微波消解-分光光度法测定水中COD_(Mn)和COD_(Cr)

Determination of COD_(Mn) and COD_(Cr) in water by microwave digestion-spectrophotometry

目的研究采用微波消解-分光光度法测定水中COD_(Mn)和COD_(Cr)。方法从检出限、精密度、准确度、线性范围、分析速度、测试成本等多种角度探讨该检测方法,并与传统国标方法进行比对。结果实验结果表明,此方法检测结果与国标法的检测结果相近,样品加标回收率高,且检出限更低,相对标准偏差更低。结论该方法操作简便快捷,检测结果准确性好,精密度高,检测范围广,且降低了时间成本和物质成本,减小二次污染,适用于地表水、地下水、污水等不同类型水体的检测。

Objective The article studies the determination of COD_(Mn)and COD_(Cr)in water using microwave digestion spectrophotometry.Methods Explore this detection method from multiple perspectives such as detection limit,precision,accuracy,linear range,analysis speed,and testing cost,and compare it with traditional national standard methods.Results The experimental results show that the detection results of this method are similar to those of the national standard method,with a high recovery rate of sample spiking,a lower detection limit,and a lower relative standard deviation.Conclusion It can be seen that the method is easy and fast to operate,with good detection accuracy,high precision,wide detection range,and reduces time and material costs,reducing secondary pollution.It is suitable for the detection of different types of water bodies such as surface water,groundwater,and sewage.