Registration Dossier

Environmental fate & pathways

Endpoint summary

Administrative data

Description of key information

Additional information

Stability

 

Hydrolysis

Tests need not be conducted, as Reaction product of adipic acid and sebacaic acid and isotridecan-1 -ol is highly insoluble in water (see Sect. 4.8) (Annex VIII, Nr 9.2.2.1.)

In addition using the calculation program US EPA EPI Suite v4.00, the half-life of the component diisotridecyl adipate at 25°C and under neutral conditions was estimation to be 4.6 years.

 

Biodegradation

Biodegradation in water: screening tests

The test substance Reaction product of adipic acid and sebacic acid and isotridecan-1 -ol was demonstrated to be readily biodegradable in an OECD 301B-test. Additionally the component diisotridecyl adipate is readily biodegradable. In Episuite calculations is predicted that the components diisotridecyl adipate and diisotridecyl sebacate are readily biodegradable. This result is supported by the OECD 301B-study of the read-across substance diisotridecyl dodecandioate. Also the analogue is readily biodegradable.

 

Biodegradation in water and sediment: simulation tests

In accordance with column 2 of REACH Annex IX Nr 9.2.1.2, the study does not need to be conducted as the substance is regarded as readily biodegradable and to be highly insoluble in water (see Sect. 4.8).

 

Biodegradation in soil

In accordance with column 2 of REACH Annex IX Nr 9.2.1.2, the study does not need to be conducted as the substance is regarded as readily biodegradable.

Bioaccumulation

 

Bioaccumulation: aquatic/sediment

Diisotridecyl adipate: The log BCF of diisotridecyl adipate (log Pow = 13.03) was estimated to be 1.17 (BCF 14.8) using the program US EPA EPI Suite v4.00. In addition, a log BAF (upper trophic) of -0.008 (BAF = 0.982) was calculated using the method of Arnot-Gobas.

Diisotridecyl sebacate: The BCF was calculated 3.162 L/kg ww (log BCF = 0.5). In addition, a BAF was estimated to 0.935 (log BAF -0.029 - upper trophic).The low BCF/BAF values indicate a low potential of diisotridecyl adipate and diisotridecyl sebacate for bioaccumulation in aquatic organisms and therefore for the test substance Reaction product of adipic acid and sebacic acid and isotridecan-1-ol. The BCF of 14.83 is something like worst case for the components.

 

Transport and Distribution

 

Adsorption/Desorption

Based on a calculated log Koc of 7.08 (MCI method) or 8.00 (log Kow method) of the component diisotridecyl adipate is expected to have a high potential for accumulation in soil and sediment (MWC, 2010).

Based on a calculated log Koc of 8.055 (MCI method) or 9.002 (log Kow method) of the component diisotridecyl sebacate is expected to have a high potential for accumulation in soil and sediment (Sasol, 2013). Therefore also the Reaction product of adipic acid and sebacic acid and isotridecan-1 -ol has a high potential for accumulation in soil and sediment.

 

 

Henry's Law constant

The Henry's law constant (HLC) of the component diisotridecyl adipate at 25°C was estimated by calculation methods (program US EPA EPI Suite v4.00) (MWC 2010).

Bond contribution method: HLC (25°C) = 8.89 Pa*m3/mol

Group contribution method: HLC (25°C) = 6.83 Pa*m3/mol

Diisotridecyl adipate will volatilize from water.

 

Distribution modelling

Estimates obtained from Level III fugacity distribution modeling using US EPA EPI Suite v4.00, indicate that emissions of the component diisotridecyl adipate will distribute mostly in soil (84.9%) and to a lesser extend in water (14.8%). The fractions in air (0.28%) and in sediment (0.02%) are minimal. The estimated persistence time is 1310 hr (ca. 55 days) (MWC 2010).

 

Other distribution data

Volatilization from Water

Using the calculated Henry's Law Constant (HLC) of 8.89 Pa*m³/mol at 25 °C, the component diisotridecyl adipate volatilization half-lifes from a model river and a model lake were estimated to 4.3 and 236 hours (ca. 0.2 and 10 days), respectively (MWC 2010).