Docosahexaenoic acid (DHA) is an essential, omega-3, long-chain polyunsaturated fatty that a key component of cell membranes and plays vital role in vertebrate brain function. The capacity to synthesize DHA limited mammals, despite its critical neurological development health. For humans, most commonly obtained by eating fish. Global warming predicted reduce the de novo synthesis algae, at base aquatic food chains, which expected transferred We estimated global quantity (total per capita)...

Organophosphate esters (OPEs), used as flame retardants and plasticizers, occur at relatively high concentrations in urban air surface waters. We tested the hypothesis that some OPEs could be considered persistent mobile organic compounds (PMOCs), using poly parameter linear free energy relationship-modified Multimedia Urban Model (ppLFER-MUM) Toronto, Canada, a case study. Modeled emissions of ∑6OPEs 3300 (190–190 000) kg yr–1 were 10–100 times higher than polychlorinated biphenyls (∑5PCBs)...

Organophosphate esters (OPEs) in air have been found to be captured entirely on filters of typical active samplers and thus designated as being the particle phase. However, this fraction is unexpected, especially for more volatile tris(2-chloroethyl) phosphate (TCEP) tris(chloroisopropyl) (TCIPP). We evaluated gas-particle partitioning indoor outdoor OPEs polybrominated diphenyl ethers (PBDEs) using single-parameter models (Junge-Pankow, Harner-Bidleman) poly-parameter linear free energy...

Cities are drivers of the global economy, containing products and industries that emit many chemicals. Here, we use Multimedia Urban Model (MUM) to estimate atmospheric emissions fate organophosphate esters (OPEs) from 19 mega or major cities, finding they collectively emitted ~81,000 kg yr-1 ∑10OPEs in 2018. Typically, polar "mobile" compounds tend partition be advected by water, while non-polar "bioaccumulative" chemicals do not. Depending on built environment climate city considered, same...

Road runoff to streams and rivers exposes aquatic organisms complex mixtures of chemical contaminants. In particular, the tire-derived 6PPD-quinone (N-(1,3-dimethylbutyl)-N′-phenyl-p-phenylenediamine-quinone) is acutely toxic several species salmonids, which are critical fisheries, ecosystems, Indigenous cultures. We therefore urgently require interventions that can reduce loadings salmonid habitats. Herein, we conducted a spike recovery experiment on full-scale, mature bioretention cell...

Stormwater rapidly moves trace organic contaminants (TrOCs) from the built environment to aquatic environment. Bioretention cells reduce loadings of some TrOCs, but they struggle with hydrophilic compounds. Herein, we assessed potential enhance TrOC removal via changes in bioretention system design by simulating fate seven high-priority stormwater TrOCs (e.g., PFOA, 6PPD-quinone, PAHs) log KOC values between −1.5 and 6.74 a cell. We evaluated eight management interventions for three...

Bioretention cells can effectively infiltrate stormwater runoff and partly remove conventional water contaminants. A field tracer injection experiment in a conventionally designed bioretention cell was used to investigate the fate of benzotriazole, model trace organic contaminant, during between events. Moderate (29%) benzotriazole load reductions were measured 6 h long experiment. The detection 1-methyl hydroxy methoxy provided situ evidence some rapid microbial transformation test more...

The subcooled liquid-phase vapor pressures (pL298/Pa) and octanol–air partition coefficients (KOA298) at T/K = 298, enthalpies of vaporization (ΔVAPH/kJ·mol–1), internal energies phase transfer from octanol to air (ΔOAU/kJ·mol–1) were estimated for synthetic musks, novel brominated flame retardants (N-BFR), organophosphate esters, ultraviolet filters using the capillary gas chromatographic retention time (GC-RT) method. These compounds, which spanned approximately six three orders magnitude...

Accurate values of physicochemical properties are essential for screening semivolatile organic compounds human and environmental hazard risk. In silico approaches estimation widely used, but the accuracy these measured can be difficult to ascertain. Final adjusted (FAVs) harmonize literature-reported measurements ensure consistency minimize uncertainty. We propose a workflow, including novel Bayesian approach, estimating FAVs that combines using direct indirect methods in values. The...

Bioretention cells are a stormwater management technology intended to reduce the quantity of water entering receiving bodies. They also used contaminant releases, but their performance is unclear for hydrophilic persistent and mobile organic compounds (PMOCs). We developed novel eight-compartment one-dimensional (1D) multimedia model bioretention cell ("Bioretention Blues") applied it spike recovery experiment conducted on system near Toronto, Canada, involving PMOC benzotriazole four...

Scientists and decision makers need accurate, accessible fast tools to assess prioritize the persistence (POV) environmental long-range transport potential (LRTP) of chemicals. Here we evaluated Organisation for Economic Co-operation Development (OECD) POV LRTP Screening Tool ("the Tool") with respect estimates that provides organophosphate esters (OPEs). We found use default parameter values could significantly underestimate OPEs and, potentially, other Persistent Mobile Organic Compounds...

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Indoor environments have elevated concentrations of numerous semivolatile organic compounds (SVOCs). Textiles provide a large surface area for accumulating SVOCs, which can be transported to outdoors through washing. A multimedia model was developed estimate advective transport rates (fluxes) 14 SVOCs from indoors by textile washing, ventilation, and dust removal/disposal. Most predicted were within 1 order magnitude measurements study 26 Canadian homes. Median fluxes [μg·(year·home)−1]...

Abstract Cities are drivers of the global economy, containing products and industries that emit many chemicals. We used Multimedia Urban Model (MUM) to estimate atmospheric emissions fate organophosphate esters (OPEs) from 19 “mega or major cities,” finding they collectively emitted ~ 81,000 kg yr − 1 ∑ 10 OPEs in 2018. Typically, polar "mobile" compounds tend partition be advected by water, while non-polar "bioaccumulative" chemicals do not. Depending on built environment climate city...