Browsing by Autor "Jean Martins"

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Antibiotic Pollution and Occurrence of Bacterial Antibiotic Resistance Genes in Latin American Developing Countries
(2017) Denisse Archundia; Céline Duwig; Jean Martins; Frédéric Lehembre; Marie‐Christine Morel; Gabriela Flores
International audience
Antibiotic pollution in the Katari subcatchment of the Titicaca Lake: Major transformation products and occurrence of resistance genes
(Elsevier BV, 2016) Denisse Archundia; Céline Duwig; Frédéric Lehembre; Serge Chirón; Marie‐Christine Morel; B. Prado; Marjolaine Bourdat-Deschamps; Erwann Vince; Gabriela Patricia Flores Avilés; Jean Martins
Assessment of the Sulfamethoxazole mobility in natural soils and of the risk of contamination of water resources at the catchment scale
(Elsevier BV, 2019) Denisse Archundia; Céline Duwig; Lorenzo Spadini; Marie‐Christine Morel; B. Prado; Mayra Pérez; Vladimir Orsag; Jean Martins
Sulfamethoxazole (SMX) is one of the antibiotics most commonly detected in aquatic and terrestrial environments and is still widely used, especially in low income countries. SMX is assumed to be highly mobile in soils due to its intrinsic molecular properties. Ten soils with contrasting properties and representative of the catchment soil types and land uses were collected throughout the watershed, which undergoes very rapid urban development. SMX displacement experiments were carried out in repacked columns of the 10 soils to explore SMX reactive transfer (mobility and reactivity) in order to assess the contamination risk of water resources in the context of the Bolivian Altiplano. Relevant sorption processes were identified by modelling (HYDRUS-1D) considering different sorption concepts. SMX mobility was best simulated when considering irreversible sorption as well as instantaneous and rate-limited reversible sorption, depending on the soil type. SMX mobility appeared lower in soils located upstream of the watershed (organic and acidic soils - Regosol) in relation with a higher adsorption capacity compared to the soils located downstream (lower organic carbon content - Cambisol). By combining soil column experiments and soil profiles description, this study suggests that SMX can be classified as a moderately to highly mobile compound in the studied watershed, depending principally on soil properties such as pH and OC. Potential risks of surface and groundwater pollution by SMX were thus identified in the lower part of the studied catchment, threatening Lake Titicaca water quality.
Environmental fate and ecotoxicological risk of the antibiotic sulfamethoxazole across the Katari catchment (Bolivian Altiplano): Application of the GREAT-ER model
(Elsevier BV, 2017) Denisse Archundia; Laurie Boithias; Céline Duwig; Marie‐Christine Morel; Gabriela Patricia Flores Avilés; Jean Martins
How Uncontrolled Urban Expansion Increases the Contamination of the Titicaca Lake Basin (El Alto, La Paz, Bolivia)
(Springer Science+Business Media, 2016) Denisse Archundia; Céline Duwig; Lorenzo Spadini; Gaëlle Uzu; Stéphane Guédron; Marie‐Christine Morel; R. Cortez; Oswaldo Ramos Ramos; J. Chincheros; Jean Martins
Impacts of Anthropogenic Activities on the Contamination of a Sub Watershed of Lake Titicaca. Are Antibiotics a Concern in the Bolivian Altiplano?
(Elsevier BV, 2014) Céline Duwig; Denisse Archundia; Frédéric Lehembre; Lorenzo Spadini; Marie‐Christine Morel; Gaëlle Uzu; J. Chincheros; R. Cortez; Jean Martins
The Titicaca Lake is the most important water resource over the Andean plateau and the ecological equilibrium of this region is nowadays perturbed by recent changes in land use and management practices. The Katari watershed encompasses mining area, cities representing over 1.2 million habitants, and agricultural zones before ending in Cohana bay in the Titicaca Lake. Cohana Bay is known to be one of the most eutrophic bay of the Titicaca Lake. The objective of the study was to evaluate the impact of anthropic activities along the watershed on the river quality and on the bacterial diversity. Both mining activities and release of wastewater in river systems impacts greatly the surface water quality, with level of As exceeding limits for drinking water, and phosphate over the European guidelines for bad quality rivers. Antibiotic from the sulfonamide family was detected in the watershed in high concentrations downstream of the two main cities and bacterial resistance occurred in nearly all the sampled water points.
Sulfamethoxazole mobility and risk of contamination of water resources at the catchment scale (Katari - Titicaca Lake, Bolivia)
(2020) Denisse Archundia Peralta; Céline Duwig; Lorenzo Spadini; Marie‐Christine Morel; Blanca Prado; Vladimir Orsac; Jean Martins
&lt;p&gt;Sulfamethoxazole (SMX) is one of the antibiotics most commonly detected in aquatic and terrestrial environments and is still widely used, especially in low income countries. The Katari watershed encompassing the biggest city in the Altiplano and having its outlet in the Titicaca lake was studied: &amp;#160;ten soils having contrasting properties were collected throughout the watershed. SMX displacement experiments were carried out in repacked soil columns to explore SMX reactive transfer and to assess the contamination risk of water resources in the Bolivian Altiplano. Relevant sorption processes were identified by inverse modelling of experimental breakthrough curves. Different processes were identified depending on the soil type: &amp;#160;irreversible sorption, instantaneous and rate-limited reversible sorption. SMX mobility was lower in soils located upstream of the watershed (organic and acidic soils - Regosol) and was related with a higher adsorption capacity compared to the soils located downstream (lower organic carbon content - Cambisol). SMX was be classified as a moderately to highly mobile compound in the studied watershed, linked to soil properties such as pH, OC and soil texture. Sulfamethoxazole can potentially threaten the quality of surface and groundwater pollution in the lower part of the studied catchment, threatening Lake Titicaca water quality.&lt;/p&gt;