Lead and Cadmium in Plants 1991
Contamination of food and feed crops cultivated in West Berlin was systematically investigated by the Heavy Metal Measurement Survey conducted by the Berlin Department of Urban Development and Environmental Protection from 1979-1990 (SenStadtUm 1990). Heavy metal contents of lead, cadmium, zinc, chrome, nickel, vanadium and cobalt were analyzed in 140 kinds of food and feed crops or plant parts. Tests were made of allotment gardens, house yards, horticultural and agricultural areas at 2,377 locations.
Tests were made at agricultural and horticultural areas on crops and plants in cultivation at that time. Tests were made at a majority of allotment garden and house yard sites on standard crops (celery, tomatoes, green kale), which the planters made available in spring. Most sites were tested three times. Various plants or plant sections were tested at each site. The causes of contamination were sought by examining other soil factors, such as other heavy metal contamination, pH value, humus content, clay content and fertility.
Comparable test results for East Berlin are not available.