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中文摘要：
分别用渐进因子分析（evolving factor analysis，EFA）和SIMPLISMA（Simple—to—use interactive self—modeling mixture analysis）并结合交替最小二乘法（alter least—squares，ALS）计算4-（2-吡啶偶氮）-间苯二酚（PAR）的光谱滴定数据，分辨出PAR在pH0—14水溶液中各形态的分布曲线，测得PAR各级电离常数分别为pKa1=2．96、pKa2=5．45、pKa3=12．01。该法用于电离常数的测定，能避免各形态共存时的相互干扰，测定结果令人满意。
英文摘要：
Evolving factor analysis （EFA） and Simple - to - use interactive self - modeling mixture analysis （ SIMPLISMA） combined with alter least- squares （ALS） respectively were used to calculate the spectroscopic titration datum of 4 - （2 -pyridilazo） -resorcinol （PAR）, the distribution curve of all forms of PAR in water were resolved at pH 0 to 14 ,the determined constants of PAR were pKa1 = 2.96,pKa2 = 5.45 and pKa3 = 12.01. These methods can be used to eliminate the interference of coexisted compounds in determination of ionization constant, the results are satisfactory.
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