In der Juliausgabe des Wissenschaftsjournal \u201eIndustrial Crops and Products\u201c berichten die Autoren Linger et al. \u00fcber die M\u00f6glichkeiten des Schwermetallentzugs aus kontaminierten B\u00f6den durch Hanf. Untersucht wurde die Entzugskapazit\u00e4t und der Einfluss auf die Faserqualit\u00e4t (Feinheit und Festigkeit). Alle Bestandteile der Pflanze enthielten Schwermetallkonzentrationen, wobei der Hauptanteil sich in den Bl\u00e4ttern ansammelte. Die Pflanze lagerte bevorzugt Nickel, gefolgt von Blei und Cadmium, an. Eine Sch\u00e4digung der Fasern durch die Schwermetallbelastung konnte nicht festgestellt werden. <\/p>\n
Abstract:<\/p>\n
Hemp (Cannabis sativa L.) was used to examine its capability as a renewable resource to decontaminate heavy metal polluted soils. The influence of heavy metals on the fibre quality was of special interest. Determination of heavy metal content was carried out by means of atomic absorption spectroscopy (AAS). Four different parts of the plant were examined: seeds, leaves, fibres and hurds. In each case, the concentration relation was Ni>Pb>Cd. However, the heavy metal accumulation in the different parts of the plant was extremely different. All parts of hemp plants contain heavy metals and this is why their use as a commercially utilisable plant material is limited. We found that the highest concentrations of all examined metals were accumulated in the leaves. In this field trial, hemp showed a phytoremediation potential of 126 g Cd (ha vegetation period)-1. We tested the fibre quality by measuring the pure fibre content of the stems and the fibre properties after mechanical separation. In addition, the fibre fineness was examined using airflow systems and image analysis. The strength was measured by testing single fibre bundles with a free clamping distance of 3.2 mm using a universal testing device. Finally, we compared the results from the stems and fibres from trials on heavy metal polluted ground with hemp stems and fibres from non-polluted ground. Since there was no comparable unpolluted area near the polluted one, reference values were taken from an area quite far away and subsequently with a different soil composition and also exposure to different meteorological conditions. Thus, the observed differences are only partially caused by the heavy metal contamination.<\/p>\n