Chemical films and monolayers on the water surface and their interactions with ultraviolet radiation: a pilot investigation

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Title Chemical films and monolayers on the water surface and their interactions with ultraviolet radiation: a pilot investigation
Author Schouten, Peter William; Lemckert, Charles James; Turnbull, David; Parisi, Alfio; Downs, Nathan; Underhill, Ian David; Turner, Geoff Phillip
Journal Name Measurement Science and Technology
Year Published 2011
Place of publication United Kingdom
Publisher Institute of Physics Publishing
Abstract Over the past 50 years numerous types of chemical films and monolayers have been deployed on top of a wide variety of water reserves in an endeavour to reduce evaporation. To date very little knowledge has been assimilated on how these chemical films and monolayers, once applied to a water surface, influence the underwater UV light field and, in turn, the delicate ecosystems that exist in aquatic environments. This manuscript presents underwater UV exposure profiles weighted to the DNA damage action spectrum measured under an octadecanol/hexadecanol/lime chemical film mixture, a silicone-based chemical film and an octadecanol monolayer applied to the water surface. UV transmission and absorption properties were also evaluated for each of these chemical films and monolayers. From this it was found that when chemical films/monolayers are applied to surface water they can reduce the penetration of biologically effective UV into the water column by up to 85% at a depth as small as 1 cm. This could have a positive influence on the aquatic ecosystem, as harmful UV radiation may be prevented from reaching and consequently damaging a variety of life forms or it could have a negative effect by potentially stopping aquatic organisms from adapting to solar ultraviolet radiation over extended application intervals. Additionally, there is currently no readily applicable system or technique available to readily detect or visualize chemical films and monolayers on the water surface. To overcome this problem a new method of monolayer and chemical film visualization, using a UV camera system, is detailed and tested and its applicability for usage in both laboratory-based trials and real-world operations is evaluated.
Peer Reviewed Yes
Published Yes
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Copyright Statement Copyright 2011 Institute of Physics Publishing. This is the author-manuscript version of this paper. Reproduced in accordance with the copyright policy of the publisher.Please refer to the journal's website for access to the definitive, published version.
Volume 22
Issue Number 6
Page from 1
Page to 15
ISSN 0957-0233
Date Accessioned 2011-08-09
Language en_AU
Faculty Faculty of Science, Environment, Engineering and Technology
Subject Environmental Monitoring
Publication Type Journal Articles (Refereed Article)
Publication Type Code c1

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