Sorption of pesticides by microplastics, charcoal, ash, and river sediments

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dc.contributor.authorFatema, Marufa
dc.contributor.authorFarenhorst, Annemieke
dc.date.accessioned2023-03-27T16:05:30Z
dc.date.available2023-03-27T16:05:30Z
dc.date.issued2022-04-27
dc.date.submitted2023-03-25T02:33:29Zen_US
dc.description.abstractIn addition to sediments, pesticides can be sorbed to other constituents present in rivers including ash, charcoal, and microplastics. Pesticide sorption by microplastics has been studied for hydrophobic compounds such as the legacy insecticide DDT (dichlorodiphenyltrichloroethane) but not for current-use herbicides. The purpose of this study was to investigate to what extent 2,4-dichlorophenoxyacetic acid (2,4-D) (weak acid), atrazine (weak base), and glyphosate (zwitterion) are sorbed by microplastics (i.e., fiber, polyethylene beads, polyvinyl chloride (PVC), and tire fragments) and other river constituents (i.e., ash, charcoal, suspended and bottom sediments). DDT was included in the study to provide reference data that could be compared to known literature values. Batch equilibrium experiments were conducted following Guidelines 106 of the Organisation for Economic Co-operation and Development. Experiments utilized either a 1:100 solid/solution ratio with 0.1 g of a river constituent as the sorbent or a 1:5 solid/solution ratio with the sorbents consisted of 1.9 g bottom sediments mixed with 0.1 g of a river constituent. Background solutions included 0.01 M CaCl 2 or 0.01 M KCl, deionized water, and river water. Individual microplastics always sorbed >50% of DDT. Current-use herbicides had a weak affinity for microplastics (< 6%) except that a substantial amount of glyphosate was sorbed by PVC (32–36%) in 0.01M KCl and DI water. When river water was used as a background solution, rather than 0.01M KCl or deionized water, there was much less glyphosate sorption by PVC, ash, charcoal, and both sediments. This suggested that ions present in river water competed for sorption sites with glyphosate molecules. Across background solutions, sorption by sediments decreased in the order of DDT (91–95%) > glyphosate (36–88%) >atrazine (5–13%) >2,4-D (2–5%). Sorption of 2,4-D, atrazine, and DDT by ash and charcoal was always > 90% but < 35% for glyphosate. Relative to bottom sediments alone, the presence of ash or charcoal (5% by weight) with sediments significantly increased the sorption of 2,4-D, atrazine, and DDT. Microplastic additions (5% by weight) had no impact on all four pesticides’ sorption by sediments. Microplastics are not a strong sorbent for current-use herbicides, although there are exceptions such as glyphosate by PVC. Ions present in river water competed with glyphosate for sorption sites of river constituents. Hence, the types and concentrations of ions present in rivers might have some influence on the partitioning of glyphosate between the water column and solid phase, including glyphosate fate processes in rivers.en_US
dc.description.sponsorshipDiscovery Grant Programen_US
dc.identifier.doi10.1007/s11368-022-03218-8
dc.identifier.urihttp://hdl.handle.net/1993/37220
dc.language.isoengen_US
dc.publisherSpringeren_US
dc.rightsopen accessen_US
dc.subjectJournal of Soils and Sedimentsen_US
dc.subject2,4-dichlorophenoxyacetic aciden_US
dc.subjectAtrazineen_US
dc.subjectGlyphosateen_US
dc.subjectDDTen_US
dc.subjectAshen_US
dc.subjectCharcoalen_US
dc.subjectMicroplasticsen_US
dc.subjectBackground solutionen_US
dc.subjectSedimenten_US
dc.titleSorption of pesticides by microplastics, charcoal, ash, and river sedimentsen_US
dc.typejournal articleen_US
local.author.affiliationFaculty of Agricultural and Food Sciences::Department of Soil Scienceen_US
oaire.awardNumber432009-2013en_US
oaire.awardTitleCollaborative Research and Training Experience Programen_US
oaire.citation.endPage1884en_US
oaire.citation.startPage1876en_US
oaire.citation.titleSorption of pesticides by microplastics, charcoal, ash, and river sedimentsen_US
oaire.citation.volume22en_US
project.funder.identifierNSERC: https://doi.org/10.13039/501100000038en_US
project.funder.nameNatural Sciences and Engineering Research Council of Canadaen_US
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