Flow Injection Potentiometric Determination of Coke Acidity and Acetic Acid Content in Vinegar Using an Antimony Electrode
| Autor: | Milton Duffles Capelato, Romualdo Gama, Orlando Fatibello-Filho, Antonia Marli dos Santos |
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| Rok vydání: | 1996 |
| Předmět: |
Biochemistry (medical)
Clinical Biochemistry Potentiometric titration Inorganic chemistry chemistry.chemical_element Coke Biochemistry Analytical Chemistry Acetic acid chemistry.chemical_compound Antimony chemistry Standard electrode potential Electrode Electrochemistry Antimony oxide Quantitative analysis (chemistry) Spectroscopy |
| Zdroj: | Analytical Letters. 29:711-724 |
| ISSN: | 1532-236X 0003-2719 |
| Popis: | 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/pHc and 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. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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