Registration Dossier

Environmental fate & pathways

Endpoint summary

Administrative data

Description of key information

Adsorption / desorption:

The adsorption coefficient Koc in soil and in sewage sludge Tetrabutylammonium hydrogen sulphate(CAS No.32503-27-8) was determined by the Reverse Phase High Performance Liquid Chromatographic method according to OECD Guideline No. 121 for testing of Chemicals. The reference substances were chosen according to estimated Koc range of the test substance and generalized calibration graph was prepared. The reference substances were having Koc value ranging from 1.45 to 4.09. The Log Koc value was found to be 3.0468 ± 0.00057at 25°C.

Henry's Law constant:

Henry's Law constant of test substance tetrabutylammonium hydrogen sulphate was estimated to be 0.00000000000399 (3.99E-012)Pa-m3/mole at 25 deg.C

Additional information

Adsorption / desorption:

For adsorption in soil endpoint 2 studies for the test chemical Tetrabutylammonium hydrogen sulphate (Cas no. 32503-27-8) were reviewed as follows:

First study from experimental report by UERL study result;2017 indicate that the adsorption coefficient Koc in soil and in sewage sludge Tetrabutylammonium hydrogen sulphate(CAS No.32503-27-8) was determined by the Reverse Phase High Performance Liquid Chromatographic method according to OECD Guideline No. 121 for testing of Chemicals. The reference substances were chosen according to estimated Koc range of the test substance and generalized calibration graph was prepared. The reference substances were having Koc value ranging from 1.45 to 4.09. The Log Koc value was found to be 3.0468 ± 0.00057at 25°C.

Additional data from prediction model also support the experimental result i.e the Soil Adsorption Coefficient (Koc value) of  Tetrabutylammonium hydrogen sulphate was estimated using EPI suite KOCWIN model (v2.00) as Koc 6325 L/kg (log Koc=3.801) by means of MCI method at 25 deg.C. This Koc value indicates that the substance Tetrabutylammonium hydrogen sulphate has a strong sorption to soil and sediment and therefore has negligible to slow migration potential to groundwater.

Thus both studies give the conclusion that chemical Tetrabutylammonium hydrogen sulphate (Cas no. 32503-27-8) is slow to immobile in soil/sediment.