5-amino-2-methoxybenzenesulphonic acid

Endpoint summary

Description of key information

Short term toxicity to aquatic invertebrate:

Based on the average value of both models (Leadscope Enterprise model and SciMatics SciQSAR model), the result were predicted in Battery model. Based on the Danish (Q)SAR Database, the 48 hours EC50 was estimated to be 340.764 mg/l on Daphnia Magna for substance 5-amino-2-methoxybenzene-1-sulfonic acid with immobilization effects. Thus based on this value it can be concluded that the substance 5-amino-2-methoxybenzene-1-sulfonic acid cannot be classified as toxic as per the criteria of CLP regulation.

 

Toxicity to aquatic algae:

Based on the prediction done using the three different models i.e, Battery, Leadscope and SciQSAR used within Danish QSAR database, the short term toxicity on green algae was predicted for test substance 5-amino-2-methoxybenzene-1-sulfonic acid (CAS: 6470 -17 -3). The average EC50 value was given by the third model i.e, Battery model. On the basis of effects observed in a static freshwater system, the effect concentration EC50 value for the substance  5-amino-2-methoxybenzene-1-sulfonic acid is estimated to be 552.6504 mg/l for Pseudokirchneriella subcapitata during 72 hr exposure duration. Thus, on the basis of EC50 value, it can be concluded that the test chemical 5-amino-2-methoxybenzene-1-sulfonic acid can be considered as non-toxic to green algae at environmentally relevant concentrations and can be considered not-classified as per the CLP classification criteria.

 

Additional information

Summarized result for the toxicity of chemical 5-amino-2-methoxybenzene-1-sulfonic acid (CAS: 6470 -17-3) on the normal growth, activity and other behavioral changes of aquatic life includes aquatic invertebrates, algae and cyanobacteria. Following study includes predicted data for the target chemical and experimental data for the read across chemical which was selected on the basis of structure and functional similarity.

 

Short term toxicity to aquatic invertebrate:

Based on the various prediction data for the target chemical and experimental data for the read across chemical study have been reviewed to determine the toxic nature of 5-amino-2- methoxybenzene-1-sulfonic acid (CAS: 6470 -17 -3) on the growth and mobility of aquatic invertebrates. The studies are as mentioned below:

 

First predicted study used based on the average value of both models (Leadscope Enterprise model and SciMatics SciQSAR model), the result were predicted in Battery model. Based on the Danish (Q)SAR Database, the 48 hours EC50 was estimated to be 340.764 mg/l on Daphnia Magna for substance 5-amino-2-methoxybenzene-1-sulfonic acid with immobilization effects. Thus based on this value it can be concluded that the substance 5-amino-2-methoxybenzene-1-sulfonic acid cannot be classified as toxic as per the criteria of CLP regulation.

 

Similarly the first study was supported by the second predicted study for the target chemical used from the OECD QSAR toolbox version 3.3, 2017. Based on the prediction done using the OECD QSAR toolbox version 3.3 with log kow as the primary descriptor and considering the six closest read across substances, toxicity on daphnia magna was predicted for 5-amino-2- methoxybenzene-1-sulfonic acid (6470-17-3). Based on the intoxication of test organism the EC50 value was estimated to be 188.6853 mg/l when 5-amino-2-methoxybenzene-1-sulfonic acid exposed to daphnia magna for 48 hrs. Based on this value it can be concluded that the substance 5-amino-2-methoxybenzene-1-sulfonic acid is considered to be not toxic to aquatic environment as per the criteria mentioned in CLP regulation.   

 

Further study conducted on the read across (121-57-3) from Chemosphere, 1994 on the basis of structural similarity and read across chemical supports the classifications of target chemical. Toxicological profile for the sulfonic acids were study. Total 24hrs of exposure was provided to the daphnia magna. From the study the EC50 value for short term toxicity to aquatic invertebrates for Sulfanilic acid (121-57-3) in 24 hrs was determined to be 109.13 mg/l. Based on the result, Sulfanilic acid (121-57-3) was considered as not classified as per the CLP regulations.

