Flow Injection Potentiometric Determination of Coke Acidity and Acetic Acid Content in Vinegar Using an Antimony Electrode
作者:
MiltonDuffles Capelato,
AntoniaMarli dos Santos,
Orlando Fatibello-Filho,
Romualdo Gama,
期刊:
Analytical Letters
(Taylor Available online 1996)
卷期:
Volume 29,
issue 5
页码: 711-724
ISSN:0003-2719
年代: 1996
DOI:10.1080/00032719608001778
出版商: Taylor & Francis Group
关键词: flow analysis;antimony electrode;pH sensor;potentiometric detector acidity
数据来源: Taylor
摘要:
A flow injection potentiometric procedure is proposed for the determination of acidity of several samples using an antimony/ antimony oxide electrode. The ΔE/pH curve in phosphate buffer solutions in the pH range from 1.58 to 12.00 showed a linear sub-Nernstian behavior with an operational slope S =-42.1mV/pHcand a conditional standard potential of 264.8mV. This flow potentiometric electrode responds linearly to low acidity variations of dilute acetic acid solutions from 3.16 to 100mM with a slope of 30.1mV/dec and analytical frequency of 23 results/h. Good reproducibility and an average standard deviation of ±0.5% was obtained. The application of this sensor for the determination of coke acidity and acetic acid in vinegar is reported.
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