Registration Dossier
Registration Dossier
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EC number: 231-665-7 | CAS number: 7681-38-1
Toxicity to terrestrial plants
Administrative data
Link to relevant study record(s)
Description of key information
Key value for chemical safety assessment
Additional information
One publication in which a test with three species is described (Croser et al., 2001) was valid with restriction. The methods were not standardised, but described in detail. They tested three coniferous species of which Pinus banksiana appeared to be the most sensitive to sodium sulfate and the roots appeared to be the most sensitive part of the plant. Root length and the number of lateral roots were affected at 10 mM (1.4 g/l). The sand was moistened with treatment solutions and it is not known how much sand was used. It is therefore not possible to convert the test solution concentrations to sand concentrations.
It is not possible to give a true EC50, NOEC or LOEC value.
Sodium sulfate dissociates in water and does not adsorb onto soil. Terrestrial organisms are therefore exposed mainly via porewater. The equilibrium partitioning method which uses the aquatic PNEC, can be used for estimation of the PNEC for terrestrial organisms because exposure takes place via porewater. From the available plant studies it can be seen that plants are not very sensitive as the treatment solution of 10 mM (1.4 g/l) does not give a significant effect.
A new study is therefore not necessary.
Read-across from sodium sulfate to sodium hydrogensulfate is considered justified. Therefore it can be concluded that sodium hydrogensulfate has no toxic to plants.
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