A Rapid Method for the Detection of Polyethylene Glycols (PEG) in Wood

Abstract

JSTOR is a not-for-profit service that helps scholars, researchers, and students discover, use, and build upon a wide range of content in a trusted digital archive. We use information technology and tools to increase productivity and facilitate new forms of scholarship. For more information about JSTOR, please contact support@jstor.org.Abstract-Polyethylene glycols (PEG) can be detected in wood by their in situ formation of coloured complex compounds. Solutions of potassium bismuth iodide/barium chloride and of bromine/potassium iodide are suitable for spraying directly onto wood, and may even be used on dark-coloured wood by mixing chalk powder into the reagent. By adopting a print-off technique onto damp filter paper, the distribution of PEG in wood can be demonstrated even more exactly, even from very small samples. Print-offs are developed into differentiated coloured pictures with solutions of potassium bismuth iodide/barium chloride, iodine/potassium iodide or ammonium cobalt (II) thiocyanate.

Electron Energy Loss Spectroscopy (EELS) for Quantification of Cell-Wall Penetration of a Melamine Resin

“…Literature on modification and dimensional stabilisation of wood proves ASE to be the most widely used index to determine the extent of modification and degree of cell wall penetration. Microscopy in optical and UV light provides a spatial resolution allowing the lumen penetration to be monitored clearly, but no quantification (Poschmann 1954;Seifert 1957;Plath and Plath 1959;Furuno andGoto 1973, 1975;Koskelainen 1979;Hoffmann 1983;Riens 1988;Wagenführ 1989;Bernard-Maugiron et al 1990;Kamke et al 1996). Electron Energy Loss Spectroscopy (EELS) for Quantification of Cell-Wall Penetration of a Melamine Resin Their quantification of cell wall penetration by ASE is therefore only vague.…”