[No public or meaningful name is available]

Toxicity to aquatic algae and cyanobacteria

Link to relevant study record(s)

Reference

Endpoint:

toxicity to aquatic algae and cyanobacteria

Type of information:

other: Expert assessment

Adequacy of study:

key study

Study period:

July 2022

Reliability:

2 (reliable with restrictions)

Rationale for reliability incl. deficiencies:

other: Expert assessment performed using a weight of evidence approach

Principles of method if other than guideline:

Expert assessment - no guideline followed

GLP compliance:

no

Key result

Remarks on result:

other: An expert assessment has been performed using a weight of evidence approach for the dissolved fraction of the substance.

Conclusions:

Based on the available data on the major constituents of the amorphous carbon and silicon dioxide recovered from two-stage pyrolysis of spent tyres (EC 954-402-4), it can be concluded that the dissolved fraction of the substance will not be classified as hazardous to aquatic algae and cyanobacteria.

However, additional testing is rendered necessary to assess the particulate toxicity of the nanomaterial. Long-term toxicity testing with green algae is recommended for the particulate substance to account for mechanical effects in aquatic algae and the potential for bioaccumulation.

Executive summary:

An expert assessment has been performed in which an argument has been made to replace aquatic short-term testing with a weight of evidence approach for the dissolved fraction of the substance. This approach discusses the acute aquatic toxicity potential of the substance based on data collected from the ECHA registration dossiers of all major constituents. Furthermore, an additional assessment for particle toxicity has been proposed and discussed.

Based on the available data on the major constituents of the amorphous carbon and silicon dioxide recovered from two-stage pyrolysis of spent tyres (EC 954-402-4), it can be concluded that the dissolved fraction of the substance will not be classified as hazardous to aquatic algae and cyanobacteria.

However, additional testing is rendered necessary to assess the particulate toxicity of the nanomaterial. Long-term toxicity testing with green algae is recommended for the particulate substance to account for mechanical effects in aquatic algae and the potential for bioaccumulation.

 

Description of key information

An expert assessment has been prepared using a weight of evidence approach. Based on the available data on the major constituents of the amorphous carbon and silicon dioxide recovered from two-stage pyrolysis of spent tyres (EC 954-402-4), it can be concluded that the dissolved fraction of the substance will not be classified as hazardous to aquatic algae and cyanobacteria.

However, additional testing is rendered necessary to assess the particulate toxicity of the nanomaterial. Long-term toxicity testing with green algae is recommended for the particulate substance to account for mechanical effects in aquatic algae and the potential for bioaccumulation.