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
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页码：651 / 661
页数：11
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