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The calcium sulfonate read-across substance (CAS 70024-69-0) attained 8 % degradation during the test duration of 28 days (OECD Guideline 301D, Douglas, 1989) . Based on the results of this study, the calcium sulfonate target substance (Benzenesulfonic acid, di-C10-14-alkyl derivatives, calcium salts) is not expected to be readily biodegradable.