1,2,3,5,6,7-hexahydro-1,1,2,3,3-pentamethyl-4H-inden-4-one

Endpoint summary

Description of key information

Abiotic degradation:

Air: Based on estimation with the QSAR model Aopwin, the substance undergoes in air rapid degradation after reaction with hydroxyl radicals or ozone. The DT50 values after reaction with hydroxyl radicals and ozone are 1.2 hours and 24 hours respectively. The half-life is < 2 days. The substance will not reach the stratosphere and is therefore not considered to be a long-range transported chemical in air (http://www.unece.org/fileadmin/DAM/env/documents/2000/ece/eb/ece%20eb%20air.60.e.pdf). The substance does not have an ozone depletion potential because it does not contain halogens and does not have the potential to reach the stratosphere in accordance with EU CLP (EC no 1272/2008 and its amendments).

Water: The substance is hydrolytically stable. It does not contain hydrolysable groups in its chemical structure such as esters, carbamates, epoxides, halomethanes, acylhalides (see Hydrowin, EpiSuite for all hydrolysable groups). The half-life at 20°C is therefore expected to be > 1 year.

Biotic degradation:

In a screening study according to OECD TG 301C no biodegradation was found after 28 days. This study shows that the substance is not readily biodegradable under the conditions of this test.

Bioaccumulation:

The highest BCF (steady state) in fish was found to be 140 L/kg ww, corresponding to 157 L/kg ww when converted to a standard fish lipid content of 5%. Based on this BCF no bioaccumulation is expected (BCF < 500). The BCF in earthworms was estimated with the equation from Jager (1998) to be 191 l/kg ww, indicating that the potential for bioaccumulation in terrestrial organisms will also be low.

Transport and distribution:

The substance is a moderately lipophilic substance with log Kow 4.2. The sorption to organic matter Koc is 200.This indicates that the substance will have a low potential to adsorb to sediment/soil. 

To assess the volatilisation potential of the substance a Henry's law constant was calculated which gave a result of 3.92 Pa.m3/mol at 25°C and 1.88 Pa.m3/mol at 12°C. From the distribution modelling results it can be concluded that volatilisation is of minor importance in the environmental behaviour of Cashmeran.

Based on Level III distribution modelling using EPISUITE (assuming equal and continuous releases to air, water and soil) using the CAS number 33704 -61 -9 and the measured physico-chemical parameters as input, it is estimated that the majority of the substance released to the environment will partition mainly into soil (85%) and water (14%) with small amounts to sediment and air (both <1%).

The SimpleTreat model, which is incorporated in EUSES, simulated the distribution of the substance in a Sewage Treatment Plant based on vapour pressure, water solubility, log Kow and biodegradability. The model predicts that 92.3% of the substance will partition to water, 1.76% to sewage sludge (primary settler) and 5.2% to air.