The chemistry and kinetic behavior of Cu‐Cr‐As/B wood preservatives. IV. Fixation of CCA to wood

The kinetic behavior of copper–chromium–arsenic (CCA) wood preservatives in their reaction with wood, lignin, cellulose, and their respective simple model compounds, guaiacol and D(+)‐glucose, has been elucidated. Copper chromatesVI/lignin guaiacyl units and chromiumIII arsenates/lignin guaiacyl units, which are stable and insoluble complexes formed during the reaction, have been characterized. No copper arsenates were formed during the reactions (which were carried out using a CCA of type C). The sequence, nature, and combined effect of the reactions of CCA with wood, lignin, and cellulose are similar to that already described for the “CrO3 alone,”1 Cu/Cr2, and Cr/As3 systems. Rate constants, energies of activation, and Arrhenius equations have been obtained and reported. The distribution of CrVI, CrIII, Asv, and Cu2+ in CCA‐C‐treated wood has been calculated. The results obtained have allowed meaningful comparisons of several commercial CCA formulations.