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1-N-butylpyridinium heptachlorodialuminate (CAS 67226-45-3) is strongly reactive: in contact with water an exothermic reaction occurs and HCl gas, aluminium oxide and N-butylpyridinium chloride (CAS 1124-64-7) are produced, therefore the substance itself will not remain in the environment under natural occurring conditions.

Hydrogen chloride is a highly volatile inorganic acid that is likely to completely evaporate during the exothermic reaction in aqueous environment. In water, hydrochloric acid is fully dissociated to form hydrogen and chloride ions, both of which are physiological electrolytes. Chloride ions and hydrogen ions, which combine with water to form the hydronium ion, are both normally present in the body and are also habitually found in the environment. Aluminium is the most abundant metallic element and constitutes 8.13% of the earth's crust. It is naturally released to the environment from the weathering of rocks and volcanic activity (WHO, 1997). It occurs ubiquitously in the environment in the form of silicates, oxides and hydroxides, combined with other elements such as sodium and fluorine and as complexes with organic matter. It is not found as a free metal because of its reactivity, the fate and transport of aluminum is largely controlled by environmental factors such as pH, salinity, and the presence of various species with which it may form complexes.

If the main hydrolysis product N-butylpyridinium chloride (CAS 1124-64-7) is exposed to water it will not binding to sediment due to a low adsorption potential and due to the low vapour pressure (0,002 Pa at 20°C), it is concluded that the substance will not accumulate in air and will not be transported through the vapour phase into other environmental compartments in relevant amounts. Thus, air is not a likely route of environmental contamination and no accumulation and subsequent deposition of N-butylpyridinium chloride is to be expected. Adsorption to solid soil phases (e.g. clay) is also not expected for N-butylpyridinium chloride (CAS 1124-64-7).

The parent substance 1-N-butylpyridinium heptachlorodialuminate (CAS 67226-45-3) was tested in a biodegradation study due to the fast hydrolysis the main breakdown products were tested as well. These breakdown products are not readily biodegradable according to OECD criteria.