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

页码：295 / 301

页数：7

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