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Pyrene and nile red fluorescence probes for in-situ study of polarity and viscosity of soil organic coatings implicated in soil water repellency

Helen Balshaw, Peter Douglas Orcid Logo, Matthew Davies Orcid Logo, Stefan Doerr Orcid Logo

European Journal of Soil Science, Volume: 71, Issue: 5, Pages: 868 - 879

Swansea University Authors: Helen Balshaw, Peter Douglas Orcid Logo, Matthew Davies Orcid Logo, Stefan Doerr Orcid Logo

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DOI (Published version): 10.1111/ejss.12925

Abstract

Soil water repellency, that is, the reduced ability of soils to absorb water, is thought to be caused by organic coatings with predominantly non-polar properties on soil particle surfaces. Given the important role of particle surface polarity in determining soil water repellency, we explored the use...

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Published in: European Journal of Soil Science
ISSN: 1351-0754
Published: Wiley 2020
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URI: https://cronfa.swan.ac.uk/Record/cronfa53042
first_indexed 2019-12-17T19:14:46Z
last_indexed 2020-10-07T03:21:31Z
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spelling 2020-10-06T13:34:35.3707881 v2 53042 2019-12-17 Pyrene and nile red fluorescence probes for in-situ study of polarity and viscosity of soil organic coatings implicated in soil water repellency 6c3a767a810bbcf18dccb4b97445b164 Helen Balshaw Helen Balshaw true false e8784a005f86bc615bc6d04e87fbbacd 0000-0002-7760-3614 Peter Douglas Peter Douglas true false 4ad478e342120ca3434657eb13527636 0000-0003-2595-5121 Matthew Davies Matthew Davies true false 575eb5094f2328249328b3e43deb5088 0000-0002-8700-9002 Stefan Doerr Stefan Doerr true false 2019-12-17 Soil water repellency, that is, the reduced ability of soils to absorb water, is thought to be caused by organic coatings with predominantly non-polar properties on soil particle surfaces. Given the important role of particle surface polarity in determining soil water repellency, we explored the use of fluorescent probes as a method for the direct in-situ determination of the distribution and polarity of organics on bulk soil surfaces, and of their molecular mobility. We used nile red and pyrene, which have both been used successfully as environmental probes in previous studies, but have not been applied before to bulk soils. The probes were either (a) co-deposited with other organics known to induce water-repellent behaviour with acid-washed sand to produce ‘model soils’ or (b) adsorbed directly onto sandy soils that were naturally water repellent to different degrees, and studied using fluorescence microscopy and steady-state and time-resolved fluorescence. Reliable measurements could be made using pyrene as an in-situ probe on both model and natural soils, and a viscosity/mobility probe on model soils, whereas nile red was found not to be a useful probe. On model soils, made using hexadecane (HEX), octadecane (OCT) or stearic acid (SA) on acid-washed sand, pyrene excimer formation kinetics showed a decrease in environment mobility as the organic layer changes from a liquid through to a hard wax. Spectra from pyrene adsorbed to natural soils indicated varying environmental polarity and heterogeneity within the soil samples studied. Journal Article European Journal of Soil Science 71 5 868 879 Wiley 1351-0754 Autofluorescence, water repellent, hydrophobicity, excimer, emission lifetime, emission spectrum 10 9 2020 2020-09-10 10.1111/ejss.12925 COLLEGE NANME COLLEGE CODE Swansea University UKRI, EPSRC, EP/L504865/1 2020-10-06T13:34:35.3707881 2019-12-17T12:58:17.2720484 Faculty of Science and Engineering School of Engineering and Applied Sciences - Uncategorised Helen Balshaw 1 Peter Douglas 0000-0002-7760-3614 2 Matthew Davies 0000-0003-2595-5121 3 Stefan Doerr 0000-0002-8700-9002 4 53042__16278__3d8aaf8996ef4260886e632a75632bea.pdf 53042.VOR.Gold.pdf 2020-01-13T12:52:42.8744711 Output 2476195 application/pdf Version of Record true Released under the terms of a Creative Commons Attribution License (CC-BY). true eng http://creativecommons.org/licenses/by/4.0/
