User Guide to Thresholds and Classification - Environmental ...

289User Guide for Thresholds and Classificationsa.of water; andb. that is not readily degradable or is bioaccumulative, or is not readily degradable and isbioaccumulative.Category 9.1D – substances that are slightly harmful to the aquatic environment or are otherwisedesigned for biocidal actionA substance for which data indicate that:i.ii.litre of water, but which does not meet the criteria for hazard classification 9.1B or 9.1C; ornot meet the criteria for hazard classification 9.1A, 9.1B, or 9.1C; orubstance per litre of water, but which doesa substance that is designed for biocidal action, other than a substance that is designed for biocidalaction against a virus, protozoan, bacterium, or an internal organism in humans or in othervertebrates, but does not meet the criteria for any hazard classification in class 9 other than 9.1D; ora substance that is not rapidly degradable and that is bioaccumulative unless the chronic aquaticecotoxicity value is > 1 mg of the substance per litre of water, but does not meet the criteria for hazardclassification 9.1A, 9.1B, or 9.1C.Note that assignment to category 9.1D due solely to biocidal action is discussed chapter 23.The aquatic classification criteria for single component substances are summarised in Table 19.1 and Figure19.2. The application of the criteria to mixtures is set out in more detail in section 19.3.Table 19.1: Aquatic classification of a single component substanceAcute L(E)C 50 of thesubstanceChronic NOEC of thesubstanceSubstance is notrapidly degradable oris bioaccumulativeClassificationcategory for thesubstance1 mg/L 1 mg/L or unknown:1 mg/L > 1 mg/LNot considered for 9.1Aclassification9.1A> 1 and 10 mg/L 1 mg/L or unknown9.1BYes or unknown> 10 and 100 mg/L 1 mg/L or unknown 9.1C> 1 and 10 mg/L > 1 mg/L Yes or unknown;the chronic test data ‗declassify‘> 10 and 100 mg/L > 1 mg/Lsubstance> 10 and 100 mg/L < 1 mg/L No9.1D> 100 mg/L 1 mg/L or unknown Yes or unknown> 100 mg/L > 1 mg/LNo for either property; thechronic test data ‗de-Substance not classified,not hazardous unlessJanuary 2012 EPA0109