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. 2018 Jun:200:133-142.
doi: 10.1016/j.chemosphere.2018.02.106. Epub 2018 Feb 19.

Occurrence, distribution, and seasonality of emerging contaminants in urban watersheds

Xuelian Bai  1 , Alex Lutz  2 , Rosemary Carroll  2 , Kristen Keteles  3 , Kenneth Dahlin  4 , Mark Murphy  4 , David Nguyen  4
Affiliations

Occurrence, distribution, and seasonality of emerging contaminants in urban watersheds

Xuelian Bai et al. Chemosphere. 2018 Jun.

Abstract

The widespread occurrence of natural and synthetic organic chemicals in surface waters can cause ecological risks and human health concerns. This study measured a suite of contaminants of emerging concern (CECs) in water samples collected by the U.S. Environmental Protection Agency Region 8 around the Denver, Colorado, metropolitan area. The results showed that 109 of 144 analyzed pharmaceutical compounds, 42 of 55 analyzed waste-indicator compounds (e.g., flame retardants, hormones, and personal care products), and 39 of 72 analyzed pesticides were detected in the water samples collected monthly between April and November in both 2014 and 2015. Pharmaceutical compounds were most abundant in the surface waters and their median concentrations were measured up to a few hundred nanograms per liter. The CEC concentrations varied depending on sampling locations and seasons. The primary source of CECs was speculated to be wastewater effluent. The CEC concentrations were correlated to streamflow volume and showed significant seasonal effects. The CECs were less persistent during spring runoff season compared with baseflow season at most sampling sites. These results are useful for providing baseline data for surface CEC monitoring and assessing the environmental risks and potential human exposure to CECs.

Keywords: Contaminants of emerging concern; Flame retardants; Hormones; Personal care products; Pesticides; Pharmaceuticals.

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Figures

Fig. 1.
Fig. 1.
Map of sampling sites, nearby USGS gauges, and wastewater treatment facilities at the study sites in Denver, Colorado.
Fig. 2.
Fig. 2.
Measured concentrations of top 30 most frequently detected pharmaceutical compounds. Box plots show concentration distribution at the reporting level.
Fig. 3.
Fig. 3.
Map of the number of detection and average concentration of all analytes in the sampled area during both 2014 and 2015.
Fig. 4.
Fig. 4.
Time series of average CEC concentrations in the top four most contaminated sites (BD136, SC94, SP52, and SPCC).
Fig. 5.
Fig. 5.
Map of the seasonal effects on CEC concentrations during the spring runoff (May, June, and July) and baseflow (other months) seasons.
See this image and copyright information in PMC

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