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Slow diuron release formulations based on clay-phosphatidylcholine complexes
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SYSNO ASEP 0481483 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Slow diuron release formulations based on clay-phosphatidylcholine complexes Author(s) Undabeytia, T. (ES)
Recio, E. (ES)
Maqueda, C. (ES)
Sanchez-Verdejo, T. (ES)
Balek, Vladimír (UACH-T)Source Title Applied Clay Science. - : Elsevier - ISSN 0169-1317
Roč. 55, JAN (2012), s. 53-61Number of pages 9 s. Language eng - English Country NL - Netherlands Keywords Diuron ; Phosphatidylcholine ; Clay mineral ; Leaching ; Bioactivity ; Slow release Subject RIV CA - Inorganic Chemistry OECD category Inorganic and nuclear chemistry R&D Projects LC523 GA MŠMT - Ministry of Education, Youth and Sports (MEYS) Institutional support UACH-T - RVO:61388980 UT WOS 000299984300007 EID SCOPUS 84855420977 DOI 10.1016/j.clay.2011.10.005 Annotation Slow release formulations of the herbicide diuron were designed to reduce the risk of water pollution resulting from conventional formulations. The new formulations were based on herbicide incorporation in phosphatidylcholine (PC) vesicles that were sorbed on the clay mineral montmorillonite. The active ingredient contents of the formulations reached up to 28% w:w. Thermal analysis revealed that the closely packed arrangement of PC on the clay enhanced diuron sorption by disrupting the interactions among PC molecules. Adsorption experiments using diuron were performed in soils with different physico-chemical properties to evaluate the relationship between the sorption and the mobility of the herbicide. In soil column experiments with sandy soil, the herbicide in PC-clay-based formulations mainly accumulated in the top soil, and there was a one-third reduction in leaching compared to the commercial formulation. The differences in leaching (compared to the commercial formulation) were lower when using loam soil due to its higher sorption of the herbicide and hysteresis effects. In the sandy soil, bioassay experiments showed a higher herbicidal activity in the top-soil layer for the PC-clay formulations than for the commercial formulation. Therefore, PC-clay formulations of this herbicide can be used at lower doses than recommended, thereby reducing the environmental risks associated with the application of diuron formulations. Workplace Institute of Inorganic Chemistry Contact Jana Kroneislová, krone@iic.cas.cz, Tel.: 311 236 931 Year of Publishing 2018
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