310-3 The Effect of Surfactants On Cryptosporidium Parvum Sorption to Soil.

Poster Number 944

See more from this Division: S03 Soil Biology & Biochemistry
See more from this Session: Assessing Soil Microbial and Faunal Communities: II
Wednesday, November 3, 2010
Long Beach Convention Center, Exhibit Hall BC, Lower Level
Share |

David Powelson1, Astrid Jacobson1 and Christophe Darnault2, (1)Utah State University, Logan, UT
(2)University of Illinois at Chicago, Department of Civil & Materials Engineering, Chicago, IL
Soil usually does a good job purifying water from microbial pathogens. Yet even the relatively large protozoan parasite Cryptosporidium parvum (4 µm diameter) has been found in ground water where manure or waste-water has been applied to the surface. Transport of C. parvum oocysts decreases when soil water content decreases, possibly due to accumulation of oocysts at air-water interfaces. Surfactants found in agricultural pesticides and waste-water, as well as natural humic surfactants, decrease the surface tension at the air-water interface and may alter the surface properties of oocysts. As part of a larger study on the effect of surfactants on transport of Cryptosporidium through soil we evaluated the partitioning of oocysts between soil and surfactant solutions in a batch study. We determined the rate of oocyst sorption and desorption from four widespread soils (two from Utah and two from Illinois), in four surfactant solutions (cationic HDTMA, non-ionic Tween 80, anionic Aerosol 22, and natural humic acid). Surfactant concentrations ranged from 0.5 to 2 times the critical micelle concentration. The results of this study will further our understanding of the mechanisms involved in C. parvum retention in porous media.
See more from this Division: S03 Soil Biology & Biochemistry
See more from this Session: Assessing Soil Microbial and Faunal Communities: II