Development of a non-titration potentiometric method for the determination of acidity in vinegar

被引:2
作者
Oliveira, N. S. [1 ]
Oliveira, A. F. [1 ]
Neves, A. A. [1 ]
Queiroz, M. E. L. R. [1 ]
机构
[1] Univ Fed Vicosa, Dept Chem, BR-37560000 Vicosa, MG, Brazil
关键词
Acidity; Vinegar; Non-titrimetric potentiometric method; Buffering function; ACETIC-ACID; CAPILLARY-ELECTROPHORESIS; ACETATE; WATER;
D O I
10.1016/j.talanta.2023.124261
中图分类号
O65 [分析化学];
学科分类号
070302 ; 081704 ;
摘要
The acidity of a solution is associated with the concentration of Bronsted acids. This work proposes a new non-titrimetric potentiometric method using citrate buffer for the determination of vinegar acidity. The difference between the pH values before and after the addition of a diluted vinegar sample to 10 mmol L-1 citrate buffer (pH 5.5) was related to the acetic acid concentration. The dynamic range of the quadratic analytical curve was from 3.5 to 20 mmol L-1 (R2 = 0.998). The repeatability was 0.8% for acetic acid at 0.01 mol L-1. Comparison with the conventional titration method showed an error between 0.7% and 4.64% (n = 9) for analysis of commercial vinegar samples The behaviour of the system could be explained using the buffering function.
引用
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页数:6
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