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Cathodic protection by zinc sacrificial anodes: Impact on marine sediment metallic contamination by C. Rousseau; F. Baraud; L. Leleyter; O. Gil is a Environmental Science article available to read on EtoBox.

What is Cathodic protection by zinc sacrificial anodes: Impact on marine sediment metallic contamination about?

Cathodic protection by sacrificial zinc anodes is often applied to prevent immerged metallic structures from corrosion. But this technique induces the zinc anodes dissolution, which can induce marine sediments and seawater contamination. A large scale experiment, in natural seawater, was conducted during 12 months, in order to evaluate the potential environmental impact of this continuous zinc dissolution, and of some necessary cleaning operations of the anodes surfaces. The heavy metal (Cr, Cu, Pb and Zn) concentration in water and sediment samples was monitored. A sequential extraction procedure was applied on sediment samples to differentiate the zinc mobile fractions from the residual one. A significant increase of zinc concentration was observed in water as well as in the surface sediments under the specific operating conditions. Sediments then become a secondary pollution source, as the sorbed labile zinc can be remobilized to seawater.

Who reads Cathodic protection by zinc sacrificial anodes: Impact on marine sediment metallic contamination?

Author

C. Rousseau; F. Baraud; L. Leleyter; O. Gil

Publisher

Elsevier Science; Elsevier ; Elsevier BV (ISSN 0304-3894)

Published

2009

Language

EN

Field

Environmental Science (Physical Sciences)