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Environmental fate & pathways

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According to a Mackay Level I model calculation, the main target compartment for isophorone diamine will be the hydrosphere (99.8 %), followed by sediment and soil (0.08 % each). The calculated Henry’s law constant of 0.000446 Pa m3/mol (HenryWin v3.10) indicates very low volatility of isophorone diamine from surface waters. With a calculated log Koc of 2.97 (pH 7), the sorption potential of isophorone diamine to soil or sediment organic matter is expected to be moderate (Blume scale).

 

The QSAR calculated rate constant for the OH sensitized photodegradation of isophorone diamine is approximately 8.47E-11 cm3/(molecule * s). At 500,000 OH radicals / cm3 (approximate 24-hour mean in central), this corresponds to a half-life of 4.5 hours. The hydrolysis of isophorone diamine as a function of pH was studied according to OECD TG 111. At pH 4,7 and 9, less than 10% of the test substance were observed to hydrolyse at 50 °C within a period of 5 days, demonstrating hydrolytical stability in the environment.. Isophorone diamine was found to be not readily biodegradable (EU method C.4 A "DOC Die-Away Test) and the calculated BCF value shows a low potential for bioaccumulation.