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@ARTICLE{Laabs:57152,
      author       = {Laabs, V. and Wehrhan, A. and Pinto, A. and Dores, E. and
                      Amelung, W.},
      title        = {{P}esticide fate in tropical wetlands of {B}razil: {A}n
                      aquatic microcosm study under semi-field conditions},
      journal      = {Chemosphere},
      volume       = {67},
      issn         = {0045-6535},
      address      = {Amsterdam [u.a.]},
      publisher    = {Elsevier Science},
      reportid     = {PreJuSER-57152},
      pages        = {975 - 989},
      year         = {2007},
      note         = {Record converted from VDB: 12.11.2012},
      abstract     = {A contamination of off-site aquatic environments with
                      pesticides has been observed in the tropics, yet only sparse
                      information exists about pesticide fate in such ecosystems.
                      The objective of our semi-field study was to elucidate the
                      fate of alachlor, atrazine, chlorpyrifos, endosulfan,
                      metolachlor, profenofos, simazine, and trifluralin in the
                      aqueous environment of the Pantanal wetland (MT, Brazil). To
                      this aim, water and water/sediment microcosms of two sizes
                      (0.78 and 202 l) were installed in the outskirts of this
                      freshwater lagoon environment and pesticide dissipation was
                      monitored for up to 50 d after application. The
                      physical-chemical water conditions that developed in the
                      microcosms were reproducible among field replicates for both
                      system sizes. Pesticide dissipation was substantially
                      enhanced for most pesticides in small microcosms relative to
                      the large ones (reduced DT(50) by a factor of up to 5.3).
                      The presence of sediment in microcosms led to increased
                      persistence of chlorpyrifos, endosulfan, and trifluralin in
                      the test systems, while for polar pesticides (alachlor,
                      atrazine, metolachlor, profenofos, and simazine) a lesser
                      persistence was observed. Atrazine, simazine, metolachlor,
                      and alachlor were identified as the most persistent
                      pesticides in large water microcosms (DT(50) > or = 47 d);
                      in large water/sediment systems endosulfan beta, atrazine,
                      metolachlor, and simazine showed the slowest dissipation
                      (DT(50) > or = 44 d). A medium-term accumulation in the
                      sediment of tropical ecosystems can be expected for
                      chlorpyrifos and endosulfan isomers $(11-35\%$ of applied
                      amount still extractable at 50 d after application). We
                      conclude that the persistence of the studied pesticides in
                      aquatic ecosystems of the tropics is not substantially lower
                      than during summer in temperate regions.},
      keywords     = {Brazil / Geologic Sediments: analysis / Pesticides:
                      analysis / Pesticides: metabolism / Tropical Climate / Water
                      Microbiology / Water Pollutants, Chemical: analysis / Water
                      Pollutants, Chemical: metabolism / Wetlands / Pesticides
                      (NLM Chemicals) / Water Pollutants, Chemical (NLM Chemicals)
                      / J (WoSType)},
      cin          = {ICG-4},
      ddc          = {333.7},
      cid          = {I:(DE-Juel1)VDB793},
      pnm          = {Terrestrische Umwelt},
      pid          = {G:(DE-Juel1)FUEK407},
      shelfmark    = {Environmental Sciences},
      typ          = {PUB:(DE-HGF)16},
      pubmed       = {pmid:17166548},
      UT           = {WOS:000245397100017},
      doi          = {10.1016/j.chemosphere.2006.10.067},
      url          = {https://juser.fz-juelich.de/record/57152},
}