Posted: 26/07/2013 at 21:45
I'm not an expert, but googled Tanalith 'E'. There's alot on information on line. This is what I found-
... it's a waterborne product based on copper triazole technology. Copper is derived from recycled sources and triazoles are organic biodegradable biocides, commonly used to protect many of the food crops we eat. TANALISED pressure treated timber is usually specified for both in and out of ground contact applications where there is a medium to high risk of decay or insect attack.
sounds ok to use on raised beds. A further google search said if the wood has been treated prior to being used as a raised bed and not treated afterwards as a preserve it is ok to grow veg oganically.
It can be difficult when making raised beds from wood to decide what to use to preserve the wood if you grow veg in the beds. Mine are wooden and I didn't pay to much attention to preserving them, two were bought online fit for purpose and a third was constructed from scafolding boards.
I'm sure other posters will be able to give further advise but as you've made the beds and if concerned about stuff leaching into the soil you could further line the wood on the insde of the raised bed with plastic.