Daphnia Toximeter

Lechelt, M., Blohm, W., Kirschneit, B., Pfeiffer, M., Gresens, E., Liley, J., Holz, R., Luring, C. and Moldaenke, C. (2000) Monitoring of surface water by ultrasensitive Daphnia toximeter, Environmental Toxicology 15 (5), 390-400. 

In the last few years the Dutch KIWA Research Institute recognized a need for a better guidance for validation of BEWS and took the initiative to try to improve their standardization and to harmonize their use, to ensure better quality assurance, and raise awareness and acceptance of online biomonitoring. To this end they evaluated so far three BEWS that are operational in The Netherlands Daphnia Toximeter, Algae... 

In spring 2004 the Daphnia Toximeter deployed at the RIZA monitoring station alongside the River Meuse in Keizersveer (NL) recorded several alarms. Routine chemical analysis did not reveal the identity of the offending compound(s). It took sophisticated chemical analyses, a combination of HPLC-DAD and Q-TOF MS techniques, to identify the so-far unknown contaminant as 3-cyclohexyl- 1,1-dimethylurea. The maximum concentration of this compound in the River Meuse at the time of the alarm was estimated to be 5 ig/L. The response of the Daphnia to this compound was later confirmed... 

Wagenvoort A., de Hoogh C., Frijns N., Scaf W. and Pieper G., 2008b. Alarm Evaluation of the bbe Daphnia Toximeter and the bbe Algae Toximeter. Examples of alarm events in 2006 and 2007. In KWR report BTO 2008.041, Kiwa Water Research, Nieuwegein, The Netherlands. 

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