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Environmental fate & pathways

Phototransformation in water

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Description of key information

Fe complex of DTPA was exposed to simulated sunlight and the rate of degradation was measured.

Key value for chemical safety assessment

Half-life in water:
0.01 d

Additional information

The half life for a 1:1 complex of Fe:DTPA in aqueous solution exposed to simulated sunlight was 8 minutes (<0.01days). The Fe complex is a common complex for chelants in the environment. Supporting study also showed that DTPA added as free acid degraded photochemically in humic lake water. Fe(III)DTPA was shown to be very photolabile in humic lake water in the summer where the photochemical half-life was below one hour.