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Environmental fate & pathways

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In general, two processes can significantly affect the fate and distribution of DEGDN in environment: microbiological transformations and photochemical transformation. Physical transport from aqueous systems is believed to be unimportant because both volatility and sediment adsorption coefficient of DEGDN are low. There is as yet no evidence for other important chemical transformation processes, such as hydrolysis or oxidation, under environmental conditions.

Hydrolysis of DEGDN was found to be extremely low under most environmental conditions. The hydrolysis was quite slow (t1/2 > 800 days) at pH 7. However, hydrolysis increased as the pH increased.

Photolysis was found to be major chemical transformation loss process for DEGDN, and half-lives ranging from 35 days in pure water to 27 days in natural water were observed. The estimated half-lives suggest that photolysis will compete with biotransformation in affecting the persistence of DEGDN in aqueous environments.

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.