Registration Dossier
Registration Dossier
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EC number: 439-070-6 | CAS number: 125005-87-0
Endpoint summary
Administrative data
Description of key information
Additional information
The results of the short-term toxicity limit test conducted on freshwater fish (Rainbow trout) show that the test material, Diutan, is of low toxicity to fish in the freshwater environment as no mortality or sub-lethal effects were observed during the study (96hr NOEC = 100 mg ai/L). The results of short-term toxicity test conducted on marine fish (Turbot) showed mortality occurred during the study leading to a 96h EC50 value of ca. 260 mg/L. However, the mortality observed was noted at test concentrations which saw a marked reduction in the dissolved oxygen concentration (DO) to levels outside those permitted by the validation criteria of the test method. Due to these deficiencies within this test, the results are not considered valid and cannot be used in the CSA. As a conservative measure the LC50 for marine fish to be used in the CSA will be set the same as the freshwater value.
The results of the short-term toxicity tests (selected as key studies) to Daphnia magna (freshwater) and to Acartia tonsa (marine), showed no mortality at limit concentration and a 48hr EC50 value of 250 mg/l respectively. It can be concluded that the test material Diutan is of low toxicity to invertebrates based on these observed results.
Based on the results of the short-term toxicity limit tests to algae conducted on freshwater and marine species, it can be concluded that the test material Diutan is of low toxicity to algae. No Observed Effect Concentrations were reported as 100 mg a. i/L and 1000 mg/L for freshwater and marine, respectively.
The results for the Activated Sludge Respiration Inhibition Test (ASRIT) show that the test material Diutan is of low toxicity to microorganisms. No inhibition of respiration rates was recorded in the study in fact oxygen consumption increased in the presence of the test material. The No Observed Effect Concentration was 1000 mg ai/L.
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