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Depending on the physical and chemicalcharacteristics of soil, adsorption of inorganiccomponents of leachates from preservative treatedwood can limit movement of contaminants to othercompartments (soil as a sink) and reduce their toxiceffect by limiting bioavailability. Estimatedadsorption maxima of Cu CCA in organic and clay soilswere the same or higher than for Cu ACQ and Cu CA.The presence of preservative components in the soildecreased the yield and increased their accumulationin ryegrass. Uptake of As, Cu, and Cr in rye grasswas just as well predicted by total soil content aswith any of the bioavailable estimates. ACQ leachateshowed higher toxicity to germination of ryegrassseeds and Daphnia magna toxicity; it had a lowereffect on ryegrass growth than CCA leachate. Reactionof ACQ leachate with sandy soil components resultedin reduced toxicity to Daphnia magna. None of thecontaminated soils had a measurable effect onearthworms, although there was some preservativeuptake in the worms. CCA and ACQ had similar effectson soil microflora/fauna respiration. CA leachate hadlower toxicity to Daphnia magna and similar toxicityto other organisms as ACQ.