Publications by authors named "A Perez-Parada"
Microcystins (MCs) are cyclic heptapeptides originating from various cyanobacteria in eutrophic aquatic environments. Their potential consequences on ecosystems and public health underscores the need to explore MCs' occurrence. In this study, liquid chromatography coupled to high-resolution mass spectrometry (LC-HRMS) analysis and a suspect screening workflow supported by open-source tools were employed for the determination of MCs in freshwater and biota samples from a eutrophic dam in Uruguay.
View Article and Find Full Text PDFEnvironmental concentrations of 25 pesticides in superficial water were employed to conduct an ecological risk assessment (ERA) in a mixed land-use basin utilized as a drinking water source. A deterministic risk assessment (RQ) was utilized to evaluate the chronic risk to aquatic biota, while a probabilistic risk assessment (PRA) approach was applied to assess the acute and chronic risk in the most sensitive species and at the community level. A high risk was identified for insecticides (pyrethroids, organophosphates and organochlorines).
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- The study examines the presence and exchange dynamics of organochlorine pesticides (OCPs) and polychlorinated biphenyls (PCBs) in seawater and air at Fildes Bay, Antarctica, during a specific timeframe (Nov 2019 - Jan 2020).
- Hexachlorobenzene (HCB) was found to be the most prevalent compound, while PCB 11 was the most common PCB, with their concentrations being reported in both air and seawater.
- The research indicates that climate change—particularly glacier melting—may be redistributing these pollutants from the frozen environments, potentially transforming Antarctic regions into new sources of these harmful compounds due to altered biogeochemical cycles.
The development of simple, reliable, and cost-effective methods is critically important to study the spatial and temporal variation of microcystins (MCs) in the food chain. Nanobodies (Nbs), antigen binding fragments from camelid antibodies, present valuable features for analytical applications. Their small antigen binding site offers a focused recognition of small analytes, reducing spurious cross-reactivity and matrix effects.
View Article and Find Full Text PDFA pilot annual monitoring survey (April 2018-March 2019) was conducted to investigate the presence of pesticides in superficial water and fish in Laguna del Cisne, one of the most critical drinking water sources in Uruguay. A total of 25 pesticide residues were detected in superficial water (89.3 % of the samples).
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