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Environmental fate & pathways

Bioaccumulation: aquatic / sediment

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Description of key information

Alchisor CAL 145 comprises alkenes C13-14 hydroformylation products with read-across from the chemically-similar Alchisor CAL 123 as defined in the `Read-Across Justification Document'.  Where environmental toxicity data exist for Alchisor CAL 123, these are representative of the Alchisor CAL 145 substance. 
In accordance with REACH Annex IX, the requirement for a bioaccumulation study is waived on the basis of ready biodegradability, low toxicity to aquatic organisms and the absence of toxicity to mammals as it is considered unlikely to cause secondary poisoning in higher organisms. No reliable measured bioconcentration information is available for Alchisor CAL 145.

Key value for chemical safety assessment

Additional information

Alchisor CAL 145 comprises alkenes C13-14 hydroformylation products with read-across from the chemically-similar Alchisor CAL 123 as defined in the `Read-Across Justification Document'. Where environmental toxicity data exist for Alchisor CAL 123, these are representative of the Alchisor CAL 145 substance. The REACH requirement in Annex IX for a study on the bioaccumulation in aquatic species is not needed if the substance has a low potential for bioaccumulation and/or a low potential to cross biological membranes.

The log Kow of Alchisor CAL 145 (as read-across from Alchisor CAL 123) is presented as a range between 3.79 to >7.87 (with an average weighted mean value of 7.71), however it considered that secondary poisoning is unlikely to occur and the data requirement for CAL 145 is waived on the basis of ready biodegradability, low toxicity to aquatic organisms and the absence of toxicity to mammals. No reliable measured bioconcentration information is available for Alchisor CAL 145.

The log Kow of Alchisor CAL 145 is reported as a measured value of 7.7 at 25 °C and in accordance with REACH Annex IX, the requirement for a bioaccumulation study is not waived on the basis of log Kow as this is >3. Instead the data requirement for CAL 145 is waived on the basis of ready biodegradability, low toxicity to aquatic organisms and the absence of toxicity to mammals and it is considered unlikely to cause secondary poisoning in higher organisms. No reliable measured bioconcentration information is available for Alchisor CAL 145.

Biodegradation

The chemically-similar Alchisor CAL 123 has been shown in the reliable (Klimisch 1; Klimisch 2 when used for read-across) study by Schaefer and Matthews (2010) to be readily biodegradable in water. The test substance biodegraded to an extent of 87.7% after 28 days and although the biodegradation rate just missed the 10-day window threshold, this aspect of the test is not applicable to mixtures where different components of the mixture can biodegrade preferentially (reference TG 103C). It is assumed that Alchisor CAL 145 will readily biodegrade in the environment and be unavailable for uptake and bioaccumulation in biological organisms.

Toxicity to Aquatic Organisms

The toxicity of the chemically-similar Alchisor CAL 123 to aquatic organisms is very low based on the evidence presented in this dossier. The lowest measured toxicity was based on an algal test where the NOEL based on algal growth was 25 mg/L. Acute toxicity to invertebrates and fish was >100 mg/L based on 50% mortality. Using this evidence it is assumed that Alchisor CAL 145 represents a low hazard and is not considered to be toxic (in PBT terms) to aquatic life.

In summary, the data requirement for bioaccumulation in aquatic is waived on the evidence of ready biodegradability and the absence of toxicity in aquatic organisms and mammals.