Marine borer resistance of some tropical and domestic wood species in Turkish waters, and leaching properties of extractives and wood preservative chemicals

In this study, natural durability against fouling and boring organisms (teredinidae ve pholadidae) of some tropical and domestic tree species were investigated in Turkish seas and the amount of leaching extractives and chemical preservatives was determined.Tropical (Afrormosia, Akajou, Azobe, Bilinga, Bubinga, Douka, Dousse, Iroko, Limba, Movingu, Okume, Ovengkol, Paduk, Sapelli, Wenge) and domestic wood species (Juniper, Walnut, Mulberry, Elm, Blackpine, Chestnut, Oak, Cedar, Cypress, Acacia) were examined in this study. All specimens were prepared from the heartwood section of woods and were positioned in 6 ports in Turkish seas (Black sea, Marmora sea, Aegean sea and Mediterranean sea). The exposure time of specimens was 12 months. Natural durability of these samples were determined taking into account the sea temperature, salinity, and climate conditions. The effects of impregnation was also studied using Pinus sylvestris wood samples. These wood samples were impregnated with CCA, CCB, creosote and Tanalith ?E.The results on natural durability showed that domestic wood species are heavily destroyed compared to the tropical species and only exception was observed with the Olive wood. The most durable wood tropical wood species was Wenge.When the port were compared, the samples in İskenderun port was highly damaged. On the other hand, the least damage was observed in Alaçatı port. Regarding the fouling and boring organisms, fouling (28%) and boring (42%) organisms mostly observed in Iskendurun port. Teredo navalis ve Lyrodus pedicellatus was observed in all ports.The amount of extractives leaching differed depending on the ports and group of wood species. İn addition, it was varied for wood species. The most leaching was in Trabzon and Iskenderun. On the other hand, the least leaching was in Alacati and Finike.Examinations in CCA and CCB impregnated samples showed high amount of leaching of Cu and Cr. When CCA impregnated samples were compared, higher Cr leaching was observed compared to the Cu. Regarding the impregnated samples, the least leaching was observed in Bandirma port.Keywords: Domestic tree species, tropical tree species, boring organisms, CCA, CCB, natural durability, heartwood, extractive materials