Environmental risk assessment of treated wood - A mesocosm study
P Marchal, F Poly
In order to evaluate the environmental impact of treated poles, we have developed physical models (mesocosms) containing around 250 kg of natural soil and a treated pole.
On the top of each mesocosm, a spraying mechanism, which can distribute ultrapure water through several nozzles, was built.
On the lower part of each mesocosm, a small tank, which can contain some litres of leachate, was placed.
During 2 years, the mesocosms were run in order to obtain leachates and soil samples.
The migration of active ingredient from wood to the closed environment was followed with chemical analysis (Cu,Cr, As and B analysis were carried out on soil and leachate samples).
In parallel, ecotoxicological analysis were made on the leachates and on the soil samples; environmental impact on soil was also studied through soil microbial activities with biomarkers analysis.