낙동강 중하류에서의 미량오염물질 출현 및 농도
Occurrence and Concentration of Micropollutants in the Middle-and Down-stream of Nakdong River
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The Nakdong River runs through highly industrialized and populated areas and has thus been polluted with numerousanthropogenic chemicals. As a growing number of new chemicals have been developed and used, the complexityof pollution in the receiving water has increased. In this study, LC-HRMS-based quantitative analysis was performedon 174 micropollutants in order to understand the status of new trace pollutants occurring in the middle and lowersections of the Nakdong River. In this analysis, 106 substances were detected at concentrations above the LOQ. Benzotriazole,used as a rust inhibitor, showed the highest median concentration, followed by metformin and diethyleneglycol dibenzoate, all with maximum concentrations above 1,000 ng/L. Among pharmaceuticals, metformin, valsartanicacid, metoprolol acid, and carbamazepine had high median concentrations. Similarly, high concentrationswere observed for metolachlor ESA, 2-aminobenzimidazole, and flubendiamide among pesticides, and benzotriazole,diethylene glycol dibenzoate, and dimethyl phthalate among industrial agents and other substances. The samplecollection point with the highest number of substances detected was point N3, which also showed the greatestsum of median concentrations. With respect to substance groups, the highest median concentration levels were foundat N2 for pharmaceuticals, N1 for pesticides, and N3 for industrial chemicals. Among the detected trace pollutants,a total of 44 substances were selected as priority substances after considering domestic and international water qualitystandards, detection concentration and frequency, and toxicity. These substances are suggested for preferential monitoringand management in the middle and lower sections of the Nakdong River.
Abstract
The Nakdong River runs through highly industrialized and populated areas and has thus been polluted with numerousanthropogenic chemicals. As a growing number of new chemicals have been developed and used, the complexityof pollution in the receiving water has increased. In this study, LC-HRMS-based quantitative analysis was performedon 174 micropollutants in order to understand the status of new trace pollutants occurring in the middle and lowersections of the Nakdong River. In this analysis, 106 substances were detected at concentrations above the LOQ. Benzotriazole,used as a rust inhibitor, showed the highest median concentration, followed by metformin and diethyleneglycol dibenzoate, all with maximum concentrations above 1,000 ng/L. Among pharmaceuticals, metformin, valsartanicacid, metoprolol acid, and carbamazepine had high median concentrations. Similarly, high concentrationswere observed for metolachlor ESA, 2-aminobenzimidazole, and flubendiamide among pesticides, and benzotriazole,diethylene glycol dibenzoate, and dimethyl phthalate among industrial agents and other substances. The samplecollection point with the highest number of substances detected was point N3, which also showed the greatestsum of median concentrations. With respect to substance groups, the highest median concentration levels were foundat N2 for pharmaceuticals, N1 for pesticides, and N3 for industrial chemicals. Among the detected trace pollutants,a total of 44 substances were selected as priority substances after considering domestic and international water qualitystandards, detection concentration and frequency, and toxicity. These substances are suggested for preferential monitoringand management in the middle and lower sections of the Nakdong River.
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