Issue

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  What are the impacts of this issue?

See maps of historical burdens in Prague

The Biological Pond in Vinor has become notorious, and not just in our country. Although its area was less than two hectares, analyses showed that its bottom sediments contain 9 tons of cadmium, 21 tons of chromium, 15 tons of copper, 73 tons of zinc, 4 tons of nickel, and 1.5 tons of lead. Cadmium concentrations in excess of 2,000 ppm were quite common in the surface layer. (The Gazette of the Ministry of the Environment of the Czech Republic of November 15, 1992 recommends soils containing more than 30 ppm of cadmium for Class C sanitization in the so-called industrial zone. The common natural background value is 0.2 ppm.) This particular site was therefore regarded as one of the most cadmium-contaminated places in the whole world. 

Read about sanitization of Biological Pond, read about inventory of historical burdens