Registration Dossier

Data platform availability banner - registered substances factsheets

Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.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

Diss Factsheets

Environmental fate & pathways

Endpoint summary

Administrative data

Description of key information

Adsorption / desorption

The adsorption coefficient Koc in soil and in sewage sludge of test chemical was determined by the Reverse Phase High Performance Liquid Chromatographic method according to OECD Guideline No. 121 for testing of Chemicals. The solutions of the test substance and reference substances were prepared in appropriate solventsA test item solution was prepared by accurately weighing 5 mg of test item and diluted with Acetonitrile up to 10 ml. Thus, the test solution concentration was 500 mg/l. The pH of test substance was 6.6.Each of the reference substance and test substance were analysed by HPLC at 210 nm. After equilibration of the HPLC system, Urea was injected first, the reference substances were injected in duplicate, followed by the test chemical solution in duplicate. Reference substances were injected again after test sample, no change in retention time of reference substances was observed. Retention time tR were measured, averaged and the decimal logarithms of the capacity factors k were calculated. The graph was plotted between log Koc versus log k. The linear regression parameter of the relationship log Koc vs log k were also calculated from the data obtained with calibration samples and therewith, log Koc of the test substance was determined from its measured capacity factor. The reference substances Xylene, Ethylbenzene, Toluene, Naphthalene, Phenol, phenanthrene were chosen having Koc value range from 1.32 to 4.09.The Log Koc value of test chemical was determined to be 1.759 ± 0.001 dimensionless at 25°C.This log Koc value indicates that the substance has a low sorption to soil and sediment and therefore have moderate migration potential to ground water.

Additional information

Adsorption / desorption

Various experimental study of the target chemical were reviewed for the adsorption end point which are summarized as below:

 

In an experimental study from study report (2017), the adsorption coefficient Koc in soil and in sewage sludge of test chemical was determined by the Reverse Phase High Performance Liquid Chromatographic method according to OECD Guideline No. 121 for testing of Chemicals. The solutions of the test substance and reference substances were prepared in appropriate solvents. A test item solution was prepared by accurately weighing 5 mg of test item and diluted with Acetonitrile up to 10 ml. Thus, the test solution concentration was 500 mg/l. The pH of test substance was 6.6.Each of the reference substance and test substance were analysed by HPLC at 210 nm. After equilibration of the HPLC system, Urea was injected first, the reference substances were injected in duplicate, followed by the test chemical solution in duplicate. Reference substances were injected again after test sample, no change in retention time of reference substances was observed. Retention time tR were measured, averaged and the decimal logarithms of the capacity factors k were calculated. The graph was plotted between log Koc versus log k. The linear regression parameter of the relationship log Koc vs log k were also calculated from the data obtained with calibration samples and therewith, log Koc of the test substance was determined from its measured capacity factor. The reference substances Xylene, Ethylbenzene, Toluene, Naphthalene, Phenol, phenanthrene were chosen having Koc value range from 1.32 to 4.09.The Log Koc value of test chemical was determined to be 1.759 ± 0.001 dimensionless at 25°C.This log Koc value indicates that the substance has a low sorption to soil and sediment and therefore have moderate migration potential to ground water.

 

For the test chemical, the Koc of test chemical was estimated to be 630, using a structure estimation method based on molecular connectivity indices. This estimated Koc value suggests that test chemical was expected to have low mobility in soil.

 

Thus, on the basis of above information, the logKoc value of the test chemical was determined to be ranges from 1.75 to 2.79, respectively, indicating the substance has a low to moderate sorption to soil and sediment and therefore have moderate to slow migration potential to ground water.