Objective The article studies the determination of CODMn and CODCr 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.
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