REAKTIVE GELB F 97494

Endpoint summary

Additional information

Environmental Fate

It should be noted that the test substance is not considered as posing a hazard to the aquatic environment.

The test substance, Reactive Yellow F97-0494, is a solid under all environmental conditions and is highly soluble in water. It has a low volatility (based on a presumed low vapour pressure from the results of the physico-chemical data available) and a low affinity for soil / sediment value of log Koc -0.24. As such, any environmental release will result in virtually all of the substance compartmentalising into water compartments, with little release directly to atmosphere or compartmentalising to soil/sediment compartments.

Any potential exposure to the environment is predicted to result in rapid redistribution to water; due to its low volatility, high water solubility and partitioning values indicates that the majority of the substance would eventually partition to water rather than to soil and sediment should it be released to the environment. 

Reactive Yellow F97-0494 displays a low ready biodegradability in that it achieved 8% biodegradation in a 28-day manometric respirometry, indicating that it is unlikely to achieve a half-life of less than 40 or 60 days within fresh water attributed to ready biodegradation alone. However, it is expected to hydrolyse slowly under normal environmental conditions.  Experimental studies on hydrolytic effects demonstrated that the substance does undergo hydrolysis at environmentally relevant pH’s (pH 4: t½ = 23.5 days, pH 7: t½ = 33 days, pH 9: t½< 1 day at 25°C). As such, degradation is anticipated via this route. Studies on direct phototransformation in water are not available but it is assumed on the basis of chemical structure and nature of use that the substance is not degraded by direct photolysis. It is concluded, therefore, that abiotic processes would contribute significantly to the depletion of the substance within the environment. 

Reactive Yellow F97-0494 has a measured log Kow of < -4.9. This value indicates that possible bioaccumulation in the food chain is not anticipated. No direct information on bioaccumulation is available; however, the physico-chemical and environmental data for the substance indicate that bioaccumulation within body tissues is unlikely. Given the fact that the substance is subject to hydrolysis at biologically relevant pH’s, it is anticipated that bioaccumulation of the substance itself would not occur, as hydrolytic effects in association with metabolic effects would result in removal of the substance.

Adsorption to soil is deemed to be low, based on the very low partition coefficient value and high water solubility. Such a low potential indicates that the substance is unlikely to bind tightly to soils and sediments and instead partition almost exclusively to water. As such, significant exposure related effects to sediment and soil dwelling organisms are considered to be negligible.

Based on its high water solubility, low partition coefficient and fairly rapid hydrolysis rate at environmentally relevant pH’s, it can be concluded that it is unlikely that Reactive Yellow F97-0494 could potentially be persistent within the environment. Abiotic effects within the environment will result in eventual removal from the environment and hence significant contact with the organisms in the food chain can considered to be minimised. 

Finally, Reactive Yellow F97-0494 demonstrates low acute toxicity in mammalian studies therefore in the event of exposure to environmental organisms, effects due to secondary poisoning can be excluded.

Reliability:

The studies have all been ranked reliability 1 according to the Klimisch et al system. This ranking was deemed appropriate because the studies were all conducted to GLP in compliance with recognised guidelines.

Justification for classification or non classification

The above results triggered no classification under the CLP Regulation (EC No 1272/2008).