Characterization of di(2-ethylhexyl)thiophosphoric acid by potentiometric titration and capillary zone electrophoresis

被引：0

作者：

A. Merkoçi

A. Sastre

J. L. Cortina

C. Maccà

机构：

[1] On leave from Department of Analytical Chemistry,

[2] Faculty of Natural Sciences,undefined

[3] Tirana University,undefined

[4] Tirana,undefined

[5] Albania,undefined

[6] Department of Chemical Engineering,undefined

[7] Universitat Politècnica de Catalunya,undefined

[8] E.T.S.E.I.B.,undefined

[9] Diagonal 647,undefined

[10] E-08028 Barcelona,undefined

[11] Spain,undefined

[12] Department of Inorganic,undefined

[13] Metallo-organic and Analytical Chemistry,undefined

[14] University of Padova,undefined

[15] Via Marzolo 1,undefined

[16] I-35131 Padova,undefined

[17] Italy,undefined

来源：

Fresenius' Journal of Analytical Chemistry | 1997年 / 358卷

关键词：

Titration; Pure Water; Quantitative Determination; Potentiometric Titration; Migration Time;

D O I：

暂无

中图分类号：

学科分类号：

摘要：

The acidity constant of di(2-ethylhexyl) thiophosphoric acid (DEHTPA) was investigated using potentiometric measurements with a pH glass electrode. Owing to the low solubility of DEHTPA in pure water, its concentration and acidity constants were determined by linearised pH-metric titration in 16.7% ethanol. A Ka value of (2.39±0.08)×10-4 was obtained. Quantitative determination of DEHTPA was performed by capillary zone electrophoresis (CZE) with carbonate buffer (pH 11.0) as a background electrolyte, operating at −20 kV with direct UV detection at 210 nm. The migration time was 8.97 min and the detection limit was 5 ppm.

引用

页码：489 / 492

页数：3