Christopher Wu's research while affiliated with University of Washington Tacoma and other places

Publications (9)

Article
Chemical contamination is an increasingly important conservation issue in urban runoff-impacted watersheds. Regulatory and restoration efforts typically evaluate limited conventional parameters and pollutants. However, complex urban chemical mixtures contain hundreds to thousands of organic contaminants that remain unidentified, unregulated, and po...
Article
In U.S. Pacific Northwest coho salmon (Oncorhynchus kisutch), stormwater exposure annually causes unexplained acute mortality when adult salmon migrate to urban creeks to reproduce. By investigating this phenomenon, we identified a highly toxic quinone transformation product of N-(1,3-dimethylbutyl)-N'-phenyl-p-phenylenediamine) (6PPD), a globally...
Article
Stormwater runoff clearly impacts water quality and ecological health of urban receiving waters. Subsequent management efforts are often guided by conceptual models of contaminant “first flushes”, defined by disproportionate concentrations or mass loads early in the storm hydrograph. However, studies examining the dynamics of contaminant transport...
Article
Pollutants transported in urban stormwater runoff induce pervasive water quality degradation in receiving waters. To accurately characterize stormwater quality and treatment system performance across the range of possible contaminant characteristics, comprehensive multi-residue analytical methods are necessary. Here, we developed a solid-phase extr...
Article
High resolution mass spectrometry (HRMS) analyses provide expansive chemical characterizations of environmental samples. To date, most research efforts have developed tools to expedite labor- and time-intensive contaminant identification efforts. However, even without chemical identity, the richness of non-target HRMS datasets represents a signific...
Article
Here, we developed a novel and sensitive method for the detection and quantification of metastable trenbolone and altrenogest photoproducts in agricultural receiving waters based on solid phase extraction (SPE) and liquid chromatography-tandem mass spectrometry (LC-MS/MS). Primary method analytes were seven cycloaddition or photohydration transform...
Article
The hyporheic zone (HZ), located at the interface of surface and groundwater, is a natural bioreactor for attenuation of chemical contaminants. Engineered HZs can be incorporated into stream restoration projects to enhance hyporheic exchange, with flowpaths optimized to promote biological habitat, water quantity, and water quality improvements. Des...
Article
Urban stormwater is a major threat to ecological health, causing a range of adverse, mostly sublethal effects. In western North America, urban runoff is acutely lethal to adult coho salmon (Oncorhynchus kisutch) that spawn each fall in freshwater creeks. Although the mortality syndrome is correlated to urbanization and attributed to road runoff con...

Citations

... Furthermore, in the future accompanying non-target screening approaches may lead to a more comprehensive picture of chemical burdens at different sites, e.g. [58], and may even be used to prioritise and identify unknown pollutants responsible for observed effects [106]. Although a cause-effect relationship could not be established, sediment contamination seems to be a key issue concerning fish health in the Nidda. ...
... Detention-based SCMs are often large and centrally located within a catchment to facilitate complete capture and release of flows from design storm events, making them a good fit for developed areas with larger parcels of available land (Hale 2016). SCMs have since evolved to take up less space and provide improved stormwater quality by treating the first flush of pollution (Peter et al. 2020) using processes including as filtration, sorption, plant uptake, and microbially-mediated breakdown of pollutants. Studies documenting the effectiveness of SCMs vary in scale, from analyzing single SCMs (Kadlec et al. 2020;Mallin et al. 2002;Schwartz et al., 2017) to connected networks of SCMs managing runoff from a catchment (Gagrani et al. 2014;Loperfido et al. 2014;Walsh et al. 2016). ...
... Studies have also shown a reduction in PAH and PAQ concentrations over time after the introduction of light diesel fuels for buses and the exchange of older petrol-driven passenger cars with catalyst-equipped new ones [39,40]. • BTs have found extensive use as additives in vehicle antifreeze and corrosion inhibitors, and have been detected in road runoff-impacted stormwater and receiving waters [24,41,42]. BTs have been detected in road dust and strong correlations were observed between BT concentrations and road density [24,41]. ...
... These methods can be used as screening tools to obtain chemical signatures or 'fingerprints' of individual drinking water samples. These signatures shed light on the sources of the chemicals 27 . To identify the chemicals, scientists use search tools that compare the analytical data with information from online databases [28][29][30] . ...
... While here, we estimated such contributions to be <10%, we note that this is potentially a source of systemic error in analyte quantification in both nontargeted full-scan and targeted MRM analysis because many steroidal (and other compounds) parent-TP pairs are poorly resolved chromatographically especially using fast separation gradients, and they also tend to share common adducts and MS/MS transitions. 46 We anticipate that there exists a subset of overestimated environmental occurrence data in the literature due to contributions from co-eluting TPs with common diagnostic transitions, although such effects are hard to identify a priori. When characterizing TPs, translating mass spectra to tentative structures is typically the most difficult and uncertain task. ...
... The decreased antibiotic concentrations with the aquifer depth suggested an attenuation by porous aquifer materials via adsorption and biodegradation, which agreed with previous studies demonstrating that hyporheic zones are important barriers against contaminants (Peralta-Maraver et al., 2018;Schaper et al., 2018). The negative relationship between log K ow (or pKa) and antibiotic detection concentration (Table S4) suggested that adsorption might be the dominant mechanism of antibiotic removal in hyporheic groundwater, especially for the removal of hydrophobic compounds (Peter et al., 2019). Nevertheless, the complete mineralization of antibiotics depended on biodegradation. ...
... (For interpretation of the references to colour in this figure legend, the reader is referred to the web version of this article.) conducted on other continents (Angeles et al., 2021;Carpenter and Helbling 2018;Emadian et al., 2021;Fabregat-Safont et al., 2021;Peter et al., 2018), whereas several are rarely studied compounds (e.g., benazepril, detomidine, maprotiline, albendazole sulfoxide, albendazole-2-aminosulfone, mebendazole-amine) with potentially high environmental relevance (Belew et al., 2021;Petrovic 2014). Sixty-one additional OMPs (i.e., 39 pharmaceuticals and pharmaceutical TPs, 18 pesticides and pesticide TPs, 2 industrial additives, and 2 household chemicals) have been detected at least once in other regions of SSA but not in Uganda. ...