Abstract
Abstract Soluble and total lead were determined in soils sampled in 1974 and 1987 using acid ammonium acetate-EDTA and aqua regia for extraction, respectively. The concentration of total lead decreased during the 13 Years period from 7.9 to 7.6 mg/l soil corresponding to total amount of 15.8 and 15.2 kg/ha in the plough layer. The concentration of soluble lead decreased more than total lead and amounted to 8% compared to 4% in case of total lead. This favourable development is caused by introduction of unleaded petrol and hence decreased lead emissions from traffic. Speciation studies would be a useful tool to elucidate the pathways of lead deposited on soil.
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