Registration Dossier
Registration Dossier
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EC number: 913-635-1 | CAS number: -
Endpoint summary
Administrative data
Description of key information
According to the Canadian Environmental Protection Act (ECHC, 2001), sensitive terrestrial plants may be affected by soil concentrations greater than about 68 mg sodium/kg and 215 mg chloride/kg. Areas with such soil concentrations extend linearly along roads and highways or other areas where road salts are applied for de-icing or dust control. The impact of aerial dispersion extends up to 200 m from the edge of multi-lane highways and 35 m from two-lane highways where de-icing salts are used. Salt injury to vegetation also occurs along watercourses that drain roadways and salt handling facilities (ECHC, 2001).
Additional information
No information is available on the toxicity of the reaction mass of calcium chloride and sodium chloride to terrestrial organisms. No information is available on calcium chloride. However, the acute and chronic toxicity of sodium chloride has been examined in various terrestrial species, including worms, arthropods, macrophytes, and birds. In chronic studies with terrestrial organisms, the LOEC (based on reproduction) for NaCl was reported as 1325 mg/kg soil in a 10 -week study with the earthworm, Eisenia fetida. In a chronic terrestrial macrophyte study, the lowest reported NOEC of 243 mg/kg soil dw was based on stem growth in Kentucky blue grass. The mean 14 -day LC50 for sodium chloride and the earthworm, E. fetida, was 3305 mg/kg dw. In a 7-day exposure study with red fescue grass, the IC50 for germination was 500.8 mg NaCl/kg soil dw. The 12-hour LD50 for wild house sparrows was approximately 3000-3500 mg/kg NaCl.
Few data are available for calcium chloride, and there is no information supporting the fact that calcium chloride may be more toxic than sodium chloride towards terrestrial organisms.
Taken together, the lowest terrestrial toxicity value was the NOEC of 243 mg/kg soil dw based on Kentucky bluegrass growth.
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