{"id":6573,"date":"2025-03-07T10:24:03","date_gmt":"2025-03-07T09:24:03","guid":{"rendered":"https:\/\/www.assograie.org\/isrivers\/?p=6573"},"modified":"2025-06-23T10:50:01","modified_gmt":"2025-06-23T08:50:01","slug":"session-a6-contaminant-dynamics","status":"publish","type":"post","link":"https:\/\/www.assograie.org\/isrivers\/en\/2025\/03\/07\/session-a6-contaminant-dynamics\/","title":{"rendered":"Session A6: Contaminant dynamics"},"content":{"rendered":"\n<p class=\"has-text-color has-link-color wp-elements-93c285171eaa25480c8696892987d172\" style=\"color:#ed7102;font-size:30px\"><strong>Thursday 3rd of july &#8211; 08:30<\/strong><\/p>\n\n\n\n<p class=\"has-medium-font-size\"><strong>Session chaired by Olivier Radakovitch and Cecile Miege<\/strong><\/p>\n\n\n<style>.kb-table-of-content-nav.kb-table-of-content-id6573_12e751-43 .kb-table-of-content-wrap{padding-top:var(--global-kb-spacing-sm, 1.5rem);padding-right:var(--global-kb-spacing-sm, 1.5rem);padding-bottom:var(--global-kb-spacing-sm, 1.5rem);padding-left:var(--global-kb-spacing-sm, 1.5rem);}.kb-table-of-content-nav.kb-table-of-content-id6573_12e751-43 .kb-table-of-contents-title-wrap{padding-top:0px;padding-right:0px;padding-bottom:0px;padding-left:0px;}.kb-table-of-content-nav.kb-table-of-content-id6573_12e751-43 .kb-table-of-contents-title{font-weight:regular;font-style:normal;}.kb-table-of-content-nav.kb-table-of-content-id6573_12e751-43 .kb-table-of-content-wrap .kb-table-of-content-list{font-weight:regular;font-style:normal;margin-top:var(--global-kb-spacing-sm, 1.5rem);margin-right:0px;margin-bottom:0px;margin-left:0px;}<\/style>\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<p class=\"has-medium-font-size\"><strong>08:30<\/strong><\/p>\n\n\n\n<h3 class=\"wp-block-heading has-text-color has-link-color wp-elements-b2a7081b0fa2b84aa86daaf55473d3ce\" style=\"color:#ee7203\"><strong><strong>Per- and polyfluoroalkyl substances trends recorded in sedimentary archives upstream and downstream of the Lyon metropolis<\/strong><\/strong><\/h3>\n\n\n\n<p><strong>AUTHORS<\/strong><\/p>\n\n\n\n<h6 class=\"wp-block-heading\">MOURIER Brice, DHIVERT Elie, MARCHAND Philippe<\/h6>\n\n\n\n<p><strong>France<\/strong><\/p>\n\n\n\n<p>Short Abstract: This study focuses on trends in per- and polyfluoroalkyl substances (PFAS) recorded in sediments of the Rh\u00f4ne and Sa\u00f4ne rivers upstream and downstream of the Lyon metropolitan area. To this end, 3 sediment cores taken in 2021 and 2022 were analyzed, thus complementing a sampling strategy initiated in 2012. Contamination levels in the Rh\u00f4ne upstream of Lyon are relatively low compared to other records. However, sedimentary archives of the Sa\u00f4ne river and of the Rh\u00f4ne river downstream Lyon reveal several successive phases of contamination since the 1960s. These phases align, in terms of timing and composition, with the suite of PFAS associated with specific industrial activities in the Sa\u00f4ne basin, particularly south of the Lyon metropolitan area. The signature of these sources has been preserved in the sediments, allowing for the characterization of their spatial and temporal extents. This study contributes to a better understanding of the historical PFAS contamination in the Sa\u00f4ne-Rh\u00f4ne corridor, in a context where the need for knowledge is growing due to health concerns, the increasing media coverage of this pollution, and the numerous emerging mobilizations.<\/p>\n\n\n\n<div class=\"wp-block-buttons is-layout-flex wp-block-buttons-is-layout-flex\">\n<div class=\"wp-block-button\"><a class=\"wp-block-button__link wp-element-button\" href=\"https:\/\/www.assograie.org\/isrivers\/wp-content\/uploads\/2025\/06\/A6-ISR25-219-Mourier-Brice.pdf\" target=\"_blank\" rel=\"noreferrer noopener\">Abstract<\/a><\/div>\n<\/div>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<p style=\"font-size:30px\"><strong>08:50<\/strong><\/p>\n\n\n\n<h3 class=\"wp-block-heading has-text-color has-link-color wp-elements-cc2b29c48df8bef6ac42d6ef8d925f0b\" style=\"color:#ee7203\"><strong><strong>Spatio-temporal dynamics of chemical contamination in the Sa\u00f4ne river and its direct tributaries: an overview of contaminant data from regulatory monitoring data<\/strong><\/strong><\/h3>\n\n\n\n<p><strong>AUTHORS<\/strong><\/p>\n\n\n\n<h6 class=\"wp-block-heading\">CHIFFRE Axelle, DEGIORGI Fran\u00e7ois, CLAVEAU Maeva, MASSON Matthieu, MARGOUM Christelle, AMIOTTE-SUCHET Philippe, DABRIN Aymeric<\/h6>\n\n\n\n<p><strong>France<\/strong><\/p>\n\n\n\n<p>Short Abstract: Data from the Rh\u00f4ne-M\u00e9diterran\u00e9e-Corse Water Agency (AERMC) monitoring networks, along