Details zur Publikation

Referenztyp Zeitschriften
DOI / URL Link
Titel (primär) Physiological responses of Juncus effusus (rush) to chromium and relevance for wastewater treatment in constructed wetlands
Autor Gruber, H.; Wießner, A.; Kuschk, P.; Kästner, M.; Appenroth, K.-J.;
Journal / Serie International Journal of Phytoremediation
Erscheinungsjahr 2008
Department UBT;
Band/Volume 10
Heft 2
Sprache englisch;
Keywords chlorophyll fluorescence; constructed wetland; dichromate stress; growth parameters; Juncus effusus
Abstract Constructed wetlands are increasingly applied for industrial wastewater treatment. However, current knowledge of the stress responses of helophytes to selected toxicants such as dichromate is limited. The goal of the experiments presented here was to characterize the physiological response of Juncus effusus to different concentrations of dichromate dependent upon the growth and constitution of the plants. The growth parameters, shoot length, and dry weight already were strongly affected at low dichromate concentrations of approximately 34 M. Concentrations of 340 M impaired chlorophyll fluorescence and a decrease in chlorophyll a started at concentrations higher than 170 M dichromate. The concentrations of chlorophyll b and carotenoids also were influenced negatively. Thus, the reduction of the pigment content started before any obvious influence on the chlorophyll fluorescence. The highest concentration of dichromate, which caused no permanent inhibition of growth and photosynthesis, was found to be 17 M K2Cr2O7. In principle, J. effusus is suitable for constructed wetlands to treat chromium-containing wastewater. Because the stress resistance of J. effusus is limited, the maximum concentration of dichromate in the treated wastewater should not exceed 34 M. The growth parameters, shoot length, and dry weight were sensitive to much lower dichromate concentrations and did react more quickly than the biochemistry-related parameters chlorophyll fluorescence and pigment concentration. Therefore, the example of Juncus effusus shows that the use of only biochemical parameters to define concentration limits for the treatment of dichromate-containing wastewater can lead to incorrect conclusions and result in disturbed long-term operation of the system.
ID 975
dauerhafte UFZ-Verlinkung http://www.ufz.de/index.php?en=20939&ufzPublicationIdentifier=975
Gruber, H., Wießner, A., Kuschk, P., Kästner, M., Appenroth, K.-J. (2008):
Physiological responses of Juncus effusus (rush) to chromium and relevance for wastewater treatment in constructed wetlands
Int. J. Phytoremediat. 10 (2), 79 - 90