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68-ME4211 - aquatic and terrestrial ecotoxicities...

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3.1 Ecotoxicity In the environmental hazard classification, chemicals are assigned relevant risk phrases on the basis of their environmental characteristics . The risk phrases are given in Table 4.11. They often appear in combinations (e.g. R50/R53 ), but they are used individually in the screening method. 1
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(i) Exposure score (a) Determine the exposure score as the sum of the scores for expected emission and for labelling with R53 or R58 on the basis of the criteria in Table 4.12. (b) If both scores are zero, assign the exposure score the value 1. (c) If lack of data prevents determination of the exposure score, assign it the maximum value of 8. The criteria for the exposure score are given in Table 4.12. 3 Table 4.12
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(ii) Ecotoxicity score (a) Determine the substance’s ecotoxicity score as the sum scores for
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Unformatted text preview: aquatic and terrestrial ecotoxicities determined from the criteria in Table 4.13. (b) If lack of data prevents determination of the ecotoxicity score, assign it the maximum value of 8 unless the substance is well known and considered by experts within the area to be free of significant hazardous impacts. 4 The criteria for assignment of the ecotoxicity score are given in Table 4.13. Table 4.13. The ecotoxicity score is the sum of the scores for aquatic and terrestrial ecotoxicity. (iii) Ecotoxicological impact score (a) Determine the substance’s ecotoxicological impact score as product of exposure score and ecotoxicity score . 5 Emissions with ecotoxicological impact scores of 16 or more should be regarded as potentially critical ....
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