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No data are available for phototransformation in water. This is not expected to be a significant removal process for H2-L2, dimethylsilanol or dimethylsilanediol; in the case of H2-L2, this is due to its rapid hydrolysis in water.

Experiments carried out for dimethylsilanediol indicate that water soluble small molecule silanols may undergo aqueous photolytic oxidative demethylation with tropospheric ultraviolet radiation in the presence of suitable chromophores, such as nitrogen oxides, to give silicic acid and carbon dioxide (Buch et al, 1984).

Such degradation is also possible for the intermediate silanol hydrolysis product dimethylsilanol. However, it is not taken into account in the exposure assessment for dimethylsilanediol or dimethylsilanol.

Buch RR, Lane TH, Annelin RB, Frye CL (1984). Photolytic Oxidative Demethylation of Aqueous Dimethylsiloxanols, Environmental Toxicology and Chemistry, Vol 3, pp 215-222.