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Environmental fate & pathways

Adsorption / desorption

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Description of key information

Key value for chemical safety assessment

Koc at 20 °C:
0.82

Additional information

According to the REACH Regulation (EC n. 1907/2006), annex VIII, column 2,the study regarding adsorption/desorption does not need to be conducted if based on the physicochemical properties, the substance can be expected to have a low potential for adsorption (e.g. the substance has a low octanol- water partition coefficient).

Partition coefficient cannot be measured for inorganic salt.

Tetraphosphorus trisulphide has an estimated value of log Kow = - 0.23 calculated by EPI Suite v.4.11 even though inorganic salts are out of the applicability domain (SMILES notation used as input for prediction: S1P2P3P2SP1S3). This estimated value of log Kow is very low.

A predicted value for partition coefficient organic carbon-water was calculated by EUSES 2.1.2 Koc = 0.82 l/kg considering the substance as predominantly hydrophobics. This value was used by CHESAR for chemical safety assessment. Considering this predicted value, a low adsorption potential is expected. As reported in ECHA Guidance Chapter R.7b: in general substances with a Koc <500 – 1000 l/kg are not likely sorbed to sediment (SETAC 1993).