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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.

The new ECHA CHEM database has been released by ECHA, and it now contains all REACH registration data. There are more details on the transition of ECHA's published data to ECHA CHEM here.

Diss Factsheets

Administrative data

Hazard for aquatic organisms

Freshwater

Hazard assessment conclusion:
PNEC aqua (freshwater)
PNEC value:
0.001 mg/L
Assessment factor:
1 000
Extrapolation method:
assessment factor
PNEC freshwater (intermittent releases):
0.015 mg/L

Marine water

Hazard assessment conclusion:
PNEC aqua (marine water)
PNEC value:
0 mg/L
Assessment factor:
10 000
Extrapolation method:
assessment factor

STP

Hazard assessment conclusion:
PNEC STP
PNEC value:
0.043 mg/L
Assessment factor:
10
Extrapolation method:
assessment factor

Sediment (freshwater)

Hazard assessment conclusion:
PNEC sediment (freshwater)
PNEC value:
22.451 mg/kg sediment dw
Extrapolation method:
equilibrium partitioning method

Sediment (marine water)

Hazard assessment conclusion:
PNEC sediment (marine water)
PNEC value:
22.451 mg/kg sediment dw
Extrapolation method:
equilibrium partitioning method

Hazard for air

Air

Hazard assessment conclusion:
no hazard identified

Hazard for terrestrial organisms

Soil

Hazard assessment conclusion:
PNEC soil
PNEC value:
10.466 mg/kg soil dw
Extrapolation method:
equilibrium partitioning method

Hazard for predators

Secondary poisoning

Hazard assessment conclusion:
no potential for bioaccumulation

Additional information

Classification is triggered based on available data, according to REGULATION (EC) No 1272/2008 OF THE EUROPEAN PARLIAMENT AND OF THE COUNCIL on classification, labelling and packaging of substances and mixtures, amending and repealing Directives 67/548/EEC and 1999/45/EC, and amending Regulation (EC) No 1907/2006.

Conclusion on classification

Classification of 4-(2,6,6-trimethylcyclohex-1-ene-1-yl)-but-3-ene-2-one for effects in the environment

Several major guideline – estimation values (Klimisch 2) are available for Methyl 2-naphthyl ether, indicates substantial toxic effect in all the 3 key trophic levels (fish, invertebrate and algae). Among the values lower values which lead to the classification of the substance the value which have been considered for further calculation (fish) is LC50 = 1.46 mg/L.

 

In determining the classification appropriate to 4-(2,6,6-trimethylcyclohex-1-ene-1-yl)-but-3-ene-2-one, it is necessary to consider all available evidence concerning its persistence, potential to accumulate and predicted or observed environmental fate and behaviour that may present a long-term and/or delayed danger to the structure and/or functioning of aquatic ecosystems. These points are considered below.

 

Persistence

Reliable studies are available to demonstrate that 4-(2,6,6-trimethylcyclohex-1-ene-1-yl)-but-3-ene-2-one is non persistent in nature and so is considered to have rapid biodegradation in the environment. In other words 4-(2,6,6-trimethylcyclohex-1-ene-1-yl)-but-3-ene-2-one degradation may therefore be expected to be fast. Thus it can be inferred that 4-(2,6,6-trimethylcyclohex-1-ene-1-yl)-but-3-ene-2-one is non persistent in character. 

 

4-(2,6,6-trimethylcyclohex-1-ene-1-yl)-but-3-ene-2-oneis non persistent and so do not satisfy the criteria for classification as persistent (P). 

 

Potential to accumulate

Predicted and measured log Kow values for 4-(2,6,6-trimethylcyclohex-1-ene-1-yl)-but-3-ene-2-one is less than 4 (Log Kow = 1.93). The potential for 4-(2,6,6-trimethylcyclohex-1-ene-1-yl)-but-3-ene-2-one to bioaccumulate in the tissues of organisms that inhabit aquatic or terrestrial matrices is negligible as the BCF factor for the substance is less than 1000.  

 

 The calculated BCF of 4-(2,6,6-trimethylcyclohex-1-ene-1-yl)-but-3-ene-2-oneis 90 dimensionless and below the threshold of 2000. 

 

4-(2,6,6-trimethylcyclohex-1-ene-1-yl)-but-3-ene-2-one does not satisfy the criterion for classification as bioaccumulative (B).

 

The toxicity values of fish, invertebrates and algae are LC50 = 1.46 mg/L, EC50 = 1.64 mg/L are EC50 = 2.92 mg/L, respectively. The toxicity values of all the trophic levels fall in the criteria for classification (CLP regulation) and so will qualify for classification as per the CLP regulation for level 2. 

So, 4-(2,6,6-trimethylcyclohex-1-ene-1-yl)-but-3-ene-2-one satisfies the environmental effects criterion for classification as toxic (T).

 

Thus it can be inferred that Methyl 2-naphthyl not P & B (including vPvB) substance, but will qualify as T.