Relative performance of copper/chrome/boron (CCB) and copper/chrome/arsenate (CCA) in ground contact
IRG/WP 92-3694
M E Hedley
The performance of four retentions each of an oxide CCA formulation and a salt formulation of CCB in radiata pine and European beech was compared after 18 years' field exposure. In radiata pine CCA oxide was more effective (4 failures out of 40) than CCB (9 failures out of 40). However, in European beech CCB was substantially more effective (22 failures) than CCA oxide (all failed). Analysis of failed stakes showed that up to 85% of arsenic had been lost from below ground portions of CCA oxide-treated beech stakes compared with 75% of boron from CCB-treated beech stakes. Percentage losses of copper and chromium were less.