Aluminium, 3-hydroxy-4-[(4-sulfo-1-naphthalenyl)azo]-2,7-naphthalenedisulfonic acid complex

Endpoint summary

Description of key information

Adsorption/desorption:

The Soil Adsorption Coefficient i.e. Koc value of test chemical Aluminium, 3-hydroxy-4-[(4-sulfo-1-naphthalenyl)azo]-2,7-naphthalenedisulfonic acid complex (CAS No. 12227-62-2)) was estimated using EPI suite KOCWIN Program (v2.00) as 1260000 L/kg (log Koc= 6.1003) by means of MCI method at 25 deg. C.  This log Koc value indicates that test chemical Aluminium, 3-hydroxy-4-[(4-sulfo-1-naphthalenyl)azo]-2,7-naphthalenedisulfonic acid complex has very strong sorption to soil and therefore test chemical has negligible migration potential to ground water.

Additional information

Adsorption/desorption:

Predicted data study for target chemical Aluminium, 3-hydroxy-4-[(4-sulfo-1-naphthalenyl)azo]-2,7-naphthalenedisulfonic acid complex (CAS No. 12227-62-2) and supporting experimental study for its structurally similar read cross chemical have been conducted for adsorption endpoint and their results are summarized below.

 

In predicted data study the Soil Adsorption Coefficient i.e. Koc value of test chemical Aluminium, 3-hydroxy-4-[(4-sulfo-1-naphthalenyl)azo]-2,7-naphthalenedisulfonic acid complex (CAS No. 12227-62-2) was estimated using Estimation Program Interface (EPI suite, 2017) KOCWIN Program (v2.00) as 1260000 L/kg (log Koc= 6.1003) by means of MCI method at 25 deg. C.  This log Koc value indicates that test chemical Aluminium, 3-hydroxy-4-[(4-sulfo-1-naphthalenyl)azo]-2,7-naphthalenedisulfonic acid complex has very strong sorption to soil and therefore test chemical has negligible migration potential to ground water.

 

Another study was experimental study for read across chemical trisodium (4E)-3-oxo-4-[2-(4-sulfonatonaphthalen-1-yl)hydrazin-1-ylidene]-3,4-dihydronaphthalene-2,7-disulfonate (CAS no. 915 -67 -3) Amaranth dye from Research Journal of Chemical Sciences, by Nanganoa L.T, Ketcha J.M. and Ndi J.N. (2014) in this study the capability of smectite clay (Sa01) was investigated as a low cost adsorbent for the adsorption of a hazardous water soluble dye amaranth from aqueous solutions.

The clay material obtained from Sabga in the North West region of Cameroon (Sa01).Sa01 was air dried, ground into fine powder using a mortar and was then passed through an 80 μm mesh opening size sieve. The sieved powder was kept in an oven at 110°C for 24 hours, removed and cooled in a dessicator before use.

The experiments were conducted with artificial wastewater solution prepared by dissolving amaranth dye in distilled water. A 1000 mg/L stock solution of amaranth was prepared. By dilution with distilled water, standard solutions were also prepared. The concentrations of these solutions were measured with a UV spectrophotometer at a wavelength of maximum absorption of 520 nm. A calibration curve of absorbance versus concentration of the dye was plotted. The pH of the solutions was adjusted with either 0.1 M HCl or 0.1 M NaOH.

Batch mode adsorption studies were performed at ambient temperature of 25°C. Solutions containing known concentrations of adsorbate and accurately weighed amounts of adsorbent were introduced in 250 ml capacity flasks, sealed and agitated with a magnetic stirrer at given time intervals.

Two types of isotherm models were investigated; the Langmuir and Freundlich Isotherms.

83.6% of dye was adsorbed at pH 2, adsorbent mass of 1.0 g and initial dye concentration of 30 mg/L.

kf =0.281, kl = 0.0822

kf = freundlich adsorption isotherm constant

kl = Langmuir adsorption isotherm constant

The Freundlich adsorption isotherm was observed to correlate better the experimental data with R2 = 0.9894.

 

On the basis of both the studies mentioned above it can be concluded that test chemical test chemical Aluminium, 3-hydroxy-4-[(4-sulfo-1-naphthalenyl)azo]-2,7-naphthalenedisulfonic acid complex has very strong sorption to soil and therefore test chemical has negligible migration potential to ground water.