Registration Dossier

Administrative data

Hazard for aquatic organisms

Freshwater

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

Marine water

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

STP

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

Sediment (freshwater)

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

Sediment (marine water)

Hazard assessment conclusion:
PNEC sediment (marine water)
PNEC value:
35.907 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:
16.16 mg/kg soil dw
Extrapolation method:
equilibrium partitioning method

Hazard for predators

Secondary poisoning

Hazard assessment conclusion:
no potential for bioaccumulation

Additional information

Classification for Aquatic toxicity is not 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 1-(6-methoxy-2-naphthyl)ethan-1-one for effects in the environment

Available data for the chemical 1-(6-methoxy-2-naphthyl)ethan-1-one, indicates toxic effect in all the three trophic levels namely fish, invertebrates and algae if one considers only the LC50 and EC50 values. However, it is important to note that the chemical is readily bio-degradable, has a BCF value of maximum 10 and the Log Kow value is also less than 4. Therefore, since all the conditions are not met as mentioned in the CLP regulation for classifiation in the aquatic environment, the chemical is not considered to be toxic to the aquatic environment.

Among the lower values used for the calculation of PNEC is a 96 hours LC50 value of 5.21 in fish.

 

In determining the classification appropriate to 1-(6-methoxy-2-naphthyl)ethan-1-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

Available information suggests that 1-(6-methoxy-2-naphthyl)ethan-1-one is non persistent in the water and soil environment. Though it is persistent in the sediment medium since there is no diffusion in this medium the long half life is not critical.  Thus it can be inferred that 1-(6-methoxy-2-naphthyl)ethan-1-one is non persistent in character. 

 

1-(6-methoxy-2-naphthyl)ethan-1-one is non persistent as it does not satisfy the criteria for classification as persistent (P). 

 

Potential to accumulate

Predicted and measured log Kow values for 1-(6-methoxy-2-naphthyl)ethan-1-one is less than 4 (Log Kow = 1.52). The potential for 1-(6-methoxy-2-naphthyl)ethan-1-one to bioaccumulate in the tissues of organisms that inhabit aquatic or terrestrial matrices is negligible as the BCF factor for the substance is 10 which is much below the threshold value of 2000.  

 

Thus, 1-(6-methoxy-2-naphthyl)ethan-1-one does not satisfy the criterion for classification as bioaccumulative (B).

 

The toxicity values of fish, invertebrates and algae are LC50 = 5.21 mg/L, EC50 = 15.76 mg/L are EC50 = 12.25 mg/L, respectively. 

Available data for the chemical 1-(6-methoxy-2-naphthyl)ethan-1-one, indicates toxic effect in all the three trophic levels namely fish, invertebrates and algae if one considers only the LC50 and EC50 values. However, it is important to note that the chemical is readily bio-degradable, has a BCF value of maximum 10 and the Log Kow value is also less than 4. Therefore, since all the conditions are not met as mentioned in the CLP regulation for classifiation in the aquatic environment, the chemical is not considered to be toxic to the aquatic environment.

So, 1-(6-methoxy-2-naphthyl)ethan-1-one does not satisfy the environmental effects criterion for classification as toxic (T).

 

Thus, based on all of the above, it can be inferred that 1-(6-methoxy-2-naphthyl)ethan-1-one is not a PBT chemical.