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The paper presents results of aluminium concentration determination in the samples of surface water and bottom sediments of the Mała Wełna River (West Poland). In the surface water the concentration of aluminium varies in the range from 4.14 to 25.9 μg/dm^3. With use of the Mineql+ program the concentration of the aluminium sulphate complexes in the water samples studied has been determined in a model...
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