Leaching of Polyurethane Systems for Waterproofing Purposes Whilest Curing
2017
Märkl, Veronika | Pflugmacher, Stephan | Reichert, Anton | Stephan, Dietmar A.
Leaching of polyurethane systems for waterproofing purposes of buildings was investigated in this study. As the curing step is the crucial point for potential impacts on the environment, leaching during this period was assessed by applying three different catalysts, in different amounts as well as two eluents. A modified and intensified version of the European horizontal dynamic surface leaching test was used. Complex assessment of all observed parameters was performed by using chemical as well as ecotoxicological tests. Inorganic and organic parameters were detected in a multi-method approach. The study was supplemented by an aquatic ecotoxicological assay on freshwater algae Desmodesmus subspicatus and a terrestrial assay with Enchytraeus albidus. While sum parameters like pH stayed constant over the test period, up to a maximum of 0.004 mmol/l Zn could be leached from one of the systems used in the intensified tank leaching test. Leaching of organic compounds reached a maximum (612 mmol/l) during the first leaching steps and decreased rapidly to a minimum. Ecotoxicological tests confirm the first leaching steps to be crucial as well as the dosage of the catalyst. Soil tests with E. albidus showed a realistic impact of the eluates on the environment.
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