64-ME4211 - 4.3 Calculate the Toxicity Potentials (i) Find...

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Unformatted text preview: 4.3 Calculate the Toxicity Potentials (i) Find the substance’s equivalency factors for the relevant emission route in Table 4.9. Table 4.9 presents equivalency factors EF for around 90 compounds emitted to air, water or soil. (ii) Calculate the human toxicity potentials for the relevant exposure routes by multiplying the magnitude of the emission with the equivalency factors found: EP(ht) = Q x EF(ht) (4.16) 1 2 3 4 • As for ecotoxicity, it has been necessary in the EDIP method to develop a way by which toxicity potentials can be calculated for exposure of humans in the environment. The EDIP method of calculation of human toxicity potentials was also inspired by the EU Commission‘s technical guidelines for risk assessment of chemicals in the environment. Up to four toxicity potentials are calculated for each substance: (i) EP(hta) = Q · EF(hta) for toxicity to humans via air (4.17) (ii) EP(htw) = Q · EF(htw) for toxicity to humans via surface water (4.18) (iii) EP(hts) = Q · EF(hts) for toxicity to humans via soil (4.19) (iv) EP(htg) = Q · EF(htg) for toxicity to humans via groundwater (4.20) 5 •...
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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.

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64-ME4211 - 4.3 Calculate the Toxicity Potentials (i) Find...

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