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Although the log Kow of -1.25 does not indicate adsorption potential, the substance might adsorb to soil due to its ionisable structure. Read across to the structurally similar substance TETA (CAS 112 -24 -3) was performed to assess the adsorption potential. The adsorption potential was determined according to OECD 106. The resulting log Koc values range between 3.2 and 3.7 depending on the type of the soil (geometric mean: log Koc = 3.49; Koc = 3090.3 L/kg), indicating that adsorption to the solid soil phase is to be expected.

However, there is no indication of high adsorption to soil as defined in the REACh Guidance Document R.7C (log Koc > 5). Since the test substance is readily biodegradable (according to OECD criteria), it is not persistent. Moreover, there is no indication that the substance is very toxic to aquatic organisms since the EC/LC50 values for short-term effects on fish, daphnids and algae are > 1 mg/L. Following this evaluation the test substance can be classified into the soil hazard category 1 (Table R.7.11 -2).

For substances classified in hazard category 1, a screening of the risk assessment for soil organisms should be done on the basis of the equilibrium partitioning method.

The results of the safety assessment indicate that there is no apparent risk of 3,3'-Iminodi(propylamine) to the environment. Hence, toxicity testing for soil organisms does not need to be performed. Moreover, direct and indirect exposure of the soil compartment is unlikely. The test substance is not supposed to be directly applied to soil. Indirect exposure to soil is unlikely to occur in significant dimensions since, if any, relevant amounts of the substance will reach industrial STPs rather than domestic STPs. Sludge of industrial STPs will usually not be applied on agricultural soil but will be incinerated. Therefore, exposure to soil can be neglected.