with specific studies along the Sa\u00f4ne classify this watercourse as being in \u00ab\u00a0poor condition\u00a0\u00bb due to widespread contamination. In response, the CONTASAONE project aims to implement an integrative sampling network for water and suspended matter across the Sa\u00f4ne and its main tributaries. The first phase involved reviewing existing data (regulatory monitoring from Na\u00efades) to identify key sites for a sampling network. A total of 1.11 million data points were analyzed, covering 1,529 substances across 37 monitoring stations. The results highlighted gaps in characterizing contamination dynamics, mainly due to the intermittent sampling and the insufficient consideration of the particulate phase. Nevertheless, contamination patterns were dominated by trace metals (TM) and polycyclic aromatic hydrocarbons (PAHs) in the Thalie and Azergues rivers, linked to urban and industrial discharges, while the Ouche, Ognon, and Dheune rivers exhibited higher pesticide levels mostly associated to agricultural activities. This study informed the selection of monitoring sites and highlighted the value of an integrative network for quantitatively assessing contaminant fluxes and identify their sources.<\/p>\n\n\n\n<div class=\"wp-block-buttons is-layout-flex wp-block-buttons-is-layout-flex\">\n<div class=\"wp-block-button\"><a class=\"wp-block-button__link wp-element-button\" href=\"https:\/\/www.assograie.org\/isrivers\/wp-content\/uploads\/2025\/06\/A6-ISR25-186-CHIFFRE-Axelle.pdf\" target=\"_blank\" rel=\"noreferrer noopener\">Abstract<\/a><\/div>\n<\/div>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<p class=\"has-medium-font-size\"><strong>09:10<\/strong><\/p>\n\n\n\n<h3 class=\"wp-block-heading has-text-color has-link-color wp-elements-93dc1bdfa29763f037c92461140058f5\" style=\"color:#ee7203\"><strong><strong>Analysis of historical multi-metallic contamination trends in the sedimentary archives of the Saone (1940s &#8211; present)<\/strong><\/strong><\/h3>\n\n\n\n<p><strong>AUTHORS<\/strong><\/p>\n\n\n\n<h6 class=\"wp-block-heading\">ECORSE Augustine, DHIVERT Elie, DENDIEVEL Andr\u00e9-Marie, COYNEL Alexandra, PEUBLE Steve, PARAN Fr\u00e9d\u00e9ric, WINIARSKI Thierry, MOURIER Brice, BEDELL Jean-Philippe<\/h6>\n\n\n\n<p><strong>France<\/strong><\/p>\n\n\n\n<p>Short Abstract: In order to understand the evolution of metallic contaminant flux in the Saone River towards Lyon over time, two sediment cores were studied. These cores provide records spanning over 80 years with relatively continuous and homogeneous deposition. Age models were established based on radionuclide profiles (137Cs and 210Pb), defining high deposition rates (1\u20132 cm. yr\u207b\u00b9) that enable to study contaminant trends at high temporal resolution. These analyses reveal distinct contamination phases linked to the industrial history of the basin. Based on the chronology covered by these sediment archives, copper, lead, and cadmium contamination can be identified as early as the 1950s, with peaks extending during the 1970s. Later, while contamination levels of these metals, silver reaches maximal concentrations at two periods, in the 1970s and 1980s, and then during the 1990s. Within the industrial context of the basin, silver contamination can be associated with the photographic industry. These findings show that secondary channels of the Saone River have been affected by multi-metallic contamination accumulated since the 1950s. They act as pollution archives, enabling the reconstruction of the consequences of anthropogenic activities on river ecosystems. Moreover, this stock of metallic contaminants requires integrated management within the framework of secondary channel restoration efforts.<\/p>\n\n\n\n<div class=\"wp-block-buttons is-layout-flex wp-block-buttons-is-layout-flex\">\n<div class=\"wp-block-button\"><a class=\"wp-block-button__link wp-element-button\" href=\"https:\/\/www.assograie.org\/isrivers\/wp-content\/uploads\/2025\/06\/A6-ISR25-141-ECORSE-Augustine.pdf\" target=\"_blank\" rel=\"noreferrer noopener\">Abstract<\/a><\/div>\n<\/div>\n\n\n\n<p><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Authors : Brice MOURIER,<br \/>\nAxelle CHIFFRE,<br \/>\nAugustine ECORSE<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"ngg_post_thumbnail":0,"footnotes":""},"categories":[320],"tags":[258],"post_folder":[],"class_list":["post-6573","post","type-post","status-publish","format-standard","hentry","category-session-a6-eng","tag-changing-sociohydrosystems"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v26.8 - 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