Effectiveness of ammoniacal copper zinc arsenate wood preservative as indicated by a soil-block analysis

Standard soil-block tests (ASTM D1413-76) were performed on both leached and nonleached sample blocks treated with an experimental formulation of ammoniacal copper arsenate preservative in which half of the arsenic had been replaced with zinc (ACZA). The test fungi employed were Gloeophyllum trabeum (from Madison #617) and Poria placenta (from Madison #698). The calculated threshold retention values were as follows (lb./ft.3): G. trabeum: 0.165 (nonleached); 0.143 (leached); P. placenta: 0.120 (nonleached); 0.158 (leached). The close correspondence of the calculated threshold values for two different fungi in two separate tests suggests both that the determination of threshold value is accurate, and that the vast majority of the fungitoxic components of the ACZA formulation are tightly bound in the wood and not subject to leaching under the conditions of this test.

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