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Environmentally Safe Marine Antifoulant

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by

Farih Satria Rahim

on 14 January 2014

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Transcript of Environmentally Safe Marine Antifoulant

Environmentally Safe Marine Antifoulant
designed by Péter Puklus for Prezi
Main Problem
Antifoulants
Organotin Antifoulants
Environmental Concerns of TBTO
• Half-life of TBTO in seawater is more than 6 months
• High bioconcentration (10 )
• Chronic Toxicity: thickness of oyster shells, sex changes in whelks, imposex in snails, immune system in dolphins
Sea-Nine
Antifoulant
• Created by Rohm and Haas Company
• Active ingredient: 4,5-dichloro-2-n-octyl-4-isothiazolin-3-one (DCOI)
Fouling, the unwanted growth of plants and animals on a ship's surface, costs the shipping industry approximately $3 billion a year, largely due to increased fuel consumption to overcome hydrodynamic drag. Increased fuel consumption contributes to pollution, global warming, and acid rain.
• Used to control the growth of marine
organisms (algae and seaweed-soft foulants;
barnacles and diatoms-hard foulants)
• Usually mixed with the paint as it is applied
to the hull
• Slowly leach form the surface of the hull
4
Properties of
Sea-Nine
• Acutely toxic to a wide range of marine organisms (effective anitfoulant)
• Low bioconcnetration (13)
• Degraded rapidly with a half-life of one day in seawater and one hour in sediment
• No chronic toxicity
Reference
http://www.scranton.edu/faculty/cannm/green-chemistry/english/downloads/environmental.pdf
http://www2.epa.gov/green-chemistry/1996-designing-greener-chemicals-award
http://www.scranton.edu/faculty/cannm/green-chemistry/english/environmentalmodule.shtml
http://toxics.usgs.gov/definitions/bioconcentration.html
http://www.extension.purdue.edu/extmedia/ws/ws-23-w.html
http://www.ncbi.nlm.nih.gov/books/NBK83730/
Full transcript