MEASUREMENT OF PH AT ELEVATED-TEMPERATURES USING THE OPTICAL INDICATOR ACRIDINE

被引：18

作者：

HUH, Y ^{[1
]}

LEE, JG ^{[1
]}

MCPHAIL, DC ^{[1
]}

KIM, K ^{[1
]}

机构：

[1] MONASH UNIV,DEPT EARTH SCI,VICTORIAN INST EARTH & PLANETARY SCI,CLAYTON,VIC 3168,AUSTRALIA

来源：

JOURNAL OF SOLUTION CHEMISTRY | 1993年 / 22卷 / 07期

关键词：

OPTICAL INDICATOR; PH; ACID DISSOCIATION CONSTANT; ACRIDINE; BENZOIC ACID;

D O I：

10.1007/BF00646784

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

A new method of measuring the pH of high-temperature aqueous solutions using optical indicators was developed. The absorbance spectrum of acridine changes as a function of pH, allowing its use as an optical indicator for pH. The PK(a) of acridine were experimentally determined in KOH-AcOH pH-buffer solutions at temperatures from 5 to 250-degrees-C at vapor-saturated pressures : pKa = 5.62 + 1158 / T - 0.7168 lnT where T is in Kelvin. The technique is demonstrated by experimentally determining the pKa of benzoic acid at temperatures up to 250-degrees-C where the result was pKa (benzoic acid) = - 60.67 + 3069 / T + 9.5542 lnT

引用

页码：651 / 661

页数：11

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