多波长线性回归分光光度法的应用（Ⅲ）─—邻苯二酚和对苯二酚体系的同时测定

STUDIES ON APPLICATION OF LINEAR REGRESSION ANALYSIS IN MULTIWAVELENGTH SPECTROPHOTOMETRY (Ⅲ)──SIMULTANEOUS DETERMINATION OF CATECHOL AND HYDROQUINONE

借助多波长数据线生回归分析法处理了结构和性质颇为相似、紫外吸收峰相差只有１３ｎｍ的苯二酚的两种同分异构体。选取波长区间为２６４～２８０ｎｍ范围内的９个波长点进行测定。结果表明，以Ａｔｉ／εｉ对εｉ／εｐ进行回归，在邻苯二酚与对苯二酚浓度比为１：１０～１０：１的范围内时，回归相关系数ｒ≥０．９９６３，回归线相对波动≤５．７％。邻苯二酚和对苯二酚的回收率分别为９９．０％～１０４．０％和９６．０％～１０１．０％，对于邻苯二酚、对苯二酚的标准混合液和模拟混合液的分析，结果较为满意。

The linear regression analysis for multiwavelength data was applied to determine simultaneously two mutual interfering isomers catechol (1, 2-benzenediol) and hydroquinone (1, 4-benzenediol). The difference between the ultraviolet absorption Peaks of their aqueous solutions, △λmax is only 13 um. The absorbance of the testing solution was measured at 9 wavelengths over the range of 264-280 um. The linear correlation coefficients(r) have been found to be greater than 0.9963 in the standard mixture solutions containing catechol and hydroquinone with molar ratio being from 1:10to 10:1. The recoveries of catechol and hydroquinone are 99.0%-104.0% and 96.0%-101.0%, respectively. The present method has been used to determine directly catechol and hydroquine in simulated samples with satisfactory results.