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SIMPLIFIED METHODS FOR THE DETERMINATION OF HYDROGEN SULPHIDE ACID IN SEDIMENT CONTAMINATED BY MINING ACTIVITIES

100%
Parvinen P., Wieczorek-Ciurowa K.
Czasopismo Techniczne
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PL
The concentration level of hydrogen sulphide acid in the sediment contaminated by mining activities can be applied as criteria ability of sediments to bind the heavy metals and mobility of such metals. The determination of hydrogen sulphide acid (HSA) by molecular absorption spectrometry and combustion-IR analysis in sediment samples is described. The liberation of H2S is performed through the addition of the concentrated sulphuric or hydrochloric acid. The liberated hydrogen sulphide is measured directly using molecular absorption spectrometry (MAS) and by absorbing the HSA in a silver nitrate solution and measuring the precipitated sulphur by combustion (the IR method). The lowest determinable concentrations were at the level of 2–10 mg g–1.
2
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PROSPECTS OF USING MECHANOCHEMICAL SYNTHESES IN THE FABRICATION OF COMPOSITE POWDERS FOR TRIBOTECHNOLOGY

100%
Sikora T., Wieczorek-Ciurowa K.
Czasopismo Techniczne
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PL
The aim of tribotechnological research is the reduction of tribo-couple wear through the optimization of the functional properties of the materials. Polymer matrix composites enriched by powdered materials (e.g. metal-ceramic composite powders) have a wide range of applications in the field of tribotechnology. The possibilities of producing such fillers via green, environmentally-friendly syntheses using the high-energy ball milling process are presented.
3
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Present and prospective leather industry waste disposal

81%
Fela K., Wieczorek-Ciurowa K., Konopka M., Woźny Z.
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vol. 13
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issue 3
53-55
EN
In this paper general characteristics of the main leather industry waste regarding its amount reduction by thermal treatment have been presented. Both the tannery solid wastes and the sludge contain organic substances. Their energy value is more than 50% higher in comparison to hard coal (nominally 20 MJ/kg as dry material). Up to now, the considerable amounts of energy are not recovered; leather wastes are predominantly on landfill. Implementation of a comprehensive thermal method for tannery solid waste and sludge utilization can permit to solve the waste disposal problem by effective neutralization of all of the waste. Moreover, it should bring economic benefits associated with steam or hot water production and landfill tax avoiding. The study is oriented towards the practical application.
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