应用改进分光光度法测定多组分水样的COD

提出改进分光光度法测定多组分水样的化学需氧量(COD)。以多种物质的吸光曲线回归方程,将实时测得的水样吸光度分解成多种物质的吸光度,利用多元一次方程进行求解并计算出COD的方法。新方法对含邻苯二甲酸氢钾和丙烯酰胺水样测量的COD,误差平均值为+5.0%,对更多组分的水样测量紫外吸光度误差较大,通过引入修正系数修正后误差大幅下降,10次测量的变异系数约0.5%,精密度较好。通过分析新方法实际运用时存在的优劣之处,提出综合高锰酸盐指数(CODMn)来弥补其测量上不足的新型废水监测模式,以实现监测的快速测量、低耗能、低污染和实时性。

Determination of COD in multi-component water by improved spectrophotometry

This paper introduces a new method for determining COD in multicomponent water using improved spectrophotometry.With a variety of material suction light curves regression equations,the real-time measurement of water absorbency are decomposed into various material absorbance.Multiple time equations were used to calculate COD.The COD measured by this new method,which including phthalic acid potassium hydrogen and acrylamide,had the average error for +5.0%.For errors of more complex samples,errors plunged through introducing the error correction coefficient,and coefficient of variation(CV) was about 0.5% and the accuracy was good.The advantages and disadvantages of its actual application and linking permanganate index for its lack of measurement,a new wastewater monitoring mode which had many advantages including more rapid measuring,low energy consumption,low secondary pollution and easy for real-time monitoring,were proposed.