Proxan-sodium

Biodegradation in water and sediment: simulation tests

Link to relevant study record(s)

Reference

Reference 1

Endpoint:

biodegradation in water: sediment simulation testing

Data waiving:

study scientifically not necessary / other information available

Justification for data waiving:

the study does not need to be conducted because the substance is readily biodegradable

Justification for type of information:

This class of substance is unstable under environmental and biological conditions and will readily hydrolyse to alcohols and sulphure dioxide / carbon dioxide with intermediary formation of carbon disulphide.  This is described in a number of reasearch papers and was confirmed though analysis of reaction products under synthetic gastric conditions. 

This is summarised in the attached report (which also serves to justify use of read-across data).

A number of biodegradationstudies have been performed on xanthates and the key degradation product carbon disulphide. Care is needed in the interpretation of the data as there will be a combination of biotic and abiotic processes.

Either way, there is clear evidence that the substance will not persist in the environment and will form metabolites that are themselves biodegradable or hydrolytically/photolytically unstable.

Reason / purpose for cross-reference:

data waiving: supporting information

Reference 2

Endpoint:

biodegradation in water: simulation testing on ultimate degradation in surface water

Data waiving:

study scientifically not necessary / other information available

Justification for data waiving:

the study does not need to be conducted because the substance is readily biodegradable

Justification for type of information:

This class of substance is unstable under environmental and biological conditions and will readily hydrolyse to alcohols and sulphure dioxide / carbon dioxide with intermediary formation of carbon disulphide.  This is described in a number of reasearch papers and was confirmed though analysis of reaction products under synthetic gastric conditions. 

This is summarised in the attached report (which also serves to justify use of read-across data).

A number of biodegradation studies have been performed on xanthates and the key degradation product carbon disulphide. Care is needed in the interpretation of the data as there will be a combination of biotic and abiotic processes.

Either way, there is clear evidence that the substance will not persist in the environment and will form metabolites that are themselves biodegradable or hydrolytically/photolytically unstable.

Reason / purpose for cross-reference:

data waiving: supporting information

Description of key information

This class of substance is unstable under environmental and biological conditions and will readily hydrolyse to alcohols and sulphure dioxide / carbon dioxide with intermediary formation of carbon disulphide.  This is described in a number of reasearch papers and was confirmed though analysis of reaction products under synthetic gastric conditions. 

This is summarised in the attached report (which also serves to justify use of read-across data).

A number of biodegradationstudies have been performed on xanthates and the key degradation product carbon disulphide. Care is needed in the interpretation of the data as there will be a combination of biotic and abiotic processes.

Either way, there is clear evidence that the substance will not persist in the environment and will form metabolites that are themselves biodegradable or hydrolytically/photolytically unstable.

Additional information

Solid xanthates decompose exposed to moisture in air, releasing carbon disulfide(CAS# 75-15-0), an alcohol and alkali hydroxide.

Hydrolysis is a significant factor in determining the environmental fate of xanthates.

In neutral or mildly alkaline water solution, sodium ethyl xanthate decomposes to ethyl alcohol, carbon disulfide, sodium carbonate and sodium trihiocarbonate.