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Environmental fate & pathways

Phototransformation in water

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Description of key information

Key value for chemical safety assessment

Half-life in water:
59 d

Additional information

Phase I photolysis studies on DEGDN gave an estimated environmental quantum yield of 0.037, which is a factor of 5 lower than found in Phase II (0.18). There are several reasons for this difference, the most important of which is that the previous work used a value of ∑ε(λ)L(λ) for PNAP which was low by a factor of about 3. Less important differences are that the earlier work

1) used borosilicate vials instead of quartz tubes, the former of which could have filtered out a small fraction of the sunlight below 320 nm,

2) used Spring L(λ) values in the calculations but irradiations were performed in early summer,

3) used ε(λ) values for DEGDN determined at lower concentration, which were inherently less accurate for the weak absorbance tail extending to wavelengths up to nearly 650 nm,

4) used an actinometer which photolyzed about 30 times faster than DEGDN, making correlation of the two rates less accurate.

From the first-order photolysis rate constant, half-lives ranging from 15 days in the summer to 59 days in the winter were determined. The quatum yield for photolysis was measured to be 0.18. Photolytic transformation products were identified as 2 -hydroxyethylinitratoacetate, nitrate glycolic acid and formic acid.