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Post-synthesis surface modification of Cu/Zr metal azolate framework: A pathway to highly sensitive electrochemical biosensors for atrazine detection.
Anal Chim Acta
February 2025
Dept. of Electronic Materials Engineering, Kwangwoon University, Seoul, 01897, Republic of Korea. Electronic address:
Background: Atrazine (ATZ), a pesticide that poses serious health problems, is observed in the environment, thereby prompting its periodic monitoring and control using functional biosensors. However, established methods for ATZ detection have limited applicability. Two-dimensional (2D) metal azolate frameworks (MAF) have a higher surface area per unit volume and provide easier access to active sites.
View Article and Find Full Text PDFPesticides in rainwater: A two-year occurrence study in an unexplored environmental compartment in regions with different land use in the State of São Paulo - Brazil.
Chemosphere
January 2025
Environmental Chemistry Laboratory, Institute of Chemistry, University of Campinas, Campinas, São Paulo, 13083970, Brazil. Electronic address:
Brazil's extensive agricultural area makes it the world's leading soybeans and sugarcane producer. Therefore, the use of large amounts of pesticides directly impacts all environmental compartments, including rainwater. We analyzed 14 pesticides and 5 degradation products in rainwater from three cities in the State of São Paulo, southeastern Brazil, with distinct land uses.
View Article and Find Full Text PDFInsights from multiple stable isotopes (C, N, Cl) into the photodegradation of herbicides atrazine and metolachlor.
Chemosphere
February 2025
Département des sciences de la Terre et de l'atmosphère, Université du Québec à Montréal, Montréal, QC, H2X 1Y4, Canada; Geotop Research Centre, Montréal, QC, H2X 3Y7, Canada. Electronic address:
Many processes can contribute to the attenuation of the frequently detected and toxic herbicides atrazine and metolachlor in surface water, including photodegradation. Multi-element compound-specific isotope analysis has the potential to decipher between these different degradation pathways as Cl is a promising tool for both pathway identification and a sensitive indicator of degradation for both atrazine and metolachlor. In this study, photodegradation experiments of atrazine and metolachlor were conducted under simulated sunlight in buffered solutions (direct photodegradation) and with nitrate (indirect photodegradation by OH radicals) to determine kinetics, transformation products and isotope fractionation for C, N and for the first time Cl.
View Article and Find Full Text PDFPesticide contamination and associated ecological risks in estuarine waters of Brazil's Legal Amazon.
Environ Sci Pollut Res Int
January 2025
Laboratório de Química Analítica E Ecotoxicologia (LAEC), Federal University of Maranhão (UFMA), Av. Dos Portugueses, 1966, São Luís, Maranhão, 65080-805, Brazil.
Pesticide contamination remains a significant environmental concern globally, with important implications for aquatic ecosystems. Despite being one of the world's largest pesticide consumers, monitoring and assessment of pesticide pollution are limited in Brazil, especially in sensitive regions like the Amazon. In this study, the occurrence and environmental risks of 8 pesticides of different classes, namely alachlor, atrazine, chlorfenvinphos, isoproturon, irgarol, simazine, diuron, and its transformation product DCPMU (1-(3,4-dichlorophenyl)-3-methyl urea) were analysed in surface water of the São Marcos Estuarine Complex (SMEC) in two consecutive years.
View Article and Find Full Text PDFA new conjugated mesoporous polymer as fluorescence sensor for the detection of nerve agent simulant dimethyl chlorophosphonate via specific nucleophilic substitution reaction.
Talanta
December 2024
College of Chemistry, Jilin University, Changchun, 130012, PR China. Electronic address:
Article Synopsis
- Conjugated micro/mesoporous polymers (CMPs) are porous organic materials created through covalent bonds, with DAC-TFP CMP being a synthesized example made from specific building blocks.
- DAC-TFP CMP exhibits great thermal and chemical stability and shows a selective "on-off" fluorescence response to the nerve agent simulant DMCP, allowing for low-level detection.
- The interaction between DMCP and DAC-TFP CMP leads to a nucleophilic substitution and a fluorescence quenching effect due to intramolecular charge transfer, indicating DAC-TFP CMP's strong capability as a chemosensor for environmental applications.
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