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EC number: 239-018-0 | CAS number: 14940-41-1
Short-term toxicity to aquatic invertebrates
Administrative data
Link to relevant study record(s)
Description of key information
Key value for chemical safety assessment
Additional information
Experimental results on the acute toxicity of Triiron bis(orthophosphate) (CAS 14940-41-1) to aquatic invertebrates are not available. The assessment is therefore based on an expert statement regarding the feasibility of a short-term toxicity study and on read-across data. In accordance with Annex XI, 1.5, of Regulation (EC) No 1907/2006, read-across to the structurally related Iron II Sulfate Heptahydrate (CAS 7782-63-0) was conducted to fulfil the standard information requirements. In accordance with Article 13 (1) of Regulation (EC) No 1907/2006, "information on intrinsic properties of substances may be generated by means other than tests, provided that the conditions set out in Annex XI are met.” In particular for aquatic toxicity, information shall be generated whenever possible by means other than vertebrate animal tests, which includes the use of information from structurally related substances (grouping or read-across). According to Annex XI, Item 1.5, of Regulation (EC) No 1907/2006 substances can be considered to be similar if their physicochemical, toxicological and ecotoxicological properties are likely to be similar or follow a regular pattern as a result of structural similarity. For further details please see chapter 6.1 of the IUCLID file.
One study is available for the read across substance Iron II Sulfate Heptahydrate (CAS 7782-63-0). The semi-static study (MOE, 2002) on the acute toxicity of Iron II Sulfate Heptahydrate to Daphnia magna was conducted according to OECD 202. The test organisms were exposed to the test substance for 48 hours to the test concentrations of 22, 32, 46, 68, 100, 150, 220 and 320 mg/L nominal. Analytical determinations were performed to ensure a proper maintenance of the test concentration throughout the experiment. The concentration of iron was measured and the test substance concentration was found by conversion. The time-weighted mean of the measured concentration with respect to the nominal concentration was 13.7, 18.7, 22.6, 27.1, 34.1, 79.3, 143 and 245 mg/L. After 48 hours the immobilisation rates were 0% in 22 mg/L, 5% in 32 and 46 mg/L, 10% in 68 mg/L, 50% in 100 mg/L and 100% in ≥ 150 mg/L. Thus, an EC50 after 48 hours of 91 mg/L (nominal) was determined.
Therefore, based on the available read across data Triiron bis(orthophosphate) (CAS 14940-41-1) is considered not acutely toxic to aquatic invertebrates at levels up to the limit of water solubility of 1.5 mg/L.
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