Nickel dihydroxide

Toxicity to aquatic plants other than algae

Administrative data

Endpoint:

toxicity to aquatic plants other than algae

Type of information:

migrated information: read-across based on grouping of substances (category approach)

Adequacy of study:

other information

Reliability:

2 (reliable with restrictions)

Rationale for reliability incl. deficiencies:

other: see 'Remark'

Remarks:

Peer reviewed data. Results from the static-renewal portion of the study were accepted. pH in the static test reached an equilibrium value of 7.2. At this pH and at the test hardness of 300 mg/L CaCO3, chemical speciation modeling indicated that precipitation of NiCO3 was possible. Results from the static test were therefore rejected.

Data source

Reference

Reference Type:

secondary source

Title:

SIDS Initial Assessment Profile on Nickel and Nickel Compounds-Draft SIAR

Author:

OECD

Year:

2007

Bibliographic source:

SIDS Dossier -Draft

Materials and methods

Test guideline

Qualifier:

according to guideline

Guideline:

OECD Guideline 221 (Lemna sp. Growth Inhibition Test)

GLP compliance:

not specified

Test material

Test material information

Constituent 1

Reference substance name:

Nickel sulphate

EC Number:

232-104-9

EC Name:

Nickel sulphate

Cas Number:

7786-81-4

IUPAC Name:

nickel(2+) sulfate

Constituent 2

Reference substance name:

nickel sulfate

IUPAC Name:

nickel sulfate

Details on test material:

- Name of test material (as cited in study report): Ni-Sulfate
- Analytical purity: reagent grade

Sampling and analysis

Analytical monitoring:

yes

Test solutions

Vehicle:

no

Test organisms

Test organisms (species):

Lemna gibba

Details on test organisms:

TEST ORGANISM
- Common name: duckweed
- Method of cultivation: All test organisms were maintained prior to testing in artificial 20X-APP growth medium.

Study design

Test type:

semi-static

Water media type:

freshwater

Limit test:

no

Total exposure duration:

7 d

Test conditions

Hardness:

± 300 mg/l CaCO3,

Test temperature:

26 °C

pH:

6.5

Nominal and measured concentrations:

Ni was added as Ni-sulfate using 6 different treatments and 1 control using a 2 fold increasing concentration series.

Details on test conditions:

TEST SYSTEM
- No. of colonies per vessel: Approximately 2 to 3 duckweed colonies
- No. of fronds per colony: totalling 8 to 10 fronds
- No. of vessels per concentration (replicates): 4
- No. of vessels per control (replicates): 4


GROWTH MEDIUM
- Standard medium used: yes

Results and discussion

Effect concentrations

Effect concentrations 1

Duration:

7 d

Dose descriptor:

EC10

Effect conc.:

0.05 - 0.08 µg/L

Conc. based on:

element

Remarks:

Nickel

Basis for effect:

not specified

Effect concentrations 2

Duration:

7 d

Dose descriptor:

EC10

Effect conc.:

0.078 - 0.12 mg/L

Conc. based on:

other: Nickeldihydroxid

Basis for effect:

not specified

Remarks on result:

other: result calculated for Nickeldihydroxid