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The distribution gradients of arsenic and chromium in soil around and below nominal 50‐ by 101‐mm (2‐ by 4‐in) southern pine stakes that were treated with either chromated copper arsenate (CCA Type I or Type II) or in ammoniacal copper arsenate (ACA) and exposed nearly 30 years in Poarch fine sandy loam soils in southern Mississippi indicate that the small amounts of As and Cr that move from the stakes into the soil are sorbed by the soil proximal to the stakes. The distribution gradient for copper about the stakes is similar to those for As and Cr, but is less precise. These findings support the hypothesis that CCA‐ and ACA‐treated wood, at least in acidic soils such as the Poarch fine sandy loams, will not contribute significant amounts of As or Cr into surrounding soils and waters.

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Keywords Pentachlorophenol Preservative Cell walls SEM EDXA Longleaf pine (sapwood) Pinus palustris Mill. Schlüsselwörter (Sachgebiete) Schutzmittel Pentachlorphenol Zellwände REM/EDXA Sumpfkiefer (Splintholz) Pinus palustris Mill. SEM X-Ray Microanalysis of Pentachlorophenol in Tracheid Cell Walls of Southern Pine Sap wood SummaryWater-based formulations of pentachlorophenol ('penta') are being considered äs lower-cost replacements for oilborne formulations of that preservative. The location of penta in cell walls may influence durability of treated products. The objective of this study was to determine whether the distribution pattern of waterborne penta in tracheid cell walls was equivalent to that of oilborne penta diluted with mineral spirits. SEM/EDXA was used to determine the distribution patterns in cell walls of southern pine sapwood. Relatively more penta entered and more uniformly penetrated cell walls with water-dispersible penta than with oilborne penta. Rasterelektronenmikroskopische Röntgenstrahlen-Mikroanalyse von Pentachlorphenol in Tracheidenzellwänden des Splintholzes der Sumpfkiefer (Pitchpine) ZusammenfassungRezepturen auf der Basis wässeriger, preisgünstiger Pentachlorphenolschutzmittel anstelle von öllös-lichem Pentachlorphenol wurden untersucht. Die Art der Ablagerung von Pentachlorphenol in den Zellwänden kann die Dauerhaftigkeit der behandelten Hölzer beeinflussen. Aufgabe der Untersuchung war daher zu bestimmen, ob die Art der Verteilung von wässerigem Pentachlorphenol ebenso war wie bei öllöslichem Pentachlorphenol. Die Verteilung wurde mit Hilfe von REM/EDXA bestimmt. Es ergab sich, daß wässeriges (dispergiertes) Pentachlorphenol besser und gleichmäßiger in die Zellwände eindringt als öllösliches Pentachlorphenol.