Registration Dossier
Registration Dossier
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EC number: 939-867-3 | CAS number: -
Endpoint summary
Administrative data
Description of key information
Additional information
According to the data requirements outlined in EU Regulation No. 1907/2006, only screening tests in water are mandatory for this tonnage band.
In this context, both ready and inherent biodegradation of Mn(2Na)IDHA was experimentally investigated which is considered in detail in the following.
The inherent biodegradability of Mn(2Na)IDHA was investigated according to OECD Guideline 302B (Chojnacka, 2014). As starting point, an initial test concentration of 100 mg DOC/L was used. The test was performed for 28 days. Degradation was followed by DOC determinations at 0 h, 3 h, 1 d, 7 d, 14 d, 21 d, 27 d and 28 d. After 28 days, 83.4 % degradation of the test item was obtained. The reference compound benzoic acid sodium salt showed 100 % degradation after 14 days. In conclusion and according to the criteria set out by OECD Guideline 302B, the substance Mn(II)-IDHA is inherently biodegradable under the test conditions.
The biodegradation of Mn(2Na)IDHA and other metal complexes of IDHA was additionally investigated according to OECD Guideline 301F (Cokesa et al., 2004). The test was carried out with the OxiTop Control system (WTW, Weilheim, Germany) and monitored for 42 days. Exact substance concentrations were not indicated in the publication. During the test, precipitation of the corresponding heavy metal hydroxide was observed, indicating liberation of free metal ions. Based on O2 consumption, Mn(2Na)IDHA revealed 55 % degradation after 28 days. The authors assume that prolonged exposure to the released Mn(II) ions led to inactivation of the microorganisms. No toxicity control has been conducted. It was shown that the test substance Mn(II)IDHA (also known as Mn-IDS and Mn(2Na)IDHA) is potentially biodegradable under the test conditions. Since sufficient experimental details (i.e. test substance concentrations) are missing and no toxicity control is mentioned, exact conclusions on the ready biodegradability of the test substance cannot be drawn.
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