Figure 4

Umbelliferone dissipation curves in sterilised and nonsterilised soils (a) and effect of the addition of SA-HDTMA and BC at a rate of 4% on the dissipation of umbelliferone in non-sterilised soils B2 (b) and A1 (c). Symbols are experimental data, whereas lines represent the fittings to single first-order dissipation.