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Environmental fate & pathways

Phototransformation in water

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Description of key information

The photodegradation of the substance in water was investigated in two studies. The key study determined a half life of the substance in summer sunlight  (assuming 12 hours a day) at 30° N of 0.62 days. 
A further study was performed with [(5-chloroquinolin-8-yl)oxy]acetic acid (i.e. the main transformation product in soil and water/sediment systems).

Key value for chemical safety assessment

Half-life in water:
0.62 d

Additional information

The key study (Schaffer, 1991) is a GLP-compliant test conducted according to EPA guideline subdivision N 161-2 (photodegradation studies in water). The photodegradation of the test substance in water was evaluated under artificial light (wavelenght <290 nm, relative light intensity based on intensity of sunlight: 0.63 based on midday midsummer at 50° N)) and the half life of the substance in summer sunlight at 30° N was determined to be 0.62 days (assuming 12 hours of sunlight). A GLP compliant, guideline (UBA Test Guideline "Phototransformation of Chemicals in Water, Part A, Direct Phototransformation", Berlin, FRG, January 1990) supporting study (Phaff, 1996) also found that the photochemical half-life of the substance in surface waters is likely to be short.

A GLP compliant, guideline (UBA Test Guideline "Phototransformation of Chemicals in Water, Part A, Direct Phototransformation", Berlin, FRG, January 1990) supporting study (Abildt, 1995) found that the photochemical half-life of [(5-chloroquinolin-8-yl)oxy]acetic acid in surface waters is likely to be short.