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Portable Composite Sampler 및 LC-HRMS를 이용한 하폐수처리장 인근 하천수 내 미량오염물질 분석 및 시간경과에 따른 농도 변화
최희련,강대호,최영훈,전준호 한국환경분석학회 2023 환경분석과 독성보건 Vol.26 No.2
With the increase of manufacturing and use of chemicals, an increasing amount of chemicals enters surface water through various pathways. Their concentrations range from ng/L to mg/L, and they are recognized as micropollutants that pose potential risks to human health and aquatic ecosystems. This study quantitatively analyzed the diverse micropollutants in a stream affected by effluents from a waste-water treatment plant (WWTP) and demonstrated the changes in concentration over time. To capture temporal trends, water samples were collected using a portable composite sampler. For a comprehensive chemical analysis of the 148 species, target screening was conducted using liquid chromatography with high resolution mass spectrometer (LC-HRMS). As a result of the quantitative analysis, a total of 71 substances were detected at concentrations higher than the limit of quantification (LOQ). Pharmaceuticals accounted for the highest proportion among the detected substances. Tris (2-butoxyethyl) phosphate (tbep), which is used as an organophosphate flame retardant (OPFRs), was detected as a major pollutant at a maximum of 14,000 ng/L. Metformin, Pentaethylene glycol, cetirizine, ᅠ galaxolidone, acetaminophen, heptaethylene glycol, carbamazepine-10,11-epoxide, sulfapyridine, valsartan acid, telmisartan, fluconazole, benzotriazole, olmesartan, 4-Methyl-1H-benzotriazole, sitagliptin, and perfluorohexanoic acid (PFHxA) were detected at concentrations of 1,000 ng/L or higher. As a unique temporal trend in the concentration, per-and polyfluoroalkyl substances (PFAS) and benzotriazoles exhibited the highest concentrations from 00:30 to 02:00 on 5/10 with a gradual decrease thereafter. The main factor responsible for this change in concentration was the effluent from the WWTP located upstream of the sampling point. In addition, the substance used in a nearby large-scale industrial complex is considered a significant factor.