Registration Dossier
Registration Dossier
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EC number: 204-185-0 | CAS number: 117-34-0
Endpoint summary
Administrative data
Description of key information
Adsorption / desorption
The adsorption coefficient Koc in soil and in sewage sludge diphenyl acetic acid(CAS No.117-34-0) was determined by the Reverse Phase High Performance Liquid Chromatography method according to OECD Guideline No. 121 for testing of Chemicals. The reference substances were chosen according to functional group similarity with the test substance and calibration graph prepared. The reference substances were xylene,ethylbenzene, toluene, naphthalene and phenanthrene having Koc value ranging from 2.369 to 4.09. The Log Koc value was found to be 0.6316 ± 0.0131 at 25°C.
Additional information
Adsorption / desorption
Two studies including experimental study and predicted data from validated model for adsorption (KOC) endpoint of target chemical 1,1-Diphenylacetic acid (Cas no. 117-34-0) were summarized as follows:
First study from experimental report by UERL laboratory; 2017 which suggest the adsorption coefficient Koc in soil and in sewage sludge diphenyl acetic acid(CAS No.117-34-0) was determined by the Reverse Phase High Performance Liquid Chromatography method according to OECD Guideline No. 121 for testing of Chemicals. The reference substances were chosen according to functional group similarity with the test substance and calibration graph prepared. The reference substances were xylene,ethylbenzene, toluene, naphthalene and phenanthrene having Koc value ranging from 2.369 to 4.09. The Log Koc value was found to be 0.6316 ± 0.0131 at 25°C.
Above result supported by predicted model Chemspider - ACD/PhysChem Suite, indicate the soil adsorption coefficient i.e Koc value of test substance 1,1-Diphenylacetic acid was estimated to be 3.94 (log koc: 0.59) at pH 7.4 and temp.25 deg.C Koc values at mentioned pH indicates that the substance 1,1-Diphenylacetic acid has negligible sorption to soil and sediment and therefore have rapid migration potential to groundwater.
Thus both studies for adsorption endpoint gives the common conclusion that the test substance 1,1-Diphenylacetic acid (Cas no. 117-34-0) is expected to have high mobility in soil and sediment compartment.
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