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Environmental fate & pathways

Phototransformation in water

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Although according to Annex IX of the Regulation (EC) No 1907/2006 REACH concerning the Registration, Evaluation, Authorisation and Restriction of Chemicals (REACH), phototransformation in water is not a mandatory information requirement, Results from a reliable study (Schmidt 1992) are provided for information.

Key value for chemical safety assessment

Additional information

Waiver: In accordance withAnnex IX of the Regulation (EC) No 1907/2006 REACH concerning the Registration, Evaluation, Authorisation and Restriction of Chemicals (REACH), phototransformation in water is not a mandatory information requirement.

 

For information, there are no available data on photolysis of DMDMH, however, there is a reliable study for phototransformation in water available for the hydrolysis product, DMH.   Due to the rapid hydrolysis of DMDMH to DMH studies conducted with the hydrolysis product, DMH, are considered relevant for environmental fate and ecotoxicology and are considered in this dossier.

 

Schmidt (1992) conducted a reliable (Klimisch 1) GLP compliant study following U.S EPA FIFRA N-161-2 40 CFR Section 151.30 methods. The objectives of the study were to determine the photolysis rate constants and half-lives of 14C-DMH and characterize photolysis products (>10% of the initial concentration of the 14C-DMH) of 14C-DMH in an aqueous buffer of pH 7 after exposure to a xenon arc lamp. The results of the study demonstrated that DMH was not subject to photodegradation in aqueous media at pH 7 and is therefore stable under these conditions. The kcpwas determined to be 7.89 x 10-4days-1and t1/2Ewas 878 days.

 

Although according to Annex IX of the Regulation (EC) No 1907/2006 REACH concerning the Registration, Evaluation, Authorisation and Restriction of Chemicals (REACH), phototransformation in water is not a mandatory information requirement, Results from a reliable study (Schmidt 1992) are provided for information.