Registration Dossier
Registration Dossier
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EC number: 939-718-2 | CAS number: 1474044-80-8
Endpoint summary
Administrative data
Description of key information
Hydrolysis testing for DNNSA can be used for read-across to barium bis( di C8-C10, branched, C9 rich, alkylnaphthalene sulphonate).
The half-life time of DNNSA at 25 °C was:
t½ pH 4: > 1 year, pH 7 > 1 year, pH 9 > 1 year.
Barium bis( di C8-C10, branched, C9 rich, Alkylnaphthalene sulphonate) can be expected to also have a similar rate of hydrolysis.
Testing with DNNSA demonstrated the substance is not readily biodegradable. Barium bis( di C8-C10, branched, C9 rich, alkylnaphthalene sulphonate) is therefore also not readily biodegradable.
Barium DNNSA is not expected to bioaccumulate, as is found in a QSAR calculation based on the logKow. Additional evidence for the low bioaccumulation potential can be seen in the size of molecule (Dmax > 19 Angstroms). Molecules of this size are generally considered to have low bioaccumulation potential due to their reduced uptake and low membrane permeability.
Results of HPLC testing (OECD 121) demonstrated the method was not suitable for Barium DNNSA which is consistent with the guideline caution that the method may be inappropriate for surface acting compounds and low solubility "difficult substances". For the assessment of the adsorption potential of this substance, the Guidance document (Chapter R.7a, 2012) recommends estimates be made using multiplein silicomodels for a sensitivity check, therefore, a calculation of the Koc was conducted using the EPIWIN model KOCWIN and the models developed by Sabljic et al. (1995) which are described in TGD Part III (2003) and utilized by EUSES.
Additional information
Di C8-C10, branched, C9 rich, alkylnaphthalene sulphonate (DNNSA) is an intermediate in the production process of the barium salt (reaction of DNNSA with barium hydroxide/barium carbonate). It is expected that the cation of the target substances has limited influence on the behaviour of the substance and that the part which may become biologically active is the acid (anion). Therefore it is postulated that the effects of the acid and the salt will be similar.
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