Many trace organic constituents have been identified in wastewater entering treatment facilities, but source information for many of these, including pesticides, has been difficult to obtain. This study examines 24-h time-weighted composite samples (influent, effluent, and ten sub-sewershed sites) collected monthly from February through December of 2016.   Additional samples were collected from sites with potential for relatively large mass flux of pesticides (i.e., pet grooming operation, pest control operator, and laundromat). All samples were analyzed using both liquid and gas chromatography quadrupole time-of-flight mass spectrometry (LC-QTOF-MS and GC-QTOF-MS) to comprehensively screen for roughly 3500 suspect chemicals. LC-QTOF-MS data were acquired using electrospray ionization (ESI) in positive and negative modes with All-Ions fragmentation, and two accurate mass MS/MS libraries containing &gt;2000 chemicals were screened. The extracts were run on GC-QTOF-MS in electron impact (EI) mode using a retention time locked method and the spectra were screened against a pesticide library containing exact mass fragments and retention times. The results of this study provide a comprehensive view of pesticide, including pesticide adjuvant, and other trace organic compound occurrence at the sub-sewershed scale and offer the opportunity to quantify, within a single sewer catchment, the relative contributions from residential, industrial, commercial, institutional, and municipal sources. <br/>

Broad-scope LC and GC-HRMS screening for organic contaminants in wastewater at the sub-sewershed scale

255th National Meeting (2018)

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