01
Language: en
Type: article
Indexed In: ['crossref']
Access and Citation
Cited By Count: 11
AI Researcher Chatbot
Get quick answers to your questions about the article from our AI researcher chatbot