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速差动力学分析是利用2种性质不同的离子与显色剂反应速度不同进行测定的分析方法.目前各种废水中Fe(Ⅲ)、Cr(Ⅲ)共存的情况较为多见,测定时互有干扰.二甲酚橙与Fe~(3+)、Cr~(3+)作用形成的2种配合物具有相似的吸光特性,但生成速率有显著差异.铁与二甲酚橙在室温下反应迅速,而且随温度升高其吸光度几乎不变,而铬与二甲酚橙在室温下几乎不发生反应,加热才有明显反应.据此本文同时测定了铬、铁混合物.该方法快速简便,最低检出限0.1μg/mL,回收率95％～106％.利用本法可监测印染废水中的铬、铁离子.
Differential kinetic analysis is the use of two different properties of different ions and reagent reaction rate was determined by different analytical methods.At present, a variety of wastewater Fe (Ⅲ), Cr (Ⅲ) the coexistence of more common cases, each measured There are interferences.The two complexes formed by xylenol orange and Fe ~ (3 +) and Cr ~ (3+) have similar absorption characteristics, but there are significant differences in the formation rate between xylenol orange and xylenol orange at room temperature The reaction is rapid and the absorbance hardly changes with the increase of temperature, while the reaction between chromium and xylenol orange hardly occurs at room temperature, and the reaction has obvious reaction.At the same time, the method for determination of chromium and iron is rapid and easy , The detection limit of 0.1μg / mL, the recovery rate of 95% ~ 106%. The use of this method can monitor the printing and dyeing wastewater chromium and iron ions.