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EC number: 231-208-1
CAS number: 7446-70-0
Aluminium chloride is highly soluble in
water dissociating to aluminium hydroxide and hydrochloric acid and
thereby may change the pH of an aquatic system towards acidic. The
latter is strongly dependent on the buffer capacity. Under circum
neutral conditions, as typically met in most surface waters, aluminium
hydroxide is forming complexes, precipitating to gibbsite. Under these
conditions, bioaccumulation of aluminium is unlikely. However, under low
pH conditions (< 6) aluminium may stay dissolved and may accumulate in
fish. It is well established, that aluminium may accumulate in and on
the gill (e.g. Poleo et al. 1995). It has been suggested that the rate
of transfer of aluminium into the body of fish is either slow or
negligible under natural environmental conditions (Spry and Wiener
1991). The initial uptake of aluminium by fish essentially takes place
not on the gill surface but mainly on the gill mucous layer (Wilkinson
and Campbell 1993). Fish may rapidly eliminate mucous and the bound
aluminium following the exposure episode. In general, the potential for
accumulation in fish will depend on the aluminium species present, and
is therefore dependent on pH temperature, dissolved organic carbon (DOC)
and numerous other ligands (Environment Canada 2000). According to EHC
194, bioconcentration factors for aluminium are inversely related to pH.
For example: 215 at pH 5.3, 123 at pH 6.1 and 36 at pH 7.2. Based on
results published by Roy R. (1999), Environment Canada (2000) calculated
BCFs for fish in the range of 400 to 1365.
- Cleveland L & Brumbaugh WG (1991). Residue
dynamics and effects of aluminum on growth and mortality in brook trout.
Environ Toxicol Chem 10: 243-248. Cited in EHC 194.
- Environment Canada (2000). State of
science report for Aluminium chloride, Aluminium nitrate and Aluminium
sulphate, Dec 2000
- Poleo ABS et al. (1995). Survival of
crucian Carp, Carassius carassius, exposed to a high low-molecular
weight inorganic Aluminium challenge source. Aquat Sci 57(4): 350-359
- Roy R (1999). The chemistry,
bioaccumulation and toxicity of aluminum in the aquatic environment for
the PSL2 assessment of aluminum salts. Report prepared by Fisheries and
Oceans Canada for Environment Canada. 110 pp. (unpublished). Cited in:
Evironment Canada (2000)
- Spry DJ, Wiener JG (1991). Metal
bioavailability and toxicity to fish in low-alkalinity lakes - a
critical review. Environ Pollut 71: 243-304. Cited in: Environment
- WHO (1997). Environmental health criteria
(EHC) 194, Aluminium
- Wilkinson KJ, PGC (1993). Aluminum
bioconcentration at the gill surface of juvenile Atlantic salmon in
acidic media.Environ Toxicol Chem 12: 2083-2095. Cited in:
Information on Registered Substances comes from registration dossiers which have been assigned a registration number. The assignment of a registration number does however not guarantee that the information in the dossier is correct or that the dossier is compliant with Regulation (EC) No 1907/2006 (the REACH Regulation). This information has not been reviewed or verified by the Agency or any other authority. The content is subject to change without prior notice.Reproduction or further distribution of this information may be subject to copyright protection. Use of the information without obtaining the permission from the owner(s) of the respective information might violate the rights of the owner.
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