 

Similarly fourth study increase the weight of evidence of study conducted for the read across chemical (98-40-8) from Chemosphere, 1994. Study was conducted to determine the toxic nature of chemical 2-(Ethylamino) toluene-4-sulphonic acid on the mobility of daphnia magna. The EC50 value for short term toxicity to aquatic invertebrates daphnia magna for 2-(Ethylamino)toluene- 4-sulphonic acid in 24 hrs and 48hrs was determined to be 170 mg/l and 154 mg/l. Based on the EC50 value, it can be concluded that the chemical 2-(Ethylamino) toluene-4-sulphonic acid was nontoxic and can be consider to be not classified as per the CLP classification criteria.

 

Based on the predicted data for the target chemical (OECD QSAR, Danish QSAR, 2017) and experimental studies for the read across chemical obtain from various sources (Chemosphere, 1994) toxicity on aquatic invertebrates was studied due to the exposure of 5-amino-2-methoxybenzene-1-sulfonic acid (CAS: 6470 -17 -3), and it was concluded that the substance 5-amino-2-methoxybenzene-1-sulfonic acid was consider as nontoxic and can be consider to be not classified as toxic to aquatic invertebrates as per CLP classification criteria.   

 

 

 

Toxicity to aquatic algae:

Based on the various prediction data for the target chemical and experimental data study have been reviewed to determine the toxic nature of 5-amino-2-methoxybenzene-1-sulfonic acid (CAS: 6470 -17 -3) on the growth of aquatic algae. The studies are as mentioned below:

 

First predicted study using based on the prediction done using the three different models i.e, Battery, Leadscope and SciQSAR used within Danish QSAR database, the short term toxicity on green algae was predicted for test substance 5-amino-2-methoxybenzene-1-sulfonic acid (CAS: 6470 -17 -3). The average EC50 value was given by the third model i.e, Battery model. On the basis of effects observed in a static freshwater system, the effect concentration EC50 value for the substance  5-amino-2-methoxybenzene-1-sulfonic acid is estimated to be 552.6504 mg/l for Pseudokirchneriella subcapitata during 72 hr exposure duration. Thus, on the basis of EC50 value, it can be concluded that the test chemical 5-amino-2-methoxybenzene-1-sulfonic acid can be considered as non-toxic to green algae at environmentally relevant concentrations and can be considered not-classified as per the CLP classification criteria.

 

In second predicted study for the target chemical 5-amino-2-methoxybenzene-1-sulfonic acid, used from the OECD QSAR toolbox 2017. Based on the prediction done using the OECD QSAR toolbox version 3.3 with log kow as the primary descriptor and considering the five closest read across substances, toxicity on Desmodesmus subspicatus (previous name: Scenedesmus subspicatus) predicted for 5-amino-2-methoxybenzene-1-sulfonic acid (6470-17-3). The EC50 value was estimated to be 223.435 mg/l when 5-amino-2-methoxybenzene-1-sulfonic acid (6470-17-3) exposed to Desmodesmus subspicatus for 72 hrs. Based on this value it can be concluded that the substance 5-amino-2- methoxybenzene-1-sulfonic acid (6470-17-3) is considered to not toxic to aquatic environment as per the criteria mentioned in CLP regulation.  

 

Experimental study for the read across chemical 4-amino-m-toluenesulfonic acid (98-33-9) from ABITEC report, 2017 was studied. Freshwater algal growth inhibition test was carried out on Desmodesmus subspicatus with the substance 4-amino-3- methylbenzenesulfonic acid according to OECD Guideline 201. The test substance was dissolved in OECD growth medium and tested at the concentrations 0, 0, 30, 45, 67, 100, 150 mg/L. Effects on the growth rate of the organism were studied. The median effective concentration (EC50) for the test substance 4-amino-3- methylbenzene- sulfonic acid, in Desmodesmus subspicatus was determined to be 110.6 mg/L. This value indicates that the substance is likely to be non-hazardous to aquatic algae and cannot be classified as per the CLP criteria.

