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Thallium was determined in 120 samples of soil and 30 samples of stream sediments from the southeastern part of the Silesian-Cracowian zinc−lead ore deposits. Soil samples were taken from topsoils (0.0−0.2 m) and bottom soils (0.8 and 1.0 m). Thallium was determined by flow-injection−differential-pulse anodic stripping voltammetry. The samples were decomposed sequentially with 73% hydrofluoric acid and a mixture of nitric acid and hydrogen peroxide. The results showed that zinc−lead ore mining as well as their processing and smelting leads to a significant increase of thallium in the top layer of soil and in stream sediments. The highest recorded concentration was 150 ppm Tl for stream sediment and 35 ppm for a soil sample. Thallium concentration in small rivers from the investigated area was by 2 orders of magnitude higher than in the reference area. The highest recorded concentration being 3.24 μg L-1.

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In order to demonstrate the applicability of the Flow-Injection Differential-Pulse Anodic Stripping Voltammetry to monitoring of thallium in the environment, thallium concentration in water, bottom sediments and the soil of floodplain terraces of two rivulets were investigated. It is shown, that thallium containing particles are transported by rivulets and are deposited in bottom sediments (7.4 and 1.7 mg g À1 downstream, respectively). Thallium originating from this source is dispersed in flood-plain valley soil and is dissolved in rivulet water. Thallium concentration in water (0.32 and 0.21 mg L À1 downstream , respectively) exceeds the normal level by 20 -30 times.

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