高氯废水COD测定方法的研究

Rapid Determination of COD in High Chlorine Water Samples by Interpolation Correction Method

在标准曲线法基础上提出了一种测定高氯废水COD的新方法:氯离子加入法。在同一个水样中,加入不同浓度的氯离子,测定其COD值,再绘制COD-氯离子曲线,通过曲线的线性回归方程可准确计算出高氯废水的真实COD值。该方法不用加入催化剂和掩蔽剂,安全环保,且可有效避免由于水样基体而造成的干扰,使测定结果更加准确,适合于样品量较少的分析。

On the basis of standard curve method,a promising strategy,namely chloride ion addition method,was constructed using to determine the chemical oxygen demand(COD)in high chlorine wastewater.The strategy can be realized by three various steps,that is,firstly,the chloride ions with different concentrations were added into the same water sample,and then,the values of CODs were measured.Secondly,according to the obtained values,the COD-chloride ion curve can be effectively pictured.Finally,using the linear regression equation of the curve,the real value of COD for high chlorine wastewater could be accurately calculated.This strategy possesses some unique virtues,for example,without adding catalyst,safe and environmentally friendly,and so on.Moreover,it can effectively avoid the interference caused by the water sample matrix,leading to achieve more accurate results,which is suitable for the analysis of a small number of samples.