Registration Dossier

Environmental fate & pathways

Endpoint summary

Administrative data

Description of key information

Additional information

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 be 900 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