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Environmental fate & pathways

Endpoint summary

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Description of key information


The Adsorption Coefficient of test substance  was determined as per the HPLC method (OECD Guideline-121). The Log Koc value was determined to be 2.474 ± 0.0008 at 25°C. Thus based on the result it is concluded that the test substance  has moderate sorption to soils and sediment, slow migration potential to ground water

Additional information


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 6 mg of test item and diluted with acetonitrile up to 10 ml. Thus, the stock solution concentration was 600 mg/l. This was further diluted by taking 1mL stock solution and making up the volume up to 10mL with acetonitrile. Thus, the final test solution concentration was 60 mg/L. The pH of test substance was 6.86. 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 aniline, 4 -methylaniline, N-methylaniline, toluene, xylene, ethylbenzene and naphthalene were chosen having Koc value range from 1.9 to 2.75. The Log Koc value of test material was determined to be 2.474 ± 0.0008 dimensionless at 25°C.This log Koc value indicates that the substance has Moderate sorption to soils and sediment, slow migration potential to ground water.