Algae Toximeter II

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An instrument for the fast and sensitive detection of toxic substances in water
The bbe Algae Toximeter continuously monitors water for the presence of toxic substances. Standardised algae are mixed with the sample water and the instrument detects the photosynthetic activity of the algae. Damage to the algae, caused e.g. by herbicides, causes a reduction in algae activity and activates an alarm above a pre-defined threshold.
The bbe Algae Toximeter also serves as a measuring instrument for the precise determination of algal concentrations in water. Algae group differentiation – applied to the sample water – enables  the quantitative allocation to different spectral algal classes. This measurement principle corresponds to that of bbe’s tried and tested fluorometric instruments: the AlgaeOnlineAnalyser and AlgaeLabAnalyser.
The current version of the bbe Algae Toximeter works with a double test loop for sample incubation, short measuring intervals and a PC for online data analysis, which optionally allows a high temporal resolution of the water to be monitored. An alternative version of the Algae Toximeter enables the incubation of the sample within the measuring chamber without sample loops thus resulting in less maintenance with longer measurement cycles.
Principles of the bbe Algae Toximeter
The cultivation of the algae takes place in a fermenter, which is regulated “turbidostatically” by a second fluorescence measurement. This regulation ensures that the algae and their activity are maintained.
The measurement procedure requires the water samples be almost continually pumped into the bbe Algae Toximeter, in which the concentration and the activity of the naturally occurring algae are determined. A precisely defined amount of algae from the fermenter is then added to the measuring chamber by way of a loop. The activity of the added algae remains constant as long as no toxic substances are present. If any toxic substance is present, its interaction with the photosynthesis centre leads to an inhibition of algal activity. The dimensions of the inhibition can be estimated by comparing the algal activity with and without water sample.
After each measurement, the measuring chamber is automatically cleaned by a piston. This prevents the growth of algae and biofilms within the measuring chamber.

  • Technical Data
  • Features
  • Applicatons
  • Brochure 
DESCRIPTION VALUE
Measurands
  • inhibition of photosynthesis
  • total chlorophyll [µg Chl-a/l]
  • concentration of green algae [µg Chl-a/l]
  • concentration of cyanobacteria [µg Chl-a/l]
  • concentration of diatoms [µg Chl-a/l]
  • concentration of cryptophytes [µg Chl-a/l]
  • yellow substances
  • photosynthetic activity (Genty)
  • transmission (at 5 wavelengths)
Inhibition 0 – 100%
Inhibition: Measurement procedure comparison of photosynthesis activity between sample and control
Chlorophyll 0 – 200 µg Chl-a/l
Chlorophyll: Measurement procedure spectral fluorometry
Resolution 0.05 µg Chl-a/l
Transmission 0 – 100% (for measurements max. 100 FTU)
Transmission: Measurement procedure photometry
Measuring chamber cleaning automatic cleaning piston
Housing material varnished steel plate
Weight 160 kg
Dimensions (H x W x D) 1100 x 600 x 680 mm
Protection class IP54
Mains supply 110/240V 50/60Hz
Power consumption 600 W
Temperature Sample: 0 – 30 °C / Environment: 10 – 28° C
Sample volume 30 ml
Maintenance interval > 7 days
Sample intake free intake/tube pump
OS Windows
Memory 256MB
Harddisk 40GB
Outputs
  • modem
  • LAN
  • analogue output 4-20 mA (2 X)
  • relay output (2 X)
  • RS232

 

  • highly sensitive with regard to the detection of herbicides and their by-products
  • sensitive to a wide range of toxic substances
  • controlled independent cultivation of algae
  • cultivation control due to active chlorophyll measurement
  • no exclusion period after alarm
  • anti-fouling system due to automatic cleaning of the measuring unit
  • autostart function after power failure
  • CE-sign

  • drinking water supply
  • dam monitoring
  • waterway analysis and assessment
  • general environmental assessment
  • intake monitoring
  • chemical analysis
  • limnological work
  • research and education

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