人工神经网络动力学光度法同时测定烟草中的Cr3+,Al3+和Fe3+

摘要

A method for simultaneous determining of chromium ( Ⅲ ) , aluminum ( Ⅲ ) and iron ( Ⅲ ) by catalytic kinetic spectrophotometry was realized based on the principle that Cr ( Ⅲ ) Al ( Ⅲ ) and Fe ( Ⅲ ) catalyzing simultaneously the reaction of brilliant cresyl blue with hydrogen peroxide in a CH3COONa CH3COOH medium.It was found that the catalytic effects of the three metal ions were not synergistic.The recoveries of the method ranged from 97.9％ to 101.9％ with the RSDs of 2.7％ to 4.2％ and relative errors of -4.3％ to 4.7％.%根据在CH3COONa-CH 3COOH介质中Cr3+,Al3+'和Fe3+同时催化H2O2氧化灿烂甲酚蓝褪色的催化反应原理,建立了一种可同时测定烟草中Cr3+,Al3+和Fe3+的人工神经网络催化动力学光度法.结果表明:①Cr3+,Al3+和Fe3+对H2O2氧化灿烂甲酚蓝褪色反应催化作用不具有加和性;②该方法的相对误差为-4.3%～4.7%,回收率97.9%～101.9%,RSD 2.7%～4.2%.