The mussel monitor at Beegden monitoring station along the River Meuse generated 360 Close
Alarms in a 15-month period (July 2006 through October 2007), with a total duration of more than
600 hours. Maintenance, malfunctioning and tests caused "false" Close Alarms in 13.9 % (50) of
the cases. Data evaluation using the data of the online sensors and the bbe Algae Toximeter
illustrated the effects of slowly decreasing oxygen levels and turbidity on the valve movement of
the Zebra Mussel. A correlation between these parameters and the valve movement was found
in 8.9% (32) and 18.1% (65) of the cases respectively. These 40.8% (147) Close Alarms were
left out of the further data analysis. Of the remaining 213 Close Alarms, 75 (32.5%) were
analyzed further, and (extra) samples at the beginning of the Close Alarm were screened for
pollutants. Based on the data evaluation, putting effort into the identification of the unknown
compounds that caused the alarms is recommended. The results are used to propose a priority
list for unknown compounds to be identified. Includes 7 references, tables, figures.
| Edition : | Vol. - No. |
| File Size : | 1
file
, 1.8 MB |
| Note : | This product is unavailable in Ukraine, Russia, Belarus |
| Number of Pages : | 15 |
| Published : | 11/01/2009 |
