||Synergistic wood preservatives for replacement of CCA
Nicholas, Darrel D. ;
Schultz, T. P. ;
Kim, M. G.
||Mississippi State Univ., Mississippi State. Forest Products Lab.;National Risk Management Research Lab., Cincinnati, OH. Office of Research and Development.;Department of Agriculture, Washington, DC.
||U.S. Environmental Protection Agency, Office of Research and Development, National Risk Management Research Laboratory,
||EPA/600/R-99/024 ; PB99-153637; EPA-R-821788-01-1
Wood preservatives--Environmental aspects ;
Waste minimization ;
Wood products--Manufacturers--Technological innovations ;
Chromated copper arsenate--Environmental aspects
Wood preservatives ;
Materials replacement ;
Water repellents ;
Environmental chemical substitutes ;
CCA(Chromated Copper Arsenate) ;
Chromated Copper Arsenate ;
Didecyldimethylammonium chloride ;
||Region 10 Library/Seattle,WA
||Most EPA libraries have a fiche copy filed under the call number shown. Check with individual libraries about paper copy.
||xvii, 117 p. : ill. ; 28 cm.
The objective of this project was to evaluate the potential synergistic combinations of environmentally-safe biocides as wood preservatives. Didecyldimethylammonium chloride (DDAC) was combined with either chlorothalonil (CTN), tribromophenol (TBP) or sodium omadine (NaO) to provide the syntergistic mixtures. A total of five systems were examined; one oil-borne (DDAC:CTN) and four water-borne (oil-in-water emulsions) mixtures, including DDAC:NaO with a water repellant. Wood treated with these preservatives was evaluated in both soil contact and above-ground exposure, with CCA and pentachlorophenol (penta) treated wood used as positive controls. The treated wood was evaluated for both biocide efficacy and depletion. The water-borne DDAC:TBP and DDAC:NaO formulations performed poorly in the field tests and, consequently, are not viable wood preservative systems. However, the addition of a water repellent to the DDAC:NaO system greatly improve the performance in above-ground tests, suggesting that this may be a good preservative for this application. The oil-borne DDAC:CTN formulation is performing very well and may be viable wood preservation system. The water-borne DDAC:CTN formulation is performing moderately well at this time but appears to suffer from excessive CTN leaching; this deficiency probably can be corrected with a modified formulation.
"EPA/600/R-99/024." "February 1999." "Project CR 821788-01-1." "Project officer: Paul Randall." "This study was conducted in cooperation with U.S. Department of Agriculture."