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Environmental fate & pathways

Phototransformation in air

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Metal carboxylates are substances consisting of a metal and a carboxylic acid. Based on the solubility of strontium neodecanoate in water (8.47 g dissolved Sr/L at pH 8.4 corresponding to 45.07 g strontium neodecanoate/L), a complete dissociation of strontium neodecanoate resulting in strontium and neodecanoate ions may be assumed under environmental conditions. The indirect photochemical degradation of neodecanoic acid as mediated by OH-attack is estimated to have a half-life of 1.2 days or 13.9 hours based on a 12 -hour sunlight day, a rate of 7.54E-12 cm3/molecule*sec. A 12-hour day half-life value normalizes degradation to a standard day light period during which hydroxyl radicals needed for photolysis are generated in the atmosphere. Although neodecanoic acid has the potential to degrade rapidly by OH-attack, multimedia distribution modelling indicates neodecanoic acid is predicted to partition negligibly (0.1%) to the air compartment because it has a low vapor pressure (0.9 Pa) and a relatively short atmospheric oxidation half-life (13.9 hours). Therefore, this process is unlikely to contribute significantly to the loss of neodecanoic acid from the environment. For strontium ions the concept of phototransformation is not applicable and therefore phototransformation in sum does not seem to play a role for strontium neodecanoate.