PH-DEFINING EQUILIBRIUM BETWEEN WATER AND SUPERCRITICAL CO2 - INFLUENCE ON SFE OF ORGANICS AND METAL-CHELATES

被引：353

作者：

TOEWS, KL

SHROLL, RM

WAI, CM

SMART, NG

机构：

[1] UNIV IDAHO,DEPT CHEM,MOSCOW,ID 83844

[2] BRITISH NUCL FUELS PLC,SPRINGFIELDS WORKS,CO RES LAB,PRESTON PR4 OXJ,LANCS,ENGLAND

来源：

ANALYTICAL CHEMISTRY | 1995年 / 67卷 / 22期

关键词：

D O I：

10.1021/ac00118a002

中图分类号：

O65 [分析化学];

学科分类号：

070302 ; 081704 ;

摘要：

A direct measurement of the pH of water in contact with supercritical CO2 was made by observing the spectra of a pH indicator with a UV-vis spectrophotometer. The pH was analyzed under pressures of 70-200 atm and temperatures of 25-70 degrees C, The measured pH varied from 2.80 to 2.95, and relative standard deviations of <1.5% were achieved, The effects of pH on the efficiency of supercritical fluid extraction of metals and ionizable organic species in water-containing systems are discussed.

引用

页码：4040 / 4043

页数：4

共 26 条

[1] COMPARISON OF SUPERCRITICAL-FLUID EXTRACTION AND LIQUID-LIQUID-EXTRACTION FOR ISOLATION OF SELECTED PESTICIDES STORED IN FREEZE-DRIED WATER SAMPLES [J].