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EC number: 232-259-2 | CAS number: 7803-49-8
Toxicity to aquatic algae and cyanobacteria
Administrative data
Link to relevant study record(s)
Description of key information
Acute very toxic to aquatic algae
Key value for chemical safety assessment
Additional information
There are three studies available on the toxicity of bis(hydroxylammonium) sulphate to algae.
The inhibition of algal growth using the green algae Scenedesmus subspicatus was examined according to the german national standard guideline DIN 38412 Part 9. The test was conducted using OECD medium and eight (nominal) concentrations between 0.04 and 5.0 mg/l without analytics. PH was measured as 8.4 – 8.7 at the beginning of exposure and 8.6 - 10.0 at the end of the study. After 72 hours of static exposure an EC50 of 0.72 mg/l (corresponding to 0.29 mg/l hydroxylamine) was calculated. EC20 and EC90 were determined to be 0.42 and 1.24 mg/l. Since the concentrations were not verified analytically, the test is only valid with restrictions. The substance is not volatile, very good soluble in water and expected to remain in the water phase. Hence, the results based on nominal concentrations seem to be reliable and my be used for classification and labelling, and to assess the risk for aquatic algae.
In addition to this test two studies were published in literature. In a screening study of 1952 (Fitzgerald et al.), 300 chemicals were screened for herbicidal activity. The blue-green algae Micocystis aeruginosa was used as test organism. The intention of the study was to screen for a herbicidal substance inhibiting the growth of blue-green algae without effects on other aquatic species. Effects were determined by visual estimation. The ErC100 estimated for bis(hydroxylammonium)sulphate in this 24 hour test was 2.0 mg/l. However, the study is neither suitable for classification and labelling purposes nor for risk assessment. The results are only reliable as indicative, additional information.
The result of the algae test is confirmed by a publication of the National Association of Photographic Manufactures (1974) where among other substances the effects of bis(hydroxylammonium)sulphate on the green algae Selenastrum capricornutum were tested in a provisional static system for 7 days. While no effects on growth were observed up to 0.1 mg/l, growth of the population was inhibited significantly at 1.0 mg/l. However, no detailed information about the test was submitted and no concentrations were measured. Hence, the test is only of indicative value and neither useful for classification and labelling nor for risk assessment purposes.
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