Relative binding strength for heavy metals in the Brandenburg topsoil

This map is based on the legend units of the soil overview map with corresponding assignment of parameterized surface soil shapes. These represent a soil-forming society per unit of legend. Parameters were applied to the individual (surface) soil forms, including those for calculating the binding strength for heavy metals (see Hennings 2000, Chapter 2), which were determined by field and laboratory tests. For the same horizon-substrate combinations, the corresponding parameters (soil type, humus content, pH value) were statistically derived (usually the median value). The sequence of horizon-substrate combinations in the surface soil forms with their parameters (soil type, humus content, pH value, upper limit of the Go horizon) formed the basis for the calculation of the relative binding strength to heavy metals (see Hennings 2000, linking rule 7.1 to 7.3). The following topic maps show the metal-specific relative binding strength for different depth ranges for the heavy metals Fe(III), Hg, Pb, Cr(III), Cu, Al, Zn, Co, Ni, Cd and Mn. This map shows the relative bond strength for the respective heavy metal in the entire topsoil (including the support horizons up to 3 dm under GOF) for the surface soil shapes involved. For each horizon of the topsoil, the metal-specific pH-dependent binding strength is determined and surcharges are added for corresponding humus and clay contents. The parameters thus determined are weighted, averaged and ordinally scaled in steps 0 to 5 for the horizons involved, with the maximum value limited to 5. With different results for the soil forms of a legend unit, the area-dominant and the subdominant ordinally scaled classified characteristic values were given (see Hennings 2000, VKR 7.1, levels 0 to 5).