Chromium hydroxide sulphate

Toxicity to soil macroorganisms except arthropods

Administrative data

Endpoint:

toxicity to soil macroorganisms except arthropods: short-term

Type of information:

experimental study

Adequacy of study:

key study

Study period:

14 days

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

test procedure in accordance with generally accepted scientific standards and described in sufficient detail

Justification for type of information:

Peer reviewed publication describing research work in good detail

Data source

Reference

Reference Type:

publication

Title:

Unnamed

Year:

2005

Materials and methods

Test guideline

Qualifier:

equivalent or similar to guideline

Guideline:

OECD Guideline 207 (Earthworm, Acute Toxicity Tests)

Version / remarks:

14 days exposure

Principles of method if other than guideline:

Different soil types were assessed as well as effect of pH

GLP compliance:

not specified

Test material

Test material information

Constituent 1

Reference substance name:

Chromic chloride

IUPAC Name:

Chromic chloride

Sampling and analysis

Analytical monitoring:

not specified

Test substrate

Vehicle:

no

Test organisms

Test organisms (species):

Eisenia fetida

Animal group:

annelids

Details on test organisms:

6-week-old worms of uniform size (300–400 mg) were used

Study design

Study type:

laboratory study

Substrate type:

natural soil

Limit test:

no

Total exposure duration:

14 d

Post exposure observation period:

No

Test conditions

Test temperature:

28 C

pH:

5.72 - 7.12 depending on soil types

Moisture:

moisture content 40% to 60%

Details on test conditions:

The soils were air-dried and sieved through a 1-mm sieve for use in the analysis of various soil properties.
Dried, urine-free cow dung manure was ground and sieved (particle size, 500 to p100 mm) to serve as the organic substrate medium.

Nominal and measured concentrations:

500, 1000, 1500, 2000, 2500, and 3000 mg/kg as Chromium III

Results and discussion

Effect concentrations

Key result

Duration:

14 d

Dose descriptor:

LC50

Effect conc.:

> 1 635 - < 1 902 mg/kg soil dw

Nominal / measured:

nominal

Conc. based on:

element

Basis for effect:

mortality

Details on results:

Slight differences were seen between the different soil types, but this is not significant.

Any other information on results incl. tables

Changes were not observed in the morphology of earthworms or their burrowing behaviour in both soil and organic media at all concentrations

Applicant's summary and conclusion

Conclusions:

Toxicity was observed at high concentrations, but surviving worms showed no morphological changes.
The same study looked at toxicity of Chromium VI (potassium dichromate) and this demonstrated much higher toxicity.