4.1.2.Inherent Biodegradability TestsU.K.
At least one of the tests referred to below shall be included:
method of the Directive 67/548/EEC, Annex V.C.12 (Modified SCAS test),
method of the Directive 67/548/EEC, Annex V.C.9 (Zahn-Wellens).
Failure to pass the inherent biodegradability test would indicate potential for persistency which may be considered, in general terms, as sufficient to prohibit the placing on the market of such a surfactant except in cases where the criteria set out in Article 6 indicate that there is no justification for refusing a derogation.