Hydrocarbons, C11-C16, n-alkanes, isoalkanes,

Endpoint summary

Description of key information

Phototransformation in air

 

The available weight of evidence demonstrates that this substance does not absorb light within a range of 290 to 750 nm, the range in which photolysis occurs. Therefore, direct photolysis will not contribute to the degradation of this substance in the air. Further testing is not required under Annex XI, section 1.2.

 

Hydrolysis

 

Hydrolysis is a reaction in which a water molecule or hydroxide ion substitutes for another atom or group of atoms present in a chemical resulting in a structural change of that chemical. Potentially hydrolysable groups include alkyl halides, amides, carbamates, carboxylic acid esters and lactones, epoxides, phosphate esters, and sulfonic acid esters (Neely, 1985). The lack of a suitable leaving group renders compounds resistant to hydrolysis.

The chemical constituents that comprise the substance consist entirely of carbon and hydrogen and do not contain hydrolysable groups. As such, they have a very low potential to hydrolyze. Therefore, this degradative process will not contribute to their removal from the environment.

 

Phototransformation in water

 

The available weight of evidence demonstrates that this substance does not absorb light within a range of 290 to 750 nm, the range in which photolysis occurs. Therefore, direct photolysis will not contribute to the degradation of this substance in the aquatic environment. Further testing is not required under Annex XI, section 1.2.

 

Phototransformation in soil

 

The available weight of evidence demonstrates that this substance does not absorb light within a range of 290 to 750 nm, the range in which photolysis occurs. Therefore, direct photolysis will not contribute to the degradation of this substance in the terrestrial environment. Further testing is not required under Annex XI, section 1.2.

 

Biodegradation in water: screening tests

There is no data available for this substance.However, key data is available for structural analogues, Hydrocarbons, C10-C13, n-alkanes, isoalkanes, <2% aromatics; Hydrocarbons, C12-C15, n-alkanes, isoalkanes, <2% aromatics; Hydrocarbons, C14-C16, n-alkanes, isoalkanes, <2% aromatics; and Hydrocarbons C15-C19, n-alkanes, isoalkanes, <2% aromatics and presented in the dossier. The hypothesis for the analogue approach is that the test substances, contain constituents which are also constituents of the target substance, Hydrocarbons, C11-C16, n-alkanes, isoalkanes, <2% aromatics. The substances have overlapping constituents and therefore have qualitatively similar properties (RAAF Scenario 2 applies).

 

Biodegradation in water: simulation tests

 

There is no data available for this substance. However, key data is available for structural analogues. The data is read across to this substance based on analogue read across and a discussion and report on the read across strategy is provided as an attachment in IUCLID Section 13.

 

Biodegradation in sediment: simulation tests

 

This substance is considered readily biodegradable. Therefore, in accordance with REACH Annex IX column 2 exemption, the simulation testing in sediment does not need to be conducted.

 

Biodegradation in soil

 

This substance is considered to be readily biodegradable. Therefore, in accordance with REACH Annex IX column 2 exemption,simulation testing on ultimate degradation in soil does not need to be conducted. However, data is available from a Guideline (OECD 304 A) study conducted on Hydrocarbons, C11-C14, n-alkanes, isoalkanes, cyclics, <2% aromatics.

 

Bioaccumulation: aquatic/sediment

 

Standard Bioaccumulation studies for this endpoint are intended for monoconstituent substances and are not appropriate for petroleum UVCB substances. In accordance with Annex XI Section 1.3 the endpoint has been fulfilled using QSAR calculations for representative hydrocarbon structures that comprise the hydrocarbon blocks used to assess the environmental risk of this substance with the PETRORISK model (see the representative structures from the PETRORISK Product Library in the spreadsheet attached in IUCLID section 13.2). As such, testing is not scientifically necessary

 

Adsorption / desorption

 

Standard adsorption studies for this endpoint are intended for monoconstituent substances and are not appropriate for petroleum UVCB substances. In accordance with Annex XI Section 1.3 the endpoint has been fulfilled using QSAR calculations for representative hydrocarbon structures that comprise the hydrocarbon blocks used to assess the environmental risk of this substance with the PETRORISK model (see the representative structures from the PETRORISK Product Library in the spreadsheet attached in IUCLID section 13.2). As such, testing is not scientifically necessary.

 

Henry's Law Constant

 

Standard Henry's Law Constant studies for this endpoint are intended for monoconstituent substances and are not appropriate for petroleum UVCB substances. In accordance with Annex XI Section 1.3 the endpoint has been fulfilled using QSAR calculations for representative hydrocarbon structures that comprise the hydrocarbon blocks used to assess the environmental risk of this substance with the PETRORISK model (see the representative structures from the PETRORISK Product Library in the spreadsheet attached in IUCLID section 13.2). As such, testing is not scientifically necessary.

 

Distribution modelling

 

The distribution of Hydrocarbons, C11-C16, n-alkanes, isoalkanes, <2% aromatics in the environmental compartments air, water, soil, and sediment, has been calculated using the PETRORISK Model, version 7.04. Computer modelling is an accepted method for estimating the environmental distribution of chemicals. Based on the regional scale exposure assessment, the multimedia distribution of Hydrocarbons, C11-C16, n-alkanes, isoalkanes, < 2% aromatics is 11% to air, 3.2% to water, 11% to soil and 74.8% to sediment. Distribution modelling results are included in the 'Multimedia distribution modelling results' tab in the 2016 PETRORISK spreadsheet attached in the Robust Study Summary (RSS).