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Environmental fate & pathways

Biodegradation in water and sediment: simulation tests

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Link to relevant study record(s)

Reference
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
other:
Transformation products:
no

Description of key information

Expert Judgement
Reaction mass of SIBX readily decomposes to carbon disulphide, especially in the presence of moisture/water. Therefore, the Biodegradation in water of carbon disulphide (CS2) need to be considered in the assessment of Reaction mass of SIBX.
Due to their structural similarity, it is expected that all xanthates would have similar Biodegradation effects either due to the xanthate or carbon disulphide.
On this basis, testing for Biodegradation in water for Reaction mass of SIBX is not applicable
Carbon disulphide (CAS number 75–15–0) it is the major decomposition product, which is liquid and have to be considered.
According to “ANNEX IX- STANDARD INFORMATION REQUIREMENTS FOR SUBSTANCES MANUFACTURED OR IMPORTED IN QUANTITIES OF 100 TONNES OR MORE”, a simulation testing on ultimate degradation in surface water, the study does not need to be performed if the substance is ready biodegradable. As Sodium isobutyl xanthate is ready biodegradable a ready biodegradability study does not need to be conducted.
Therefore testing for Biodegradation in water does not need to be performed.

Key value for chemical safety assessment

Additional information

Expert Judgement

Reaction mass of SIBX readily decomposes to carbon disulphide, especially in the presence of moisture/water. Therefore, the Biodegradation in water of carbon disulphide (CS2) need to be considered in the assessment of Reaction mass of SIBX.

Due to their structural similarity, it is expected that all xanthates would have similar Biodegradation effects either due to the xanthate or carbon disulphide.

On this basis, testing for Biodegradation in water for Reaction mass of SIBX is not applicable

Carbon disulphide (CAS number 75–15–0) it is the major decomposition product, which is liquid and have to be considered.

According to “ANNEX IX- STANDARD INFORMATION REQUIREMENTS FOR SUBSTANCES MANUFACTURED OR IMPORTED IN QUANTITIES OF 100 TONNES OR MORE”, a simulation testing on ultimate degradation in surface water, the study does not need to be performed if the substance is ready biodegradable. As Reaction mass of SIBX is ready biodegradable a ready biodegradability study does not need to be conducted.

Therefore testing for Biodegradation in water does not need to be performed.