Registration Dossier
Registration Dossier
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EC number: 232-019-7 | CAS number: 7783-66-6
Short-term toxicity to aquatic invertebrates
Administrative data
Link to relevant study record(s)
Description of key information
The toxicity of iodine pentafluoride to aquatic invertebrates is derived from ecotoxicity data of its degradation products iodide, iodate and fluoride. The most sensitive effect value was derived from the test with iodide.
Key value for chemical safety assessment
Fresh water invertebrates
Fresh water invertebrates
- Effect concentration:
- 0.17 mg/L
Additional information
No aquatic toxicity studies with iodine pentafluoride are available or can be performed as in contact with water iodine pentafluoride reacts instantly and violently under formation of hydrogen fluoride and iodate. Hydrogen fluoride will further react to fluoride and iodate in water forms an equilibrium with iodide. Therefore available data from studies with fluoride, iodate and iodide are given as indication of the aquatic toxicity of iodine pentafluoride.
In the Laverock study, daphnids (10/concentration) were exposed to a control and six concentrations of iodate and iodide under static conditions for 48 hours. The test concentrations were determined as % of lethal concentrations as determined in a preliminary test. For iodate the lethal concentration was determined at 1.0 g/L, for iodide this concentration was 1.0 mg/L (both expressed as elemental iodine). Test concentrations were analysed as total iodine in the test system. Mean ratios of final total iodine concentrations to initial total iodine concentrations were 1.06 and 0.99 for iodate and iodide, respectively. The 48-h LC50 values for iodate and iodide were 10.3 and 0.17 mg/L, respectively.
Several studies were performed investigating the toxicity of fluoride to aquatic invertebrates. The most sensitive effect value was found in benthic macroinvertebrates. In this study, fifth instar larvae of five caddisfly species were exposed to sodium fluoride in a static test system for 96 hours. The 96-h EC50 values for fluoride ranged from 26 to 48 mg/L (soft water).
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