The extraction of boron preservative from treated rubberwood and scots pine samples was compared using methods based on refluxing and extraction in 1N NaOH or distilled water at 80°C. The extract solutions were analysed by Inductively Coupled Plasma spectroscopy (ICP/AES). A simple extraction procedure based on immersion of wood samples of approximate dimension 2 x 1 x 1 cm³ in distilled water at 80°C was found to give boron retention values comparable to values calculated from solution absorption and values from analysis of the internal standard extract (refluxed). The practical advantages of the simple hot distilled water extraction method are outlined.

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