Schwermetalle und Arsen in Hamburger Kleingaerten - Bodenbelastung und Pflanzenverfuegbarkeit

Soil contamination levels in Hamburg allotments by heavy metals(Cd, Cu, Cr, Ni, Pb, Zn) and arsenic have been analyzed and compared with characteristical soil parameters (pH, organic carbon concentration, clay content). Soil to plant heavy metal transfer rates were determined by container tests, and metal mobility has been evaluated by solvent extraction. Mobility and availability are described as a function of soil properties. In 61% of the investigated 214 locations the concentration of at least one element exceeds the Hamburg standard value. Availability tests revealed for a large part of the locations that the food-standard values for cultivated vegetables may be easily exceeded in the case of cadmium. Soil-threshold values for the Cd uptake are defined as a function of soil properties, and measures are proposed for risk reduction. (WEN)Available from TIB Hannover: RO 3338(23) / FIZ - Fachinformationszzentrum Karlsruhe / TIB - Technische InformationsbibliothekSIGLEDEGerman