Treatability and distribution of CCA preservative in Shorea leprosula

Ani S., . and Salamah S., . (2003) Treatability and distribution of CCA preservative in Shorea leprosula. [Proceedings Paper]

Treatment of Shorea leprosula family Dipterocarpaceae with CCA containing copper chromium and arsenic salts a water-based preservative is difficult even by using a full cell process. Its chemical absorption range is only 80 to 160 Iitres m compared to that of kempas Koompassia mulaccensis which is much higher at 240 to 320 Iitres m. This difference indicates that S. leprosula is not as amenable to preservative treatment as kempas a nondipterocarp species. Further analysis of the preservative distribution in the wood was carried out using scanning electron microscope SEM and energy dispersive X-ray analysis EDXA. It was found that after the treatment process the preservative ratio of chromium Cr was the highest in the parenchyma while copper Cu and arsenic As were highly distributed in the vessels. It appears that parenchyma is more amenable to the fixing agent Cr and vessels to the absorption of Cu and As. The absorption of Cu is important in timber preservation as it has a fungicidal effect while the As component has both insecticidal and termiticidal effects. Both Cu and As are fixed in the wood during treatment by the Cr component which renders them insoluble. The same trend of chemical component absorption in the wood tissues was also observed for kempas. Thus Cr appears to be found more in the parenchyma than in other tissues while Cu and As appear to be detected more in the vessels of both S. leprosula and K. malaccensis. The trend seems to indicate a certain selectivity of the particular tissue towards the different elements in the preservative.

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Abstract

Treatment of Shorea leprosula family Dipterocarpaceae with CCA containing copper chromium and arsenic salts a water-based preservative is difficult even by using a full cell process. Its chemical absorption range is only 80 to 160 Iitres m compared to that of kempas Koompassia mulaccensis which is much higher at 240 to 320 Iitres m. This difference indicates that S. leprosula is not as amenable to preservative treatment as kempas a nondipterocarp species. Further analysis of the preservative distribution in the wood was carried out using scanning electron microscope SEM and energy dispersive X-ray analysis EDXA. It was found that after the treatment process the preservative ratio of chromium Cr was the highest in the parenchyma while copper Cu and arsenic As were highly distributed in the vessels. It appears that parenchyma is more amenable to the fixing agent Cr and vessels to the absorption of Cu and As. The absorption of Cu is important in timber preservation as it has a fungicidal effect while the As component has both insecticidal and termiticidal effects. Both Cu and As are fixed in the wood during treatment by the Cr component which renders them insoluble. The same trend of chemical component absorption in the wood tissues was also observed for kempas. Thus Cr appears to be found more in the parenchyma than in other tissues while Cu and As appear to be detected more in the vessels of both S. leprosula and K. malaccensis. The trend seems to indicate a certain selectivity of the particular tissue towards the different elements in the preservative.

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Item Type:	Proceedings Paper
Additional Information:	Available at Perpustakaan Sultan Abdul Samad Universiti Putra Malaysia 43400 UPM Serdang Selangor Malaysia. QK495 D564R859 2002 Call Number.
AGROVOC Term:	Dipterocarpaceae
AGROVOC Term:	Dipterocarps
AGROVOC Term:	Shorea
AGROVOC Term:	Tissue analysis
AGROVOC Term:	Microscopy
AGROVOC Term:	Preservatives
AGROVOC Term:	Copper
AGROVOC Term:	Chromium
AGROVOC Term:	Arsenic
AGROVOC Term:	Parenchyma
Geographical Term:	MALAYSIA
Depositing User:	Ms. Suzila Mohamad Kasim
Last Modified:	24 Apr 2025 05:16
URI:	http://webagris.upm.edu.my/id/eprint/13489

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