Occurrence of azaarenes in sediments of the Danshuei River, Taiwan—The use of azaarenes as indicator of anthropogenic source to the estuarine system

Abstract

Azaarenes belong to the newly identified classes of anthropogenic pollutants. To our knowledge, this study presents the first result of pollution history of azaarenes and their controlling factors in estuary. To understand the transport mechanisms, surface sediment samples were collected from 18 sites of the Danshuei River during the summer and the winter of 2005. The highest concentrations of azaarene, 21.9 ng g 21 for 2-ring, 9.89 ng g 21 for 3-ring, and 9.17 ng g 21 for 4-ring, were observed in midstream surface sediments near the Shi-Zi-Tou waste water pumping station. Therefore, this waste water pumping station not only provides a good sediment accumulation environment but also discharges small particle size sediments, which contain mass amounts of azaarenes into the Danshuei River. This research also finds highly significant covariations among 3-ring and 4-ring azaarenes, which suggests similar source strengths and transport mechanisms for these compounds. Additionally, core samples were collected from two sites of the Danshuei River and analyzed to determine the pollution history. Values found in the core sediments correspond to pollution events in recent history. Contaminant inputs via in situ burning of dumping field and wastewater discharge for the periods of 1975-1985 and 2004-2005

Potential for biodegradation and sorption of acetaminophen, caffeine, propranolol and acebutolol in lab-scale aqueous environments

“…Taiwanese river sediments typically contain a total organic content under 2% [21]. Most sorption characteristics of river sediments correlate with the relative amount of organic matter and the corresponding clay content, and the present study reveals similar sorption tendencies.…”

“…The moisture content was determined to be 21.7 ± 0.6%, with a BET surface area of 6.1 m 2 g −1 . Taiwanese river sediments have been typically shown to have an organic content of <2% [21]. The limited organic content and the available surface area of these sediments would make any organic matter present crucial for the sorption process.…”

The washout effect during laundry on benzothiazole, benzotriazole, quinoline, and their derivatives in clothing textiles

“…Quinoline and its oxidized derivatives were recently quantified in Dutch river sediments and Dutch coastal zone of the North Sea, with the 2-hydroxyquinoline showing the highest concentration (Brulik et al 2013;de Voogt and Laane 2009). Two-ring azaarenes have also been detected in the Danshuei River sediments, in Taiwan (Chen et al 2008). Owing its water solubility and low biodegradability, quinoline is considered as a persistent pollutant in groundwater and soil.…”

Concentrations of polycyclic aromatic hydrocarbon in the surface sediments from inter-tidal areas of Kenting coast, Taiwan

“…The bars indicate standard deviation. ERL indicates effects range low based on the sediment quality guideline, 4,022 ng/g dw (Long et al 1995) and significantly influences the distributions of organic pollutants such as PAHs through either postdepositional adsorption or by co-transport of similarly sourced materials (Gustafsson et al 1997;Naes et al 1998;Jonker and Koelmans 2002;Buckley et al 2004;Hung et al 2007;Chen et al 2008). BC contents of the sediment samples were not estimated in this study; therefore, the correlation between t-PAH concentrations and BC content still needs further research.…”