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研究发现:在pH=8的NaH2PO4-Na2HPO4的缓冲溶液中,邻苯二酚和间苯二酚都能明显的阻抑H2O2氧化灿烂甲酚蓝的褪色。但二者存在一定的速率差异,反应速率常数之比随时间而变化,且吸光度的加和性不佳。结合人工神经网络提出了1种能同时测定邻苯二酚和间苯二酚异构体的新方法。该方法无需预先分离或加入掩蔽剂等其他物质,最大限度保护样品不被破坏而较容易地直接进行有机物同分异构体的同时测定。本文研究了最佳反应和测定条件以及神经网络参数对网络性能的影响。并将该方法用于合成样品及水样中邻苯二酚和间苯二酚的测定,结果表明,精密度和准确度均满足分析要求。
The results showed that catechol and resorcinol significantly inhibited the fading of brilliant cresyl blue by H2O2 oxidation in a buffer solution of NaH2PO4-Na2HPO4 at pH = 8. However, there is a certain rate difference between the two, the ratio of reaction rate constant changes with time, and absorbance additivity is poor. A new method for simultaneous determination of catechol and resorcinol isomers was proposed based on artificial neural network. The method can measure the isomers of organics at the same time easily without isolating or adding other substances such as masking agent in advance, so as to protect samples to the maximum extent without breaking. In this paper, the effects of optimal reaction and measurement conditions and neural network parameters on network performance are studied. The proposed method was applied to the determination of catechol and resorcinol in synthetic samples and water samples. The results showed that both the precision and accuracy met the analytical requirements.