Registration Dossier

Ecotoxicological information

Toxicity to microorganisms

Currently viewing:

Administrative data

Link to relevant study record(s)

Description of key information

Aluminum zirconium chloride hydroxide is an inorganic substance which will rapidly dissociate into aluminum, zirconium, chloride and hydroxide ions upon dissolution in the environment. However, zirconium ions will not remain as such in solution, and the environmental toxicity (if any) will not be driven by zirconium. Therefore, full read-across to other aluminum substances considering a typical aluminum content of ca. 19.4%  is justified. The highest reliable unbound NOEC value of ≥ 200 mg/L aluminum derived in an activated sludge respiration inhibition test is recalculated and results in a NOEC of ≥ 1031 mg/L aluminum zirconium chloride hydroxide.

Key value for chemical safety assessment

EC10 or NOEC for microorganisms:
1 031 mg/L

Additional information

Aluminum zirconium chloride hydroxide is an inorganic substance which will rapidly dissociate into aluminum, zirconium, chloride and hydroxide ions upon dissolution in the environment. However, zirconium ions will not remain as such in solution. Thus, regarding the environmental fate and toxicity of Aluminum zirconium chloride hydroxide, it can be assumed that environmental fate and toxicity (if any) will not be driven by zirconium. Therefore, full read-across to dialuminum chloride pentahydroxide (CAS #12042-91-0) and other aluminum substances considering a typical aluminum content of ca. 19.4% is justified. The table below presents an overview of the reliable microbial toxicity data of aluminum.

Species

endpoint

set up

result

(mg Al/l)

 

Activated sludge, domestic

EC10-180min

static

>200

Aluminum chloride

Activated sludge, domestic

EC10-3h

static

>4.4

Aluminum chloride hydroxide sulfate

One activated sludge respiration inhibition test with aluminum chloride is available. This test was performed with aluminum chloride CAS RN 7446-70-0 according to standard guideline. No effects were seen up to the highest test concentration of 1000 mg/l test material. The test substance contained 20 g Al/100 g and the test concentrations can be converted to mg/l Al. 1000 mg/l test material is equal to 200 mg/l Al. Another activated sludge respiration inhibition test is available. This test was performed with aluminum chloride hydroxide sulfate according to standard guideline. It was performed as limit test at 100 mg/l test material. The test substance contained 4.4% Al and the test concentrations can be converted to mg/l Al. 100 mg/l test material is equal to 4.4 mg/l Al.