Timber Preservation Chemicals Volume 1b - Field Investigations
Report No DWI0447
Oct 1988
SUMMARY
In summary the following observations can be made;
- undercover storage of timbers following treatment results in
lower masses of preservative being leached from the timber;
- for CCA treated timbers, large amounts of preservative salts are
leached on the first day following treatment;
- arsenic followed by copper precipitate out at the fastest rates
in timbers treated with CCA preservative. Chromium becomes insoluble
at a slower rate than arsenic or copper and is therefore leached
more readily from timber over a longer period of time;
- phenols and PAHs are readily leached from wood treated with
creosote (applied by hand) . This is especially so immediately after
treatment and following heavy rainfall;
- heavy rainfall events cause higher masses of water-soluble
preservative chemicals to be leached from timber.
Copies of this report may be available as an Acrobat pdf download under the 'Find Completed Research' heading on the DWI website.