Pfeilsticker K, Markard C
Z Lebensm Unters Forsch. 1975 Jul 18;158(3):129-36. doi: 10.1007/BF01147252.
The contents of Cadmium, lead, and zinc in 136 samples of fruit and vegetable of harvest 1973, taken from gardens in Dortmund, have been analysed by mineralisation, extraction with APDC/MIBK and AAS. 5% of the samples contained more cadmium, 13% more lead and zinc than proposed limits.