Division II.6 Pre-treatment of samples, transport and storage

The volume of each collected sample from each individual throughfall, stemflow or open air collector shall be determined. The samples may be analysed separately or pooled with samples collected from the same plot in the same time interval. Throughfall, stemflow or open air samples shall be analysed separately. Samples from stemflow measurements can only be pooled for trees of the same species and similar size and dominance.

Samples from short periods may be analysed as they are, or can be mixed to monthly samples before analysis. If samples are mixed they should be mixed in proportion to the total sample volume.

The samples shall be transported to the laboratory as soon as possible (preferably in cold boxes) and kept in a cold (4 °C) and dark store until analysed.