Micropollutant screening of road and parking runoff in Paris conurbation
Within the frame of the ROULÉPUR research project, road and parking runoff from four sites (Paris, Compans, Rosny-sous-Bois and Villeneuve-le-Roi) with contrasted trafic levels, all situated in Paris conurbation, have been studied for a very broad spectrum of molecules. A total of 128 micropollutants were monitored, including metallic (n = 41) and organic (n = 87) pollutants. Both dissolved and particulate phases were considered. With the exception of a few molecules which have not been detected, a large majority of the pollutants sought have been detected in runoff, with concentrations ranging from a few ng/l for the least concentrated pollutants such as brominated flame retardants (PBDE, HBCDD, TBBPA) to several tens of µg/l for certain metallic elements. Overall, the contamination profiles are quite similar between the sites; the differences between sites being most often on the levels of concentration. Despite a high inter-event variability on each site, it is observed, for many micropollutants, that the sites with the highest traffic densities (Paris and Compans) have the highest concentrations compared to the other two sites. The Villeneuve-le-Roi site appears for many substances as the least contaminated. Finally, the Rosny-sous-Bois site in most cases has intermediate concentration levels. This trend is clear for metallic elements, total hydrocarbons, PAHs, alkylphenols (APs) and BPA and to lesser extent for PBDE. For perfluoroalkylated compounds, the Rosny-sous-Bois site stands out from other sites with very high point concentrations, but also very different profiles. For a majority of pollutants, similar concentration levels are observed between suspended matter and sediment. More information can be found in the following paper: Gasperi, J.; Le Roux, J.; Deshayes, S.; Ayrault, S.; Bordier, L.; Boudahmane, L.; Budzinski, H.; Caupos, E.; Caubriere, N.; Flanagan, K.; et al. Micropollutants in Urban Runoff from Traffic Areas: Target and Non-Target Screening on Four Contrasted Sites. Water 2022, 14, 394. https://doi.org/10.3390/w14030394
Steps to reproduce
- Set up of field monitoring : flow measurement downstream of a portion of road or parking lot, automatic sampling with refrigerated samplers (1 or 2 samplers per study site) driven by the flowmeter in order to collect flow proportional event mean samples - Sampling : 20 to 34 rain events sampled per study site. Sampling in 20 L glass bottles for organic micropollutants and in 20 L plastic bottles for physical-chemical parameters, trace metals, nutrients and other inorganic compounds. Division of each event mean sample into 1 to 3 subsamples, depending on the volume collected, that will be analysed in different laboratories. - Analysis of both dissolved phase and particulate phase. The studied pollutants can be divided into 5 groups. The number of samples analysed varies between the different groups of pollutants and the sites. Group 1 : 10 trace metals (As, Cd, Cr, Co, Cu, Mo, Ni, Pb, V and Zn) + 11 major elements (Al, Ba, Ca, Fe, Mg, Mn, P, K, Na, Sr and Ti), Group 2 : Sb, Ag, Cs, Rb, Se + 15 Rare Earth Elements Group 3 : 16 US-EPA PAHs + 2 methyl-PAHs + coronene + total hydrocarbons (THC) + 7 alkylphenols (NP, OP, NP1EO, NP2EO, OP1EO, OP2EO, NP1EC) + bisphenol A (BPA) + 15 phthalic acid esters (PAEs) Group 4 : 18 perfluoroalkyl sulfonates (PFASs), 10 polybromo diphenyl ethers (PBDEs), hexa-bromocyclododecane (HBCDD) and tetrabromobisphenol A (TBBPA) Group 5 : 3 organotins, 4 benzotriazoles, 3 oxygenated ethers, chloroalkanes (C10-C13 ), benzophenone and linear alkylbenzene sulfonate (LAS) - Data analysis : Total concentration is calculated as = dissolved concentration + particulate concentration * TSS. Values inferior to LQ were replaced by 0 for the calculation of total concentration. If both dissolved concentration and particulate concentration are inferior to LQ than total concentration inferior to LQ.