pH-metric determination of acid values in vegetable oils without titration

被引：49
|
作者：
Turyan, YI [1 ]
Berezin, OY [1 ]
Kuselman, I [1 ]
Shenhar, A [1 ]
机构：
[1] HEBREW UNIV JERUSALEM,NATL PHYS LAB,IL-91904 JERUSALEM,ISRAEL
来源：
JOURNAL OF THE AMERICAN OIL CHEMISTS SOCIETY | 1996年 / 73卷 / 03期
关键词：
acid value; conditional pH; isopropanol; pH-metry; titration; triethanolamine; vegetable oils;
D O I：
10.1007/BF02523422
中图分类号：
O69 [应用化学];
学科分类号：
081704 ;
摘要：
A new method for determining acid values in vegetable oils has been developed for a nontitration pH-metric technique with a reagent consisting of 0.20 M triethanolamine in a 1:1 solution of water and isopropanol. The emulsive properties of this reagent provide rapid (within a minute) and quantitative extraction of free fatty acids from an oil into the solvent phase. Acid values were determined by measuring conditional pH of the emulsified reagent in a pH-meter with an aqueous reference electrode. Three different applications of this technique are discussed.
引用
收藏
页码：295 / 301
页数：7
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