Registration Dossier
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EC number: 232-259-2 | CAS number: 7803-49-8
Long-term toxicity to aquatic invertebrates
Administrative data
Link to relevant study record(s)
Description of key information
May cause long term effects to aquatic inverterates
Key value for chemical safety assessment
Additional information
There is one study available on the long term toxicity of Bis(hydroxylammonium) sulphate to aquatic invertebrates (BASF AG, 2007).
The test was conducted according to OECD 211. Because of the rapid dissociation/degradation of BHAS semi-static test conditions with renewal of test solutions in 24 hour intervals were chosen. In addition concentrations were measured. Samples for analysis were taken once a week during the test. For each concentration the freshly prepared test solution (without daphnia) and the corresponding 24 h old test solution (with daphnia) were analysed. Six (nominal) test concentrations ranging from 0.0156 to 1 mg/l were used. pH values in the test vials ranged from 7.6 to 8.3.
After 21 days of exposure, no effects on reproduction and weight of the parent animals were observed up to the highest concentration tested. Since the length of the daphnids exposed to this concentration was significantly reduced, the NOEC for this endpoint is 0.5 mg/l (nominal, LOEC 1.0 mg/l). Using the mean of the measured concentrations, NOEC and LOEC for the length of the animals are 0.31 mg/l and 0.62 mg/l (corresponding to 0.13 mg/l and 0.25 mg/l hydroxylamine). Since the measured concentrations are below 80 % of the nominal concentrations, the analytically determined concentrations should preferably be used for further assessment.
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