68-ME4211 - aquatic and terrestrial ecotoxicities determined from the criteria in Table 4.13(b If lack of data prevents determination of the

Info iconThis preview shows pages 1–5. Sign up to view the full content.

View Full Document Right Arrow Icon
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
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
2
Background image of page 2
(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
Background image of page 3

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
(ii) Ecotoxicity score (a) Determine the substance’s ecotoxicity score as the sum scores for
Background image of page 4
Background image of page 5
This is the end of the preview. Sign up to access the rest of the document.

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 ....
View Full Document

This note was uploaded on 12/07/2011 for the course ME ME4211 taught by Professor Dr.a.vyas during the Winter '11 term at NYU Poly.

Page1 / 5

68-ME4211 - aquatic and terrestrial ecotoxicities determined from the criteria in Table 4.13(b If lack of data prevents determination of the

This preview shows document pages 1 - 5. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online