Zirconium hydroxysulphate

Short-term toxicity to aquatic invertebrates

Link to relevant study record(s)

Reference

Endpoint:

short-term toxicity to aquatic invertebrates

Type of information:

experimental study

Adequacy of study:

key study

Study period:

7 days

Reliability:

2 (reliable with restrictions)

Rationale for reliability incl. deficiencies:

study well documented, meets generally accepted scientific principles, acceptable for assessment

Justification for type of information:

Peer reviewed research for Zr.
Sulphate is not considered sufficiently hazardous to aquatic organisms to contribute to the assessment

Principles of method if other than guideline:

A one-week toxicity test with young Hyalella, including feeding, was used because 48-h acute tests without food are difficult to conduct with young Hyalella, which swim and stick to the surface if not fed.

GLP compliance:

not specified

Specific details on test material used for the study:

Most experiments were conducted using atomic absorption standards containing 1 g metal/. For zirconium, this was obtained from Sigma-Aldrich (Oakville, ON, Canada);

Test organisms (species):

other aquatic crustacea: Hyalella azteca

Details on test organisms:

Hyalella used for toxicity tests originated from Valens Conservation Area (ON, Canada), in 1985.
initial age of the test animals 1 to 11 d at the start of the test

Test type:

static

Water media type:

freshwater

Total exposure duration:

7 d

Hardness:

Tap water: dechlorinated Burlington City tap (Lake Ontario, Canada) water (hardness 124 mg/L)
Soft water: 10% tap water and 90% Milli-Qt (Millipore, Bedford, MA, USA) deionized water (hardness 18 mg/L)

Test temperature:

24-25 deg C

pH:

Tap water: 8.39 (Range 8.09–8.84)
Soft water: 7.39 (Range 6.44–8.52)

Details on test conditions:

16:8-h light:dark photoperiod
Tests were conducted in 400 ml of test water in 500-ml polyethylene cups (snap-top specimen containers).
2.5-mg Tetra-Min (Ulrich Baensch, Melle, Germany) fish food flakes were added to each container, followed by addition of 15 young
Hyalella. Test containers were not aerated during the test. An additional 2.5 mg of food was provided midweek.

Duration:

7 d

Dose descriptor:

LC50

Effect conc.:

> 1 mg/L

Nominal / measured:

nominal

Conc. based on:

element

Remarks on result:

other: soft water

Duration:

7 d

Dose descriptor:

LC50

Effect conc.:

> 3.15 mg/L

Nominal / measured:

nominal

Conc. based on:

element

Remarks on result:

other: tap water

Duration:

7 d

Dose descriptor:

EC50

Effect conc.:

ca. 8 mg/L

Nominal / measured:

nominal

Conc. based on:

other: Calculated for registered substance

Basis for effect:

mortality

Validity criteria fulfilled:

not specified

Conclusions:

The toxicity of zirconium to Hyalella azteca was measured as part of a study measuring the toxicity of 63 metals. Zirconium showed relatively low toxicity with LC50> 1 mg/L in soft water and > 3.15 mg/L in tap water.
The Zr 4+ content of the anhydrous registered substance is 37% suggesting a calculated EC50 8.5 mg/l

Executive summary:

The toxicity of zirconium to Hyalella azteca was measured as part of a study measuring the toxicity of 63 metals. Zirconium showed relatively low toxicity with LC50> 1 mg/L in soft water and > 3.15 mg/L in tap water.

The Zr 4+ content of the anhydrous registered substance is 40% suggesting a calculated EC50 ca 8 mg/l

Description of key information

The toxicity of zirconium to Hyalella azteca was measured as part of a study measuring the toxicity of 63 metals. Zirconium showed relatively low toxicity with LC50> 1 mg/L in soft water and > 3.15 mg/L in tap water.

The Zr 4+ content of the anhydrous registered substance is 40% suggesting a calculated EC50 ca 8 mg/l

Sulphate is not considered sufficiently hazardous to aquatic organisms to contribute to the assessment

Key value for chemical safety assessment

Fresh water invertebrates

Fresh water invertebrates

Effect concentration:

8.5 mg/L