pH-Metric method for acid number determination in hydraulic oils without titration

被引：6
|
作者：
Strochkova, E [1 ]
Tur'yan, YI [1 ]
Kuselman, I [1 ]
机构：
[1] Natl Phys Lab Israel, IL-91904 Jerusalem, Israel
来源：
TALANTA | 1999年 / 50卷 / 05期
关键词：
acid number; pH-metry; hydraulic oils; metrological parameters;
D O I：
10.1016/S0039-9140(99)00192-7
中图分类号：
O65 [分析化学];
学科分类号：
070302 ; 081704 ;
摘要：
A heptane-mediated extraction of acids from hydraulic oils is proposed for pH-metric acid number determination without titration. The acids are extracted in the reagent consisting of triethanolamine and potassium nitrate dissolved in water and isopropanol. The use of heptane allows us to overcome the influence of additives in the hydraulic oil on the glass electrode. Simultaneously the extraction of acids from the oil into the water-isopropanol phase is simplified. The method is validated and suitable metrological characteristics of the acid number determination are obtained. Published by Elsevier Science B.V.
引用
收藏
页码：1135 / 1139
页数：5
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