The present study utilizes an intelligent integrated COD digestion instrument to assess the feasibility of measuring COD in high-chloride wastewater.This assessment is based on the detection limit,lower limit of quantification,precision,and accuracy of the measurement method.The experimental results indicate that the detection limit is less than 10 mg/L,with a relative standard deviation for precision ranging from 1.3％to 6.7％,and a relative error for accuracy between-4.1％and 2.5％.Both precision and accuracy demonstrate relatively high levels.The measurements obtained using the intelligent integrated COD digestion instrument meet the standards set forth in HJ/T70-2001 regarding precision and accuracy for determining COD in high-chloride wastewater.Furthermore,this instrument offers ease of operation.
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