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Environmental fate & pathways

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The tested substance is not hydrolysable, not biodegradable and does not bioaccumulate based on experimental result of Kow value.

Release to air, an estimated vapour pressure of 10 -39 Pa at 25 °C indicates that Direct Red 81 will not exist if not in dust particles in the atmosphere. In vapour-phase Direct Red 81 will be slowly degraded in the atmosphere by reaction with photochemically-produced hydroxyl radicals; degradation in sunlight also occurs.

If released to soil, Direct Red 81 is expected to have high mobility based upon an estimated Koc of 412.8. Substance with a Koc below 500-1000 are generally unlikely to adsorb to sediment.

Volatilization from moist soil surfaces is not expected to be an important fate process based upon an estimated Henry's Law constant of 2.03 10E-32atm-m3/mole.

The substance is not ready biodegradable. If released into water, Direct Red 81 is not expected to adsorb to suspended solids and sediment based upon the measured Koc.

Estimated volatilization half-lives for a model river and model lake are about 1032days.

An estimated BCF of 3.162 suggests the potential for bioconcentration in aquatic organisms is low. Direct Red 81 doesn’t hydrolyzes easily.