Lee Jaewoong, Lee Seunghyun, Yu Soonju, Rhew Doughee
Environ Monit Assess. 2016 Apr;188(4):252. doi: 10.1007/s10661-016-5251-1.
Biological oxygen demand (BOD5) or chemical oxygen demand (COD) analysis is widely used to evaluate organic pollutants in water systems as well as the efficiency of wastewater treatment plants. However, both analysis methods have restrictions such as being insensitive, imprecise, time-consuming, and the production of chemical waste. Therefore, total organic carbon (TOC) analysis for organic pollutants has been considered for an alternative analysis instead of BOD5 or COD. Several studies have investigated the replacement of BOD5 or COD with TOC in wastewater samples; however, few studies have investigated the relationships between water quality parameters in rivers and lakes. Therefore, this study evaluated the relationships between BOD5, COD, or NBOPs and TOC by the analysis of national water quality monitoring data of rivers and lakes for 5 years. High correlation coefficients (r) of 0.87 and 0.66 between BOD5 and TOC (p < 0.05) were obtained for rivers and lakes, respectively, and strong correlation coefficients (r) of 0.93 and 0.75 were observed between COD and TOC (p < 0.05) for rivers and lakes, respectively. The correlation coefficient (r) between NBOPs and TOC was 0.93 for rivers and 0.72 for lakes. The coefficients of determination (R 2) were 0.75 and 0.44 between BOD5 and TOC for rivers and lakes as well as were 0.87 and 0.57 between COD and TOC for rivers and lakes, respectively. The coefficient of determination (R 2) between NBOPs and TOC was 0.73 for rivers and 0.52 for lakes.
生物需氧量（BOD5）或化学需氧量（COD）分析被广泛用于评估水系统中的有机污染物以及污水处理厂的效率。然而，这两种分析方法都有局限性，如不灵敏、不精确、耗时以及产生化学废物。因此，总有机碳（TOC）分析被视为替代BOD5或COD的有机污染物分析方法。已有多项研究调查了用TOC替代废水样本中的BOD5或COD；然而，很少有研究调查河流和湖泊水质参数之间的关系。因此，本研究通过分析5年的河流和湖泊国家水质监测数据，评估了BOD5、COD或天然生物源有机物质（NBOPs）与TOC之间的关系。河流和湖泊中BOD5与TOC之间的相关系数（r）分别为0.87和0.66（p < 0.05），河流和湖泊中COD与TOC之间的相关系数（r）分别为0.93和0.75（p < 0.05）。河流中NBOPs与TOC之间的相关系数（r）为0.93，湖泊中为0.72。河流和湖泊中BOD5与TOC之间的决定系数（R²）分别为0.75和0.44，河流和湖泊中COD与TOC之间的决定系数（R²）分别为0.87和0.57。河流中NBOPs与TOC之间的决定系数（R²）为0.73，湖泊中为0.52。
