Surface Complexation of Carboxylate Adheres Cryptosporidium parvum Oocysts to the Hematite—Water Interface

The interaction of viable Cryptosporidium parvum oocysts at the hematite (alpha-Fe2O3)-water interface was examined over a wide range in solution chemistry using in situ attenuated total reflectance Fourier transform infrared (ATR-FTIR) spectroscopy. Spectra for hematite-sorbed oocysts showed distin...

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Bibliographic Details
Published in:Environmental science & technology 2009-10, Vol.43 (19), p.7423-7429
Main Authors: XIAODONG GAO, METGE, David W, RAY, Chittaranjan, HARVEY, Ronald W, CHOROVER, Jon
Format: Article
Language:English
Subjects:
Animals
Applied sciences
Carboxylic Acids - chemistry
Cell Adhesion - drug effects
Cryptosporidium parvum - physiology
Exact sciences and technology
Ferric Compounds - chemistry
Hydrogen-Ion Concentration
Oocysts - physiology
Pollution
Surface Properties
Water - chemistry
Water - parasitology
Water Purification - methods
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Summary:The interaction of viable Cryptosporidium parvum oocysts at the hematite (alpha-Fe2O3)-water interface was examined over a wide range in solution chemistry using in situ attenuated total reflectance Fourier transform infrared (ATR-FTIR) spectroscopy. Spectra for hematite-sorbed oocysts showed distinct changes in carboxylate group vibrations relative to spectra obtained in the absence of hematite, indicative of direct chemical bonding between carboxylate groups and Fe metal centers of the hematite surface. The data also indicate that complexation modes vary with solution chemistry. InNaCl solution, oocysts are bound to hematite via monodentate and binuclear bidentate complexes. The former predominates at low pH, whereas the latter becomes increasingly prevalent with increasing pH. In a CaCl2 solution, only binuclear bidentate complexes are observed. When solution pH is above the point of zero net proton charge (PZNPC) of hematite, oocyst surface carboxylate groups are bound to the mineral surface via outer-sphere complexes in both electrolyte solutions.
ISSN:0013-936X
1520-5851
DOI:10.1021/es901346z