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EC number: 947-836-0
CAS number: -
Ecotoxicity tests were performed with GeO2 as test substance. From the
data, the ecotoxicity reference values (ERV's) for acute and chronic
toxicity of GeO2 and of the Ge-ion in general, were derived.
the lowest EC50 value of 0.206mg GeO2 /L was observed on the freshwater
diatomea Navicula pelliculosa, in a standard OECD 201 algae test
(Fraunhofer 2017). From this result, a general EC50-based ERV of 0.143mg
Ge/L can be derived for the Ge-ion.
Based on this ERV, GeO2 is classified as acute 1 for aquatic effect.
the lowest EC10 value of 0.1003 mg GeO2/L was also observed on the
freshwater diatomea Navicula pelliculosa, in a standard OECD 201 algae
test (Fraunhofer 2017). From this result, a general EC10 -based ERV of
0.07 mg Ge/L can be derived for the Ge-ion.
To define the chronic classification, it must be established whether or
not the substance can be considered to be (equivalent to) rapidly
degradable or not. To answer this question, the concept of "removal from
the water column" has been developed for the metal substances. To check
the presence of the metal -ion in the water column, (and its related
potential chronic toxicity), metal concentration in a water column is
followed over a given time under experimental conditions. The results on
GeO2 demonstrate that Ge removal from the water column is 80% after 4
weeks . Resuspension of the sediment in the experimental volume does not
result in remobilisation of Ge into the water column. Based on these
results, it is concluded that Ge and its salts are to be considered as
equivalent to rapidly degradable in the water column.
Based on the ERV of 100.3 µg/l, and considering the substance as
equivalent to rapidly degradable, GeO2 is classified as "chronic 3 for
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