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back to 6. Results                  6.1. Outdoor experiments                   

6.1.3 Leachate analysis 

After solid phase extraction (SPE) leachate was analyzed GC-ECD.

The cumulative soil leaching (summing up of all leachate analyses) is higher in all non-planted variants of the very low (SA1), low (SA2) and middle (SA3) contaminated soils. 

In the highly polluted AP-soil SA4 no tree-mediated decrease of leaching load was detectable. This effect, however, is explainable with the strong growth inhibition, caused by the additional boron contamination, mentioned above.

There is no influence of tree planting on the  leachate composition. The ratio  ADNT/TNT is not changed by tree planting for all trees tested.

Except from the growth-inhibiting boron-polluted SA4-soil, the time course of leaching shows a clear tendency of decreasing  nitroaromatics (TNT + ADNT) during the progressing dendroremediation for all trees tested.