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

Schouten, Peter and Lemckert, Charles and Turnbull, David and Parisi, Alfio and Downs, Nathan and Underhill, Ian and Turner, Geoff (2011) Chemical films and monolayers on the water surface and their interactions with ultraviolet radiation: a pilot investigation. Measurement Science and Technology , 22 (6). pp. 1-15. ISSN 0957-0233

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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.


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Item Type: Article (Commonwealth Reporting Category C)
Refereed: Yes
Item Status: Live Archive
Additional Information: Permanent restricted access to published version due to publisher copyright policy. Article number 065703.
Depositing User: Assoc Prof Alfio Parisi
Faculty / Department / School: Historic - Faculty of Sciences - Department of Biological and Physical Sciences
Date Deposited: 29 Jul 2011 02:20
Last Modified: 03 Jul 2013 00:42
Uncontrolled Keywords: camera; chemical; film; monolayers; ultraviolet; water
Fields of Research (FOR2008): 10 Technology > 1002 Environmental Biotechnology > 100201 Biodiscovery
03 Chemical Sciences > 0301 Analytical Chemistry > 030107 Sensor Technology (Chemical aspects)
09 Engineering > 0905 Civil Engineering > 090509 Water Resources Engineering
Socio-Economic Objective (SEO2008): D Environment > 96 Environment > 9611 Physical and Chemical Conditions of Water > 961199 Physical and Chemical Conditions of Water not elsewhere classified
Identification Number or DOI: doi: 10.1088/0957-0233/22/6/065703
URI: http://eprints.usq.edu.au/id/eprint/19354

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