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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:
342 d

Additional information

Schwarz (1982) cited by Buxton et al. (1988) examined the indirect photolysis of 2,2’,2’’-nitrilotriethanol in surface water by OH-radicals. A rate constant of 1.3E-11 cm³/(molecule*s) was estimated. For calculating the half-life, a measured OH-concentration of 3.0E-18 mol/l as an average value for a water column of 14 m derived by Zepp (1987) was used. The half-life of 2,2’,2’’-nitrilotriethanol is calculated to be 342 d. At summer noons near the water surface, the OH-concentration is much higher and may reach levels up to 2.5E-16 mol/l. At such a concentration the half-life is calculated to be approximately 4 days.