Registration Dossier

Environmental fate & pathways

Endpoint summary

Administrative data

Description of key information

Additional information

Stability:

Phototransformation in air:

The atmospheric oxidation half-life of diiodohydroxyquinoline was estimated using the level III multimedia model. It was estimated that the substance is not persistent in air medium as the half life period of diiodohydroxyquinoline in air is 1.8 days. This indicates that diiodohydroxyquinoline is easilyphototransformed in air.

Hydrolysis:

The Hydrolysis rate constant of diiodohydroxyquinoline is estimated to be 0.0000000000088062 (8.8062 E-12) cm3/molecule-sec. at half life of the 14.575 hrs. The estimated half life of the substance indicates that the substance is moderately hydrolysable.

Biodegradation:

Biodegradation in water: screening tests:

The substance diiodohydroxyquinoline is 50% biodegradable in water in 38 days (half-life). This value indicates that diiodohydroxyquinoline is readily biodegradable in water since the half life is less than the EPA criteria of >= 60 days (to qualify the chemical as persistent).

Hence, it can be concluded that the substance diiodohydroxyquinoline is not persistent in water.

Biodegradation in water and sediment: simulation tests:

The substance diiodohydroxyquinoline is 50% biodegradable in water and sediment in 38 days and in 340 days respectively. This values indicates that diiodohydroxyquinoline is readily biodegradable in water while is not readily biodegradable in sediment according to the EPA criteria of >= 60 days (to qualify the chemical as persistent).

Hence, it can be concluded that the substance diiodohydroxyquinoline is not persistent in water while it is persistant in sediment.

Biodegradation in soil:

The substance diiodohydroxyquinoline is 50% biodegradable in soil in 75 days (half-life). This value indicates that diiodohydroxyquinoline is not readily biodegradable in soil since the half life is more than the EPA criteria of >= 60 days (to qualify the chemical as persistent).

Hence, it can be concluded that the substance diiodohydroxyquinoline is persistent in soil.

Bioaccumulation: aquatic / sediment:

In general it is considered that bioaccumulation is the process by which the chemical concentration in an aquatic organism achieves a level that exceeds that in the water, as a result of chemical uptake through all possible routes of exposure. The relationship between bioaccumulation and bio-concentration is that, chemicals that have the potential to bioconcentrate also have the potential to bioaccumulate.

So, based on this information the estimated BCF factor of diiodohydroxyquinolineis estimated to be 200. This value indicates that diiodohydroxyquinolineis not expected to bioaccumulate in the food chain because it does not exceed the EPA bioconcentration criteria of 1000.

Adsorption / desorption:

According to EPI (Estimation Programs Interface) Suite, soil adsorption coefficient (Koc) value for diiodohydroxyquinoline was estimated to be 5425 at 25°C by MCI method. This value indicates that diiodohydroxyquinoline is non mobile in soil. This value is equivalent to 4340 at 20°C.