Barium chromate

Toxicity to aquatic algae and cyanobacteria

Administrative data

Endpoint:

toxicity to aquatic algae and cyanobacteria

Type of information:

experimental study

Adequacy of study:

key study

Reliability:

2 (reliable with restrictions)

Rationale for reliability incl. deficiencies:

other: see 'Remarks'

Remarks:

The EU RAR summarises results from a number of algal studies which, individually, have limitations regarding study design and reliability. However, the results of these studies when taken as a whole, provide an adequate assessment of the toxicity to algae. The data are considered to fulfil the criteria laid down in Annex XI to Regulation 1907/2006: adequate for classification and labelling, adequate coverage of key parameters (growth inhibition), exposure duration comparable or longer that Article 13(3) methods (72 hours), adequate documentation provided: EU RAR, of which parts have been copied to this endpoint record. Reliability for endpoint also increased based on test results from several species.

Data source

Reference

Reference Type:

review article or handbook

Title:

Unnamed

Year:

2005

Materials and methods

Test guideline

Qualifier:

no guideline followed

Principles of method if other than guideline:

Several studies, collectively, provide a weight-of-evidence to support toxicity to algae

GLP compliance:

no

Test material

Test material information

Constituent 1

Reference substance name:

Chromium

EC Number:

231-157-5

EC Name:

Chromium

Cas Number:

7440-47-3

Molecular formula:

Cr

IUPAC Name:

chromium

Sampling and analysis

Details on sampling:

Various sampling procedures based on multiple studies

Test solutions

Details on test solutions:

Various test media prepared based on multiple studies

Test organisms

Test organisms (species):

other: Range of species tested

Test conditions

Hardness:

Range used from several studies

Test temperature:

Range used from several studies

pH:

Range used from several studies

Dissolved oxygen:

Range used from several studies

Salinity:

Range used from several studies

Details on test conditions:

Range used from several studies

Results and discussion

Effect concentrations

Duration:

96 h

Dose descriptor:

EC50

Effect conc.:

0.32 mg/L

Any other information on results incl. tables

Species	Chemical tested	Method/comment	Endpoint (mg Cr/l)	Reference
ALGAE
Chlorella pyrenoidosa	Chromium potassium sulphate	Biomass Cell no.	5d-NOEC >2 5d-NOEC 0.1	Meisch and Schmitt-Beckmann, 1979
Selenastrum capricornutum	Chromic chloride	Biomass	96h-EC50= 0.32	Greene et al, 1988
Scenedesmus subspicatus	Chromium hydroxide sulphate	Oxygen production inhibition	24h-NOEC > 0.313	IUCLID, 1999

Applicant's summary and conclusion

Conclusions:

Several studies have been conducted on several test materials which have been collected in the EU RAR.