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Evaluating E. coli Transport Risk in Soil using Dye and Bromide Tracers

2012; Wiley; Volume: 76; Issue: 2 Linguagem: Inglês

10.2136/sssaj2011.0250

1435-0661

Fiona Brennan, Gaelene Kramers, Jim Grant, Vincent O’Flaherty, Nicholas M. Holden, Karl G. Richards,

Groundwater flow and contamination studies

Soil Science Society of America JournalVolume 76, Issue 2 p. 663-673 Soil & Water Management & Conservation Evaluating E. coli Transport Risk in Soil using Dye and Bromide Tracers Fiona P. Brennan, Fiona P. Brennan Teagasc, Environmental Research Centre Johnstown Castle Wexford, Ireland and Microbial Ecology Lab. Microbiology, School of Natural Sciences and Ryan Institute National Univ. of Ireland, Galway, IrelandSearch for more papers by this authorGaelene Kramers, Gaelene Kramers Teagasc, Environmental Research Centre Johnstown Castle, Wexford, Ireland UCD Bioresources Research Centre, Biosystems Engineering Univ. College, Dublin, IrelandSearch for more papers by this authorJim Grant, Jim Grant Teagasc, Ashtown Research Centre, Dublin, IrelandSearch for more papers by this authorVincent O'Flaherty, Vincent O'Flaherty Microbial Ecology Lab., Microbiology School of Natural Sciences and Ryan Institute National Univ. of Ireland, Galway, IrelandSearch for more papers by this authorNicholas M. Holden, Nicholas M. Holden UCD Bioresources Research Centre, Biosystems Engineering Univ. College, Dublin, IrelandSearch for more papers by this authorKarl Richards, Corresponding Author Karl Richards Karl.richards@teagasc.ie Teagasc, Environmental Research Centre Johnstown Castle, Wexford, IrelandCorresponding author (Karl.richards@teagasc.ie)Search for more papers by this author Fiona P. Brennan, Fiona P. Brennan Teagasc, Environmental Research Centre Johnstown Castle Wexford, Ireland and Microbial Ecology Lab. Microbiology, School of Natural Sciences and Ryan Institute National Univ. of Ireland, Galway, IrelandSearch for more papers by this authorGaelene Kramers, Gaelene Kramers Teagasc, Environmental Research Centre Johnstown Castle, Wexford, Ireland UCD Bioresources Research Centre, Biosystems Engineering Univ. College, Dublin, IrelandSearch for more papers by this authorJim Grant, Jim Grant Teagasc, Ashtown Research Centre, Dublin, IrelandSearch for more papers by this authorVincent O'Flaherty, Vincent O'Flaherty Microbial Ecology Lab., Microbiology School of Natural Sciences and Ryan Institute National Univ. of Ireland, Galway, IrelandSearch for more papers by this authorNicholas M. Holden, Nicholas M. Holden UCD Bioresources Research Centre, Biosystems Engineering Univ. College, Dublin, IrelandSearch for more papers by this authorKarl Richards, Corresponding Author Karl Richards Karl.richards@teagasc.ie Teagasc, Environmental Research Centre Johnstown Castle, Wexford, IrelandCorresponding author (Karl.richards@teagasc.ie)Search for more papers by this author First published: 01 March 2012 https://doi.org/10.2136/sssaj2011.0250Citations: 9 All rights reserved. No part of this periodical may be reproduced or transmitted in any form or by any means, electronic or mechanical, including photocopying, recording, or any information storage and retrieval system, without permission in writing from the publisher. Permission for printing and for reprinting the material contained herein has been obtained by the publisher. Read the full textAboutPDF ToolsRequest permissionExport citationAdd to favoritesTrack citation ShareShare Give accessShare full text accessShare full-text accessPlease review our Terms and Conditions of Use and check box below to share full-text version of article.I have read and accept the Wiley Online Library Terms and Conditions of UseShareable LinkUse the link below to share a full-text version of this article with your friends and colleagues. Learn more.Copy URL Share a linkShare onFacebookTwitterLinked InRedditWechat Abstract Dye and bromide tracers are established methods of assessing the presence, function, and extent of hydrological pathways in soil. Prediction of E. coli transport pathways in soil, using brilliant blue (BB) dye and bromide tracers, was investigated using in situ field trials on three grassland soil types, under different moisture regimes. Passive transport through preferential flow routes was the dominant mechanism of vertical E. coli transport in the soils studied. However, lateral movement of E. coli from macropores to the soil matrix was also observed. E. coli transport was mainly associated with visualized infiltration patterns but there was some evidence of differential transport of BB and E. coli. Maximum E. coli depth was found not to co-occur with BB and bromide tracers in 44 and 71% of samples, respectively. Soil type and season of application were important in the distribution and maximum depth of E. coli, and the relationship between the bacterium and its tracers. Moisture content was found to be important for the relationship between E. coli and BB, and the extent of this effect varied with soil type. There was a trend of increasing E. coli concentrations to a peak sample moisture concentration of 0.3 to 0.4 g g−1 dry soil followed by a decrease. Overall BB was found to have greater predictive value than Br. Correlation and co-occurrence analysis found that shortly after land application both BB and Br were good predictors of E. coli transport pathways and distribution under certain conditions, but underestimate risk to shallow groundwater. Citing Literature Volume76, Issue2March 2012Pages 663-673 RelatedInformation