1-(6-methoxy-2-naphthyl)ethan-1-one

Endpoint summary

Additional information

Stability:

Phototransformation in air:

The atmospheric oxidation half life of 1-(6-methoxy-2-naphthyl)ethan-1-on was estimated using level III multimedia model it indicates that 1-(6-methoxy-2-naphthyl)ethan-1-on is not persistent in air medium as the half life period of 1-(6-methoxy-2-naphthyl)ethan-1-on in air is only 0.38 days. From this it is concluded that 1-(6-methoxy-2-naphthyl)ethan-1-on is rapidly phototransformed in air.

 

Medium	Halflife	percent in medium
Air	0.38	0

Hydrolysis :

The hydrolysis rate constant of 1-(6-methoxy-2-naphthyl)ethan-1-one was estimated to be 0.0000000000422862 (42.2862 E-12) cm3/molecule-sec. at half life of the 3.035 Hrs.This estimated half life of the substance indicates that the substance is moderately hydrolysable.

Biodegradation:

Biodegradation in Water: Screening test:

Half life period of 1-(6-methoxy-2-naphthyl)ethan-1-on in water was estimated to be 38 days indicating that 1-(6-methoxy-2-naphthyl)ethan-1-on is readily biodegradable in water since the half life is less than the threshold of 40 days (to qualify the chemical as persistent)

Media	Half-Life  (days)	Percent in Medium
Water	38	17 %

Biodegradation in Water and Sediment:

Half life period of 1-(6-methoxy-2-naphthyl)ethan-1-on in water was observed to be 38 days while in sediment it is 340 days. Based on these half life values it is concluded that 1-(6-methoxy-2-naphthyl)ethan-1-on is readily biodegradable in water but not readily biodegradable in sediment. However, since there is no diffusion of the substance in the sediment as evident from the reported data (0% in sediment) and hence persistence in the sediment compartment is not likely to be critical.

Supporting study also indicates the half life in water to be900 hrs (37.5 days) while in sediment it is 8100 hrs (337.5 days).

Media	Half-Life  (days)	Percent in Each Medium
Water	38	17 %
Sediment	340	0 %

Media	Half life (hrs)	% in medium	Emissions (%) (hr) (kg/hr)
Water	900	19.6	1000
Sediment	8100	0.386	0

Biodegradation in Soil:

Half life period of 1-(6-methoxy-2-naphthyl)ethan-1-on in Soil was observed to be 1800 hrs (75 days) which does not exceeds the threshold criteria 120 days. Based on these half life values it is concluded that 1-(6-methoxy-2-naphthyl)ethan-1-on is readily biodegradable (not persistent) in Soil.

Media	Half life (Days)	% in medium
Soil	75	83

 

Media	Half life (hrs)	% in medium	Emissions  (kg/hr)
Soil	1800	79.7	1000

 

Bioaccumulation:

Bioaccumulation: aquatic / sediment:

No. of studies reviewed for bioaccumulation in aquatic/ sediment and presented as weight of evidence; from reliable sources having Klimish rating 2 to 4

The summary of the results are presented below

Sr.no	Endpoint name	value	unit	source
1	BCF	10	-	PBT profiler
2	BCF	10.36	L/Kg wet wt	EPI suit
3	BCF	5.248	-	DEPA

 

From this it is concluded that the substance 1-(6-methoxy-2-naphthyl)ethan-1-onis not expected to bioaccumulate in the food chain as it does not exceed thethreshold of 2000.

 

Transport and distribution:

Adsorption / desorption:

Soil adsorption coefficient (Koc) value of 1-(6-methoxy-2-naphthyl) ethan-1-one was estimated to be 351.9 L/kg (Log Koc = 2.5464) at 25 deg C by means of MCI method. This indicates that 1-(6-methoxy-2-naphthyl) ethan-1-one will adsorb to the organic carbon fraction of the soil and will have moderate tendency to move with the water content in the soil medium. This value at 20 deg C is equivalent to 281.52 (Log Koc = 2.4495)

Henry's Law Constant:

Henry’s Law constant of 1-(6-methoxy-2-naphthyl)ethan-1-on was estimated to be 0.0623 Pa-m3/mole at 25 deg C