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Physical & Chemical properties

Partition coefficient

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Description of key information

Log Kow = -3 (tetrasodium salt)
Log Kow = -5.4 (free acid)

Key value for chemical safety assessment

Log Kow (Log Pow):
-3
at the temperature of:
25 °C

Additional information

Log Kow (version 1.68 estimate): -3 as tetrasodium salt and - 5.4 as free acid

A study to determine the partition coefficient was carried out in 1989 according to „revised test guideline" following Forschungsbericht (research report) 106 02 054 (FhG-Schmallenberg, im Auftrage des Umweltbundesamtes) similar to OECD 117. However the HPLC test method is not suitable for very good water soluble stubstances with a log Kow <0, as only log Kow values between 0 and 6 (up to 10) can be determined by this method. For log Kow values < 0, the shake flask method (OECD 107) would be the appropriate method. The result of this study (log Kow <= 0.2) is therefore not taken into consideration for risk assessment.