Biological oxygen demand (BOD5) or chemicaloxygen demand (COD) analysis is widely used toevaluate organic pollutants in water systems as well asthe efficiency of wastewater treatment plants. However,both analysis methods have restrictions such as beinginsensitive, imprecise, time-consuming, and the productionof chemical waste. Therefore, total organic carbon(TOC) analysis for organic pollutants has been consideredfor an alternative analysis instead of BOD5 orCOD. Several studies have investigated the replacementof BOD5 or COD with TOC in wastewater samples;however, few studies have investigated the relationshipsbetween water quality parameters in rivers and lakes.Therefore, this study evaluated the relationships betweenBOD5, COD, or NBOPs and TOC by the analysisof national water quality monitoring data of rivers andlakes for 5 years. High correlation coefficients (r) of0.87 and 0.66 between BOD5 and TOC (p< 0.05) wereobtained for rivers and lakes, respectively, and strongcorrelation coefficients (r) of 0.93 and 0.75 were observedbetween COD and TOC (p<0.05) for rivers andlakes, respectively. The correlation coefficient (r) betweenNBOPs and TOC was 0.93 for rivers and 0.72 forlakes. The coefficients of determination (R2) were 0.75and 0.44 between BOD5 and TOC for rivers and lakes aswell as were 0.87 and 0.57 between COD and TOC forrivers and lakes, respectively. The coefficient of determination(R2) between NBOPs and TOC was 0.73 for
rivers and 0.52 for lakes.
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