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EC number: 220-293-0 | CAS number: 2706-28-7
Endpoint summary
Administrative data
Description of key information
Additional information
Biodegradation in water
Various data for the test compoundC.I. Acid Yellow 9(CAS No. 2706-28-7)and the study for its read across substance were reviewed for the biodegradation end point which are summarized as below:
Estimation Programs Interface Suite (EPI suite, 2016) was run to predict the biodegradation potential of the test compound C.I. Acid Yellow 9 (CAS no. 2706 -28 -7). The screening tests ready biodegradability of the test substance was calculated using the software BIOWIN v4.10. The results indicatethat C.I. Acid Yellow 9 is not expected to be readily biodegradable in nature.
Degradation of Disodium 2-amino-5-[(4-sulphonatophenyl)azo]benzenesulphonate was performed for 28 days according to the OECD TG 302 B guideline (GSBL database, 2016). Concentration of inoculum i.e, activated sludge used was 0.2 g/l. No degradation of test substance was determined by DOC removal parameter in 28 days. Thus, the substance Disodium 2-amino-5-[(4-sulphonatophenyl)azo]benzenesulphonate is not expected to be readily biodegradable in nature.
Biodegradation study was carried out (U. Pagga and O. Brown, 1986) for 42 days for evaluating the percentage biodegradation of the test chemical C. I. Acid Yellow 36using modified OECD Guideline 302B.Activated sludge was used as an inoculum. The sources of the activated sludge were treatment plants conveniently located to the laboratories carrying out the test. These treatment plants received communal and/or industrial wastewater. Concentration of inoculum i.e, activated sludge used was 0.5 g/l and initial test substance conc. used in the study was 100 mg/l. Analytical methods involve the measurement of extinction at absorption maximum 412 nm and DOC (dissolved organic carbon).The percentage degradation of test substance was found to be 11% by DOC removal. Based on the limit values for classification of Static Test – the test chemical was classified in CATEGORY ‘D’. Thus, the substance C. I. Acid Yellow 36 is not expected to be not readily biodegradable in water.
Biodegradation study was conducted (GREIM H, et.al; 1994) for 28 days for evaluating the percentage biodegradability of test substance Amsonic acid disodium salt. The study was performed according toOECD Guideline 302 B (Inherent biodegradability: Zahn-Wellens/EMPA Test). The percentage degradation of test substance was determined to be < 10% in 28 days. Thus, the substance Amsonic acid disodium salt is not expected to be readily biodegradable in water.
Biodegradation study was conducted (EnviChem, 2014) for 14 days for evaluating the percentage biodegradability of test substance Benzenesulfonic acid, 2,2'-(1,2-ethenediyl)bis[5-amino-, sodium salt. Concentration of inoculum i.e, sludge used was 30 mg/l and initial test substance conc. used in the study was 100 mg/l. No degradation of test substance was found by BOD in 14 days. Thus, the substance Benzenesulfonic acid, 2,2'-(1,2-ethenediyl)bis[5-amino-, sodium salt is not expected to be readily biodegradable in water.
On the basis of above results for target and read across substance, it can be concluded that the test substanceC.I. Acid Yellow 9can be expected to be not readily biodegradable in nature.
Biodegradation in water and sediment
Estimation Programs Interface (EPI) Suite (2016) prediction model was run to predict the half-life in water and sediment for the test compound C.I. Acid Yellow 9 (CAS No. 2706 -28 -7). Half-life of C.I. Acid Yellow 9 in water is estimated to be 37.5 days (900 hrs) while in sediment it is 337.5 days (8100 hrs). Based on these half-life value of C.I. Acid Yellow 9, it is concluded that the chemical is not persistent in water and persistent in sediment.
Biodegradation in soil
Based on EPI prediction Level III Fugacity Model (EPI suite, 2016), the estimated half-life period of C.I. Acid Yellow 9 (CAS No. 2706 -28 -7) in soil was obtained to be 75 days (1800 hrs). Based on this half-life value of C.I. Acid Yellow 9, it is concluded that the chemical is not persistent in the soil environment.
On the basis of available information, the test substanceC.I. Acid Yellow 9can be considered to be not readilybiodegradable in nature.
Adsorption / desorption:
The Soil Adsorption Coefficient i.e Koc value of Disodium 2-amino-5-[(4-sulphonatophenyl)azo]benzenesulphonate (Synonym of C.I. Acid Yellow 9) was estimated using EPI suite KOCWIN Program (v2.00) program as Koc 871.3 L/kg(log Koc=2.940) by means of MCI method at 25 deg.C. This Koc value indicates that the substance Disodium 2-amino-5-[(4-sulphonatophenyl)azo]benzenesulphonate (Synonym of C.I. Acid Yellow 9) has moderate sorption to soil and sediment and therefore have slow migration potential to groundwater.
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