 

Similarly in the fourth weight of evidence study for the structurally similar read across chemical 1,3-Phenylenediamine-4-sulfonic (88-63-1 ) from ABITEC lab report 2017. Freshwater algal growth inhibition test was carried out on Desmodesmus subspicatus with the substance 1,3-Phenylenediamine-4-sulfonic Acid according to OECD Guideline 201. The stock solution 150 mg/l was prepared by dissolving light brown powder in OECD growth medium. The solution was kept in ultrasonic bath for 20 min. Test solutions of required concentration were prepared by mixing the stock solution of the test sample with OECD growth medium and inoculum culture. Sample tested at the concentrations 0, 0, 30, 45, 67, 100 and 150 mg/L. Test performed by the static system for 72hrs of exposure period. Effects on the growth rate of the organism were studied. The median effective concentration (ErC50) for the test substance 1,3-Phenylenediamine-4-sulfonic Acid, in Desmodesmus subspicatus was determined to be 110 mg/L on the basis of effects on growth rate in a 72 hour study. This value indicates that the substance 1,3-Phenylenediamine-4-sulfonic Acid is likely to be non-hazardous to aquatic algae and cannot be classified as toxic as per the CLP classification criteria. 

 

Similarly in the fifth weight of evidence study for the structurally similar read across chemical (98-37-3) Water Research Pergamon Press, 1968. Short term toxicity to Chlorella pyrenoidosa (green algae) study was carried out for 72 hrs. Emerson strain of bacteria free, experimentally reproducible cultures of Chlorella pyrenoidosa was used as a test organism. The procedure involve the use of test tubes in both the screening and final tests. These test tubes contained 15 ml of inorganic culture medium, a predetermined amount of test chemical and 5 ml of algal culture. The tubes were incubated for 72 hrs and chlorophyll content of the algal suspensions was measured every 24 hrs. For chlorophyll measurement, the chlorophyll pigment was extracted with hot methanol in two separate extractions. An algal suspension, 2.5 ml, was removed from the test tube, centrifuged, washed with distilled water, and recentrifuged in preparation of chlorophyll analysis. After discarding the supernatant, the deposited cell material was coagulated by placing the cells in a boiling water bath for about 40 sec. About 2.5 ml of methanol were used in each extraction. Finally, the chlorophyll solution was diluted to a total volume of 10 ml with an acetone-water mixture (80 per cent by volume). A Beckman Spectrophotometer, Model DB, was used to measure the chlorophyll content according to MACKINv (1941) and ARNON (1949). For this a wavelength of 652 m/z was used because different proportions of chlorophyll a and b least affect the results at this wavelength. Control tubes containing no test chemical was also used in the experiment. Knop's solution, including the Hutner-EDTA microelement addition, was used as the culture medium. pH of culture medium was adjusted to 7.0 using KOH before use. The test organism was maintained under steady-state conditions, provided a chlorophyll content of 38 mg/l. Environmental control was rigidly maintained. The temp of water bath was 25 ± 1°C. The test apparatus consisted of a constant-temperature water bath, a light source containing four 200W fluorescent lamps with attached aluminum reflectors, a gas manifold to supply an air-CO2 mixture to each test tube, and a rack to hold the test tubes. A stream of 5 % CO2 in air gas mixture was supplied to culture medium in order to provide the inorganic carbon source and also to keep the algal ceils in suspension. Based on destruction of chlorophyll of test organism by test chemical Amino-1-phenol-4-sulfonic acid, the LOEC value was determine to be1500 mg/l and as no toxic effect at 1000 mg/l was observed, the NOEC value was determine to be 1000 mg/l. Thus, based on this value, it can be concluded that the substance can be considered as non-toxic to aquatic organisms and thus cannot be classified as hazardous as per the CLP criteria.

 

Based on the predicted data for the target chemical (OECD QSAR, Danish QSAR, 2017) and experimental studies for the read across chemical obtain from various sources (ABITEC report, 2016) toxicity on algae was studied due to the exposure of 5-amino-2-methoxybenzene-1-sulfonic acid (CAS: 6470 -17 -3), and it was concluded that the substance 5-amino-2-methoxybenzene- 1-sulfonic acid was consider as nontoxic and can be consider to be not classified as toxic to aquatic invertebrates as per CLP classification criteria.