Registration Dossier

Environmental fate & pathways

Phototransformation in air

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Description of key information

In the atmosphere, a half-life of 2.9 days for the constitutent adipic acid is estimated due to the reaction with photochemically produced hydroxyl radicals, considering a OH concentration of 500,000 radicals/cm³ as a 24h-average (Currenta, 2009).

Key value for chemical safety assessment

Additional information

For the mixture no data on phototransformation in air are available. Adipic acid is applied for read-across approach. Adipic acid is one of the constituents of the dicarboxylic acid mixture. All constituents are homologues linear alkyl dicarboxylic acids with a chain length of four to six carbon atom. The mixture is composed of three discrete carboxylic acids. Due to the structural relationship, adipic acid is a good representative for the dicarboxylic acid mixture. Adipic acid is well assessed on behalf of the ICCA/OECD HPV-program.