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EC number: 276-851-9
CAS number: 72797-41-2
One valid main study was performed.
As the test item is poorly soluble in water, a saturated solution was
prepared. this was done by shaking the nominal load with the appropriate
amount of deionised water for 24 hours, followed by membrane filtration.
The lower treatments were prepared by dilution of this saturated
The study was performed using three concentrations containing 1, 10 and
The treatments were used to incubate the unicellular freshwater green
alga Desmodesmus subspicatus for a period of 72 hours. The cell
concentration of each replicate was determined by measuring the
absorption of the cuvettes at 440 nm every 24 hours with a spectral
photometer. With there measured values, the number of cells was
calculated (linear correlation between cell concentration and adsorption
given). Then the
growth rate, the area under the growth curve and the yield were
The EC50s of potassium dichromate were tested in a current reference
test. The values lay within the normal range of the laboratory.
The following results for the tests item were determined :
72h LOEC> 100mg/L (growth tae and biomass)
72h EC50 (growth rate and biomass) > 100mg/L
72h NOEC (growth rate and biomass) = 100 mg/L
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