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 aluminum tris(4-{[3-carboxy-5-oxo-1-(4-sulfophenyl)-4,5-dihydro-1H-pyrazol-4-yl]diazenyl}benzenesulfonate) (CAS No. 12225-21-7) was determined by the Reverse Phase High Performance Liquid Chromatographic method. The reference substances were chosen according to estimated Koc range of the test substance and generalized calibration graph was prepared. The reference substances were 2-nitrophenol, nitrobenzene, 4-nitrobenzamide, N, N-dimethylbenzamide, Nmethylbenzamide and benzamide were chosen having Koc value ranging from 1.239 to 2.4.

The Log Koc value of test chemical aluminum tris(4-{[3-carboxy-5-oxo-1-(4-sulfophenyl)-4,5-dihydro-1H-pyrazol-4-yl]diazenyl}benzenesulfonate) was determined to be 0.7040 dimensionless at 25°C. Based on the value of log Koc it is concluded that this test chemical has negligible sorption to soil and sediments and therefore has rapid migration potential to ground water.

Additional information

Adsorption/desorption:

Experimental studies for target chemical aluminum tris(4-{[3-carboxy-5-oxo-1-(4-sulfophenyl)-4,5-dihydro-1H-pyrazol-4-yl]diazenyl}benzenesulfonate) (CAS No. 12225-21-7) and for its parent compound as read across chemical are summarized below for adsorption endpoint.

 

 In a key study the adsorption coefficient Koc in soil and in sewage sludge for target chemical aluminum tris(4-{[3-carboxy-5-oxo-1-(4-sulfophenyl)-4,5-dihydro-1H-pyrazol-4-yl]diazenyl}benzenesulfonate) (CAS No. 12225-21-7) was determined by the Reverse Phase High Performance Liquid Chromatographic method. The reference substances were chosen according to estimated Koc range of the test substance and generalized calibration graph was prepared. The reference substances were 2-nitrophenol, nitrobenzene, 4-nitrobenzamide, N, N-dimethylbenzamide, Nmethylbenzamide and benzamide were chosen having Koc value ranging from 1.239 to 2.4.

The Log Koc value of test chemical aluminum tris (4-{[3-carboxy-5-oxo-1-(4-sulfophenyl)-4,5-dihydro-1H-pyrazol-4-yl]diazenyl}benzenesulfonate) was determined to be 0.7040 dimensionless at 25°C. Based on the value of log Koc it is concluded that this test chemical has negligible sorption to soil and sediments and therefore has rapid migration potential to ground water.

 

Next study was supporting study done from U.P.B. Science Bulletin (Series B, Vol. 78, Iss. 1, 2016 P.137-148 ) in this study the Soil adsorption test was conducted for read across chemical tartrazine by using sorption floatation method. Initial concentration of read across 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 determined to be 9% using soil as adsorbent in sorption floatation technique.

 

Last study was also supporting study done from Afinidad 66, no. 544 (2009) for read across chemical in this studytThe capacity of a Romanian soil to retain Acid Yellow 23 from aqueous solution by sorption has been investigated.

The experiments were performed by using a natural soil sampled from the depth of 0-15 cm in the industrial area of the city of Iasi during the summer time (July 2008) that was previously dried and further screened to achieve soil particles size of above 2 mm, equilibration being carried-out with solution of CaCl2. For the equilibrium study, 50 ml Acid Yellow 23 of different concentrations were mixed with a dose of 12 g/L soil, the mixture being subjected to stirring at the room temperature as long it was needed to reach the equilibrium. The Freundlich, Langmuir and linear isotherm models were applied to describe the process and the parameters of these equations were calculated.

The sorption equilibrium revealed that the soil with particles higher than 2 mm may uptake 0.25 mg/g.

The sorption process is best represented by the Langmuir isotherm. The results reveal that the sorption of Acid Yellow 23 onto particles of soils follows a pseudo second order kinetics, suggesting that the chemisorption is the rate controlling mechanism.

The organic carbon normalized sorption coefficient KOC = 151.46 L/Kg. The very low value of KOC shows that the dye tend to remain in solution indicating also its very high mobility, since it is considered that sorption coefficients less than 500 indicate a considerable potential for losses through leaching. The low value of the organic carbon normalized sorption coefficient KOC suggests a high potential of leaching that could result in contamination of the groundwater.

 

 By considering key study mentioned avove it is concluded that test chemical aluminum tris(4-{[3-carboxy-5-oxo-1-(4-sulfophenyl)-4,5-dihydro-1H-pyrazol-4-yl]diazenyl}benzenesulfonate) (CAS No. 12225-21-7) negligible sorption to soil and sediments and therefore has rapid migration potential to ground water and other both the studies corroborate this result.