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EC number: 202-947-7 | CAS number: 101-50-8
Adsorption / desorption
Administrative data
Link to relevant study record(s)
Description of key information
From EPI suite KOCWIN Program (v2.00) predicted model the soil adsorption coefficient (Koc) value of 4-aminoazobenzene-3, 4’-disulphonic acid is estimated to be 871.3 L/kg i.e log Koc=2.9401 at 25 deg C,this log Koc value indicating that it is has a Moderate sorption to soil and sediment and therefore have slow migration potential to groundwater.
Key value for chemical safety assessment
- Koc at 20 °C:
- 871.3
Additional information
By applying Weight of evidence approach for the target substance 4-aminoazobenzene-3, 4’-disulphonic acid (Cas no.101-50-8) studies are summarized as fallowed:
Both predicted sources i.e EPI Suite and PBT profiler indicate that the test substance4-aminoazobenzene-3, 4’-disulphonic acidhas a moderate sorption to soil and sediment and slow migration potential to groundwater.
With following Koc values:
EPI SUITE - 871.3 (Log Koc=2.9401)
PBT profiler -870 (Log KoC=2.939)
Other weight of evidence studies for read across chemical from Scientific Bulletin journal (UPB Scientific Bulletin, Series B; Vol. 78, Iss. 1, 2016 P.137-148) indicate that the Soil adsorption test was conducted for test chemical tartrazine by using sorption floatation method.
Initial concentration of test chemical was 5-500 mg/L with pH range of 7-9 at temperature 20 deg C were selected to study tartrazine removal efficiency.
The removal efficiency of chemical tartrazine was found to be 9% using soil as adsorbent in sorption floatation technique.
Overall all studies concluded that the test substance4-aminoazobenzene-3, 4’-disulphonic acid (Cas no.101-50-8)has a moderate sorption to soil.
[LogKoc: 2.9401]
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