Similar patterns were found in the other 17 experiments. The relation between the soil pH
and normalized concentration is in focus in thiswork, and the results from all 18 experiments
are summarized in Fig. 3, where data points for the slices (pH, normalized concentration)
are given.In the case of Zn, Fig. 3(B), all data points for soil 4 is above those for soils 2 and 3 at
similar pH values, which means that pH must be lower in soil 4 before Zn is mobilized and
removed compared to the two other soils.