Registration Dossier

Environmental fate & pathways

Endpoint summary

Administrative data

Description of key information

Adsorption/desorption:

The Soil Adsorption Coefficient i.e. Koc value of test chemical  3,4,5,6-tetrachloro-2-(2,4,5,7-tetrabromo-3,6-dihydroxyxanthen-9-yl)benzoic acid, aluminium salt (CAS No. 84473-86-9) was estimated using EPI suite KOCWIN Program (v2.00) as 31340000 L/kg (log Koc= 7.7961) by means of MCI method at 25 deg. C.  This log Koc value indicates that test chemical  3,4,5,6-tetrachloro-2-(2,4,5,7-tetrabromo-3,6-dihydroxyxanthen-9-yl)benzoic acid, aluminium salt has very strong sorption to soil and therefore test chemical has negligible migration potential to ground water.

Additional information

Adsorption/desorption:

Results of predicted data for target chemical 3,4,5,6-tetrachloro-2-(2,4,5,7-tetrabromo-3,6-dihydroxyxanthen-9-yl)benzoic acid, aluminium salt (CAS No. 84473-86-9) and experimental data for its structurally similar read across chemical are summarized below.

In the first study the Soil Adsorption Coefficient i.e. Koc value of test chemical  3,4,5,6-tetrachloro-2-(2,4,5,7-tetrabromo-3,6-dihydroxyxanthen-9-yl)benzoic acid, aluminium salt (CAS No. 84473-86-9) was estimated using Estimation Program Interface (EPI suite, 2017) KOCWIN Program (v2.00) as 31340000 L/kg (log Koc= 7.7961) by means of MCI method at 25 deg. C.  This log Koc value indicates that test chemical  3,4,5,6-tetrachloro-2-(2,4,5,7-tetrabromo-3,6-dihydroxyxanthen-9-yl)benzoic acid, aluminium salt has very strong sorption to soil and therefore test chemical has negligible migration potential to ground water.

Another study was done from Screening Assessment for the Challenge, Environment Canada- Health Canada; November 2008 in this study the Screening Assessment for structurally similar read across chemical 2-(3,6-dihydroxy-2,4,5,7-tetrabromoxanthen-9-yl)-benzoic acid (D&C Red No. 21) the Organic carbon-water partition coefficient i.e., adsorption coefficient (Log Koc) by PCKOCWIN 2000 model was estimated to be 4.276. This log Koc value indicate that the read across chemical 2-(3,6-dihydroxy-2,4,5,7-tetrabromoxanthen-9-yl)-benzoic acid (D&C Red No. 21) has strong sorption to soil and sediment and therefore has negligible to slow migration potential to ground water.

On the Basis of both the studies mentioned above it is concluded that target chemical 3,4,5,6-tetrachloro-2-(2,4,5,7-tetrabromo-3,6-dihydroxyxanthen-9-yl)benzoic acid, aluminium salt (CAS No. 84473-86-9) has strong to very strong sorption to soil and has negligible migration potential to ground water.