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Difficulties in obtaining representative samples for compliance with the Ballast Water Management Convention

Lookup NU author(s): Katharine Carney, Dr Kayvan Pazouki, Dr Sara Marsham, Dr Jane Delany, Professor Ehsan Mesbahi


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As implementation of the Ballast Water Convention draws nearer a major challenge is the development of protocols which accurately assess compliance with the D-2 Standard. Many factors affect the accuracy of assessment: e.g. large volume of ballast water, the shape, size and number of ballast tanks and the heterogeneous distribution of organisms within tanks. These factors hinder efforts to obtain samples that truly represent the total ballast water onboard a vessel. A known cell density of Tetraselmis suecica was added to a storage tank and sampled at discharge. The factors holding period, initial cell density and sampling interval affected representativeness. Most samples underestimated cell density, and some tanks with an initial cell density of 100 cells ml1 showed <10 cells ml1 at discharge, i.e. met the D-2 standard. This highlights difficulties in achieving sample representativeness and when applied to a real ballast tank this will be much harder to achieve.

Publication metadata

Author(s): Carney KJ, Basurko OC, Pazouki K, Marsham S, Delany JE, Desai DV, Anil AC, Mesbahi E

Publication type: Article

Publication status: Published

Journal: Marine Pollution Bulletin

Year: 2013

Volume: 68

Issue: 1-2

Pages: 99-105

Print publication date: 15/03/2013

ISSN (print): 0025-326X

ISSN (electronic): 1879-3363

Publisher: Elsevier Ltd


DOI: 10.1016/j.marpolbul.2012.12.016


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