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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.

The new ECHA CHEM database has been released by ECHA, and it now contains all REACH registration data. There are more details on the transition of ECHA's published data to ECHA CHEM here.

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Physical & Chemical properties

Partition coefficient

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Description of key information

The partition Coefficient n-octanol/water of diphenyl acetic acid(CAS No.117-34-0) was determined by the Reverse Phase High Performance Liquid Chromatographic method according to OECD Guideline No. 117 for testing of Chemicals. The reference substances were chosen according to functional group similarity with the test substance and calibration graph was prepared. The reference substances were biphenyl, cinnamic acid, 3-methylbenzoic acid, dodecanoic acid, n-butylbenzene and naphthalene having Pow value ranging from 2.1 to 4.6. TheLog Pow value was determined to be 3.1729 ± 0.0178 at 25°C.

Key value for chemical safety assessment

Log Kow (Log Pow):
3.17
at the temperature of:
25 °C

Additional information

The partition Coefficient n-octanol/water of diphenyl acetic acid(CAS No.117-34-0) was determined by the Reverse Phase High Performance Liquid Chromatographic method according to OECD Guideline No. 117 for testing of Chemicals. The reference substances were chosen according to functional group similarity with the test substance and calibration graph was prepared. The reference substances were biphenyl, cinnamic acid, 3-methylbenzoic acid, dodecanoic acid, n-butylbenzene and naphthalene having Pow value ranging from 2.1 to 4.6. TheLog Pow value was determined to be 3.1729 ± 0.0178 at 25°C.

The experimental octanol - water partition coefficient of diphenyl acetic acid was also determined using Shake – flask method. The study was performed at ambient temperature (i.e 25 deg C).The aqueous phase was analyzed using absorption spectroscopy. The experimental logKOW value for diphenyl acetic acid was determined to be 2.6 at 25 deg C.

Both the experimental values suggests that diphenyl acetic acid is hydrophillic in nature which is also supported by its solubility in water.