title Pyrene and nile red fluorescence probes for in-situ study of polarity and viscosity of soil organic coatings implicated in soil water repellency
spellingShingle Pyrene and nile red fluorescence probes for in-situ study of polarity and viscosity of soil organic coatings implicated in soil water repellency
Helen Balshaw
Peter Douglas
Matthew Davies
Stefan Doerr
title_short Pyrene and nile red fluorescence probes for in-situ study of polarity and viscosity of soil organic coatings implicated in soil water repellency
title_full Pyrene and nile red fluorescence probes for in-situ study of polarity and viscosity of soil organic coatings implicated in soil water repellency
title_fullStr Pyrene and nile red fluorescence probes for in-situ study of polarity and viscosity of soil organic coatings implicated in soil water repellency
title_full_unstemmed Pyrene and nile red fluorescence probes for in-situ study of polarity and viscosity of soil organic coatings implicated in soil water repellency
title_sort Pyrene and nile red fluorescence probes for in-situ study of polarity and viscosity of soil organic coatings implicated in soil water repellency
author_id_str_mv 6c3a767a810bbcf18dccb4b97445b164
e8784a005f86bc615bc6d04e87fbbacd
4ad478e342120ca3434657eb13527636
575eb5094f2328249328b3e43deb5088
author_id_fullname_str_mv 6c3a767a810bbcf18dccb4b97445b164_***_Helen Balshaw
e8784a005f86bc615bc6d04e87fbbacd_***_Peter Douglas
4ad478e342120ca3434657eb13527636_***_Matthew Davies
575eb5094f2328249328b3e43deb5088_***_Stefan Doerr
author Helen Balshaw
Peter Douglas
Matthew Davies
Stefan Doerr
author2 Helen Balshaw
Peter Douglas
Matthew Davies
Stefan Doerr
format Journal article
container_title European Journal of Soil Science
container_volume 71
container_issue 5
container_start_page 868
publishDate 2020
institution Swansea University
issn 1351-0754
doi_str_mv 10.1111/ejss.12925
publisher Wiley
college_str Faculty of Science and Engineering
hierarchytype
hierarchy_top_id facultyofscienceandengineering
hierarchy_top_title Faculty of Science and Engineering
hierarchy_parent_id facultyofscienceandengineering
hierarchy_parent_title Faculty of Science and Engineering
department_str School of Engineering and Applied Sciences - Uncategorised{{{_:::_}}}Faculty of Science and Engineering{{{_:::_}}}School of Engineering and Applied Sciences - Uncategorised
document_store_str 1
active_str 0
description Soil water repellency, that is, the reduced ability of soils to absorb water, is thought to be caused by organic coatings with predominantly non-polar properties on soil particle surfaces. Given the important role of particle surface polarity in determining soil water repellency, we explored the use of fluorescent probes as a method for the direct in-situ determination of the distribution and polarity of organics on bulk soil surfaces, and of their molecular mobility. We used nile red and pyrene, which have both been used successfully as environmental probes in previous studies, but have not been applied before to bulk soils. The probes were either (a) co-deposited with other organics known to induce water-repellent behaviour with acid-washed sand to produce ‘model soils’ or (b) adsorbed directly onto sandy soils that were naturally water repellent to different degrees, and studied using fluorescence microscopy and steady-state and time-resolved fluorescence. Reliable measurements could be made using pyrene as an in-situ probe on both model and natural soils, and a viscosity/mobility probe on model soils, whereas nile red was found not to be a useful probe. On model soils, made using hexadecane (HEX), octadecane (OCT) or stearic acid (SA) on acid-washed sand, pyrene excimer formation kinetics showed a decrease in environment mobility as the organic layer changes from a liquid through to a hard wax. Spectra from pyrene adsorbed to natural soils indicated varying environmental polarity and heterogeneity within the soil samples studied.
published_date 2020-09-10T13:58:11Z
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score 11.048064

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