ИСТИНА

In old cities of European Russia, thick layers of urbosediments have been accumulated under the impact of anthropogenic activity; these layers are considerably transformed by pedogenetic processes and enriched in technogenic elements. The rate of sulfur accumulation in the organic layer can be judged from data on a relatively young organic layer in Smolensk, in the park of Blonie. Under the recent sediments, a peat-like layer that accumulated in the 18th–19th centuries AD is found. In 200 years, the SO3 content in this layer has reached 5.8%. The upper part of this organic layer has recently been drained. However, the sulfur content in it has significantly decreased.