Grime, Geoff W.

Pearce, R.B.

Watt, Frank

Wong, Andrew H.H

Unimas Institutional Repository

394 Wong el al. : Pixe micro-analysis of preservative treated woodiit' li i i$.) i! iirif tMicro-Analysis of Copper-Chrome-ArsenicPreservative Treated Malavsian Hardwoodsby Nuclear MicroscopybyAndrew H.H. Wongl, Raymond B. Pearce2, Geoff W. Grime3 & Frank Watt3'al) Forest Research lnstitute Malaysia (FRIM), Kepong, 52109 Kuala Lumpur, Malaysia2) School of Biological Sciences, University of Birmingham, Edgbaston,Birmingham BTl5 2TT, United Kingdom3) Scarrning Microprobe Facil ity, Urriversity of Oxford, Keble Road,Oxforc lOXI 3Rl- I ,  Uni ted Kingdorn4) Present address: Nuclear Microscopy Group, Physics Department, NationalUniversity of Singapore, Kent Ridge, Singapore | 19260SUMMARYThe novel nuclear microscopy, essential ly the part icle-incluced X-ray enrission (PtXE) sys-tcrn, was used to study the uracro-distr ibution ancl rnicro-analysis ol 'copper-clrrorne-arsenic(CCA) preservative in Malaysiau hardwoods Kootnpas.sio nralaccetrsis, K. excelsa, Alstoniaspp. and Dipterocarpus spp., and a tenlperate pinervood Pinus sylvestr-is, where the preserva-t ive retention varied between these t imbers. The results revealed that prcservative rnacro-distr i-bu t ion  pa t lc rns  and thc  rc la l i vc  t l r r r r r l i { i cs  o l ' l hc  cons t i {ucn l  c lc rncn ls  co l ) l )c r ,  chrorn iunr  a r rdarsenic depositcd in the parenchyrnatous t issues, l ibres and tracheids ofthese t imbers supportthe general observations in wood using electron-induced X-ray emission (EIXE) linked withelectron microscopy. However, the considerably greater analytical sensitivity of PIXE, amongother advantages of the novel system, would make i t  a potential ly valuable tool for woodpreservation research.Key words; Nuclear microscopy, piXE, CCa preservative, micro-analysis, Malaysian hard-woods.INTRODUCTIONThe electron-induced X-ray enrission (EIXE) inraging ancl attalysis of heavy metal-basedwood preservatives in anatomical sections of ryood has greatly facilltated an understanding ofpreservative distribution in treated wood iu relation to susceptibil i ty to fungal attack, mainlysoft rot (e.g. Greaves & Nilssorr 1982, Daniel & Nilsson 1987). The energy-dispersion X-rayanalysis (EDXA or EDX) in conjunction with electron ir.ricroscopy (SEM or TEM) is a pre-dominant EIXE tool for such applications (e.g. Drysdale et al. l980). However, the iaherentlyhigh background characteristics of EDXA systems on bulk wood sections, affecting the sensi-tivity of 1ow level detection of copper-chrome-arscrric (CCA) preservative in the anatornicalwood structure, makes colnparative CCA preservative micro-distributions between anatomicalfeatures of a wood material inconclusive.While TEM-EDXA, using ultra-thin sections, is prefened to SEM-EDXA in overcoming theabove resolut ion problerns caused by conrpl icat ing c lcct ron l rackscat ter ing (brenrsstrahlungNew Horizons in Wood AnatonryEdited by Y.s. Kim, 2000.Cltonnom Nal'l Uttit,. Pr<',ss, Kv'angjrr)a'ii,

Micro-analysis of copper-chrome-arsenic preservative treated Malaysian hardwoods by nuclear microscopy

http://ir.unimas.my/id/eprint/16087/1/Micro-analysis%20of%20copper-chrome-arsenic%20%28abstract%29.pdf

Micro-analysis of copper-chrome-arsenic preservative treated Malaysian hardwoods by nuclear microscopy

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