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在酸性介质中,F e(Ⅲ)能够催化H2O2氧化中性红褪色反应,而对苯二酚和邻苯二胺都能阻抑该催化氧化褪色反应的速度。但二者存在一定的速率差异,且吸光度的加和性不佳。结合人工神经网络提出了一种能同时测定对苯二酚和邻苯二胺的新方法。研究了最佳反应和测定条件,结果表明:1.0×10-3m o.lL-1中性红溶液用量为0.8mL;30%H2O2用量为0.6mL;0.100g.L-1F e(Ⅲ)标准溶液用量为0.5mL;0.06m o.lL-1HC l用量为0.8mL;反应时间为6m in;反应温度为75℃时为最佳反应和测定条件。用于混合样品及河水中对苯二酚和邻苯二胺的测定,混合样品中对苯二酚和邻苯二胺回收率分别为95.6%—104.0%、97.8%—104.4%。河水中对苯二酚和邻苯二胺加标回收率均为105%,5次平行测定相对标准偏差分别为3.2%和2.5%。结果满意。
F e (Ⅲ) can catalyze the oxidation of neutral reddish fading reaction with H2O2 in acid medium, while both hydroquinone and o-phenylenediamine can inhibit the catalytic oxidation fading reaction. However, there is a certain rate difference between the two, and the sum of absorbance is not good. A new method for simultaneous determination of hydroquinone and o-phenylenediamine was proposed based on artificial neural network. The optimum reaction and determination conditions were studied. The results showed that the dosage of 1.0 × 10-3m o.lL-1 neutral red solution was 0.8mL, the amount of 30% H2O2 was 0.6mL, the dosage of 0.100gL-1F e (Ⅲ) 0.5mL; 0.06m o.lL-1HC l dosage of 0.8mL; reaction time was 6min; reaction temperature was 75 ℃ for the best reaction and determination conditions. For the determination of hydroquinone and o-phenylenediamine in mixed samples and river water, the recoveries of hydroquinone and o-phenylenediamine in the mixed samples were 95.6% -104.0% and 97.8% -104.4%, respectively. The recovery rates of hydroquinone and o-phenylenediamine in water were all 105%. The relative standard deviations of 5 parallel determinations were 3.2% and 2.5% respectively. Satisfactory results.