An apparatus for fast and sensitive detection of toxic substances in
The 1-Hz-Fluorescence-Toximeter continually determines toxic substances in
water. Algae for the tests are automatically and independently cultivated.
These standardised algae are added to the water sample and the active
chlorophyll concentration is analysed. If the algae are damaged, e.g.
through herbicides which reduce the concentration of active algae, an
alarm is induced. Additionally the 1-Hz fluorescence-toximeter operates as
an instrument for the exact measurement of algae content in water. This
measurement corresponds to that of the bbe 1-Hz fluorimeter 42A03.
Construction of the 1-Hz-Fluorescence-Toximeter:
The cultivation of the algae takes place in a fermenter which is regulated
"turbidostatically" by a second 1Hz-fluorescence measurement. Due to this
regulation the algae concentration is kept in a steady state. For the
measurement water samples are continually pumped through the 1-Hz
fluorometer where the algae concentration is determined. After which a
precisely defined amount of algae is injected into the 1-Hz fluorometer.
The concentration of the additional living algae stays constant as long as
no toxic substances are present. The presence of toxic substances reduces
the concentration of the additional algae.
In order to clean the measuring unit a salt solution is pumped into it
after the measurement. This also hinders the growth of algae in the unit.
The salt solution is reused so as to minimise the consumption. The hoses
of the 1-Hz fluorometer-toximeter are rinsed with the salt solution at
certain intervals so as to stop the growth of algae here as well. The
rinsing rate is adjustable.
Software for analysis:
For the analysis of the results the bbe Dynsprung program is used. It has
already been installed in numerous toximeters. Dynsprung notices jumps -
and therefore also the toxic events - when the measuring results are still
in a blurred state and then increases the sensitivity.
- Measurement of direct chlorophyll fluorescence:
This measurement corresponds to the wet-chemical chlorophyll analysis.
- Measurement of living chlorophyll fluorescence of the water sample
This measurement shows the percent of active chlorophyll and serves as a
- Measuring the transmission of the sample:
This measurement takes place automatically during each analysis so as to
compensate the influence of substances which cause turbidity.
Advantages of the 1Hz-Fluoreszenz-Toximeter:
independent cultivation of algae
cultivation control due to the living chlorophyll measurement
no dosage mistake through ageing hoses
automatic cleansing of the measuring unit and the hoses
reutilization of the cleansing solution
no loss of time through the alarm induction
auto-start after current failure
battery-buffered for data saving
Measuring range 300ng - 500microg/l
Sensitivity <0,1 microg/l Atrazin
Size (HxWxD) 600x380x350mm
Housing steel varnished
Connection charge 200W
Analogue output 2 x 4-20mA
Intersection 2 x RS232
Sample temperature 0 - 30 C
Sample volume 30ml
Data capacity 1000
Maintenance interval > 7 Days
The right to make technical changes is reserved
If you are interested please contact:
D - 24118 Kiel
Telefon + (0) 431/5 606 606
Telefax + (0) 431/5 606 609
BBE.Moldaenke at t-online.de