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Environmental fate & pathways

Endpoint summary

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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 (Experimental study report, 2019). The solutions of the test substance and reference substances were prepared in appropriate solvents. The sample of test chemical was prepared by adding 10 mg in acetonitrile to prepare 1000 mg/L test solution, sonicated for 1 mins and filtered through 0.22 μm nylon syringe filter. pH of the resulting solution was 7.4. The analysis was performed at constant recommended conditions such as temperature 25°C (solvent: water) ratio 55:45 at the flow rate of 1 mL/min at 210 nm. The reference substances were chosen according to estimated Koc range of the test substance and generalize calibration graph was prepared. Selected reference substances and test chemical were prepared in acetonitrile with concentration of 400 mg/L. Both were analyzed on HPLC considering the similar conditions. After analyzing on above conditions calibration curve of selected reference substances was prepared to obtain log Koc value. The reference substances were p-Toluamide, Aniline, N-methylaniline, 4-Chloroaniline, phenanthrene, Naphthalene, DDT, having Koc value ranging from 1.8 to 2.9. The Log Koc value was test chemical was determined to be 2.787±0.001 at 25°C. Thus, based on the result it is concluded that the test chemical has a moderate sorption to soil and sediment and therefore have slow migration potential to ground water.

Additional 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 (Experimental study report, 2019). The solutions of the test substance and reference substances were prepared in appropriate solvents. The sample of test chemical was prepared by adding 10 mg in acetonitrile to prepare 1000 mg/L test solution, sonicated for 1 mins and filtered through 0.22 μm nylon syringe filter. pH of the resulting solution was 7.4. The analysis was performed at constant recommended conditions such as temperature 25°C (solvent: water) ratio 55:45 at the flow rate of 1 mL/min at 210 nm. The reference substances were chosen according to estimated Koc range of the test substance and generalize calibration graph was prepared. Selected reference substances and test chemical were prepared in acetonitrile with concentration of 400 mg/L. Both were analyzed on HPLC considering the similar conditions. After analyzing on above conditions calibration curve of selected reference substances was prepared to obtain log Koc value. The reference substances were p-Toluamide, Aniline, N-methylaniline, 4-Chloroaniline, phenanthrene, Naphthalene, DDT, having Koc value ranging from 1.8 to 2.9. The Log Koc value was test chemical was determined to be 2.787±0.001 at 25°C. Thus, based on the result it is concluded that the test chemical has a moderate sorption to soil and sediment and therefore have slow migration potential to ground water.