Performance of copper azole treated softwoods exposed to marine borers

Wooden material has been used for shipbuilding and structural purposes in the marine environment since ancient times. Wood being used in the sea water can be damaged by marine wood boring organisms, which can turn marine wooden structures unserviceable with great economic cost. Using naturally durable species and preservative treated wood can increase the service life of wooden maritime structures and avoid or minimise the damages caused by marine borers. In this study, Scots pine (Pinus sylvestris), Black pine (Pinus nigra) and Turkish fir (Abies bornmulleriana) naturally grown and economically important wood species in Turkey were treated with copper-azole and evaluated in marine trials for 7 and 14 months in the Western Black Sea region. In this experiment, Teredo navalis was the only teredinid species identified. Copper-azole treated fir and Scots pine specimens suffered no attack, after 7 and 14 months exposure, except four panels which suffered minor damage. However, copper-azole treated Black pine panels were moderately damaged, and all of the control panels of the softwoods were strongly attacked. The average largest shell diameter was found to be 4,79 mm in Scots pine, while the longest pallets (4,71 mm) was found in Black pine. All untreated test panels scored an average of 4 (heavily attacked) after a 14 month period. The cellulose ratio of Black pine decreased from 56 % to 50 %, and the holo-cellulose ratio from 76 % to 71 %. The treated samples showed resistance against marine borers although the copper (cu) leaching was high during the 14 months exposure underwater.

[1]  D. Gregory,et al.  Selective attack of waterlogged archaeological wood by the shipworm, Teredo navalis and its implications for in-situ preservation , 2015 .

[2]  L. Borges.  Biodegradation of wood exposed in the marine environment: Evaluation of the hazard posed by marine wood-borers in fifteen European sites , 2014 .

[3]  C. Mai,et al.  Marine borers resistance of chemically modified portuguese wood , 2014 .

[4]  M. Humar.  Performance of Native and Copper-Ethanolamine-Treated Wood Exposed to Seawater at Port of Koper , Slovenia , 2014 .

[5]  Miha Humar,et al.  Rezultati izlaganja nezaštićenog drva i drva zaštićenog bakar- etanolaminom utjecaju morske vode u luci Koper, Slovenija , 2013 .

[6]  L. Borges,et al.  Evaluation of wooden materials deteriorated by marine-wood boring organisms in the Black Sea , 2012 .

[7]  T. Yoshimura,et al.  Fungal biodegradation of CCA-treated wood and removal of its metal components. , 2012, Chemosphere.

[8]  G. Velde,et al.  Distribution, settlement, and growth of first-year individuals of the shipworm teredo navalis l. (bivalvia: Teredinidae) in the port of rotterdam area, the netherlands , 2011 .

[9]  M. Yalçın,et al.  Fouling and boring organisms that deteriorate various European and tropical woods at Turkish seas , 2010 .

[10]  I. Graham,et al.  Molecular insight into lignocellulose digestion by a marine isopod in the absence of gut microbes , 2010, Proceedings of the National Academy of Sciences.

[11]  L. Borges,et al.  A laboratory assay for measuring feeding and mortality of the marine wood borer Limnoria under forced feeding conditions: A basis for a standard test method , 2009 .

[12]  L. Borges,et al.  Variation in resistance to marine borers in commercial timbers from Turkey, as assessed by marine trial and laboratory screening , 2009, Turkish Journal of Agriculture and Forestry.

[13]  M. Muslich.  THE CCB TREATMENT OF SIXTEEN INDONESIAN WOOD SPECIES AGAINST MARINE BORERS , 2006 .

[14]  A. Rapp,et al.  Field test of resistance of modified wood to marine borers , 2006 .

[15]  C. Hill,et al.  Wood Modification: Chemical, Thermal and Other Processes , 2006 .

[16]  J. D. Simm,et al.  Manual on the use of Timber in Coastal and River Engineering , 2004 .

[17]  B. Goodell,et al.  Bond durability characterization of preservative treated wood and E-glass/phenolic composite interfaces , 2003 .

[18]  B. Goodell,et al.  The biology of marine wood boring bivalves and their bacterial endosymbionts. , 2003 .

[19]  M. Petrič,et al.  Leaching of copper from wood treated with copper based wood preservatives. , 2001 .

[20]  J. Lester,et al.  Leaching of chromated copper arsenate wood preservatives: a review. , 2001, Environmental pollution.

[21]  V. T. Breslin,et al.  Release of Copper, Chromium and Arsenic from CCA-C Treated Lumber in Estuaries , 1998 .

[22]  R. Rowell,et al.  Paper and Composites from Agro-Based Resources , 1996 .

[23]  E. Pasek,et al.  Sediment toxicity study of CCA-C-treated marine piles , 1996 .

[24]  L. Cookson,et al.  Treated eucalypt and pine sapwood after 25 years in the sea. Part II. Major effect of wood type on the efficiency of some waterborne preservatives , 1995 .

[25]  P. Curran,et al.  Preservative Leaching from Softwoods Submerged in Irish Coastal Waters as Measured by Atomic Absorption Spectrophotometry , 1994 .

[26]  M. Hale,et al.  Wood : decay, pests, and protection , 1993 .

[27]  J S Weis,et al.  Toxicity to estuarine organisms of leachates from chromated copper arsenate treated wood , 1991, Archives of environmental contamination and toxicology.

[28]  L. Cookson,et al.  Treated eucalypt and pine sapwood after 25 years in the sea. Part I. Major effect of wood type on the efficacy of certain creosotes against Limnoria tripunctata Menzies. , 1990 .

[29]  L. Cookson,et al.  The performance in Australia after ten years in the sea of single and double preservative treated timber specimens , 1987 .

[30]  Bruce R. Johnson.  Protection of Timber Bulkheads from Marine Borers , 1987 .

[31]  J. Bultman,et al.  Marine Borer Resistance of Untreated Woods over Long Periods of Immersion in Tropical Waters , 1971 .