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Autor(en) / Beteiligte
Titel
Virus’ (MS2, ϕX174, and Aichi) Attachment on Sand Measured by Atomic Force Microscopy and Their Transport through Sand Columns
Ist Teil von
  • Environmental science & technology, 2010-04, Vol.44 (7), p.2426-2432
Ort / Verlag
Washington, DC: American Chemical Society
Erscheinungsjahr
2010
Link zum Volltext
Quelle
MEDLINE
Beschreibungen/Notizen
  • Atomic force microscopy (AFM) was used to study the attachment of ϕX174, MS2, and Aichi viruses on sands of different surface properties: oxide-removed (clean), goethite-coated, and aluminum oxide-coated. Interaction forces between viruses and sand surfaces were measured by contact mode AFM using tips coated with particles of each virus. Column experiments were conducted to quantify the macroscopic transport and retention of the viruses in sand. The average adhesion force measured with AFM was highest between aluminum oxide-coated sand and all three viruses, followed by goethite-coated sand, and was significantly lower on oxide-removed sand. Among the viruses, adhesion on goethite-coated and aluminum oxide-coated sands followed the order of MS2 > Aichi > ϕX174, and on oxide-removed sand it was ϕX174 > Aichi > MS2. Column breakthrough results revealed the same retention trend, which was completely consistent with AFM force measurements. Strong electrostatic attraction and, to a lesser extent, hydrophobic interactions are responsible for the much greater removal of all three viruses observed in the oxide-coated sands compared to the oxide-removed sand. Mass recovery data indicate that the removal of ϕX174, MS2, and Aichi was largely reversible when eluted with 3% beef extract solution at pH 9.5. The Derjaguin−Landau−Verwey−Overbeek (DLVO) and extended DLVO theories provided correct qualitative predictions on the deposition trend observed in the experiments. This study, to the best of our knowledge, was the first to employ AFM to directly measure interaction forces between viruses and solid surfaces; and it was the first to evaluate the retention and transport behavior of Aichi virus, a human pathogen.

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