Registration Dossier

Administrative data

Endpoint:
additional ecotoxicological information
Type of information:
experimental study
Adequacy of study:
supporting study
Study period:
2006
Reliability:
4 (not assignable)
Rationale for reliability incl. deficiencies:
other: Chinese original, only abstract available

Data source

Reference
Reference Type:
publication
Title:
Effects of Rare Earth Elements on Soil Fauna Community Structure and their Ecotoxicity to Holotricha Parallela
Author:
Li G et al.
Year:
2006
Bibliographic source:
Chinese Journal of Applied Ecology, 17 (1) 159-162

Materials and methods

Test guideline
Qualifier:
according to
Guideline:
other: OECD filter paper contact method
GLP compliance:
not specified
Type of study / information:
The effects of rare earth oxides on soil fauna community structure and their ecological toxicity to Holotricha parallela were investigated using the OECD filter paper contact method.

Test material

Reference
Name:
Unnamed
Type:
Constituent
Details on test material:
A mixture of rare earth oxides was used. Concentrations: 0.92 to 2425.5 g/plot 8 concentrations.
The distribution of the following 9 species was investigated after different treatments:
Phretima aspergillum
Arachnida
Armadilldium vulgare
Paraluperodus suturalis microbilineatus
Riptortus clarantus
Colaphellus bovringi
Chlaenius spoliatus
Euborellia pallipes
Hylemia platura
Diplopoda spp.
Grylliclae crichet
Agrotis ypsilon (larvae)
Tetrigidae grouse-locust
Gryllotalpa africana
Phynotreta vitata Fabricius
Nabia Sinoferus
Paederus fuscipes
Clanis bilineata (larvae)
Holotichia parallela (larvae)

Results and discussion

Any other information on results incl. tables

No treatment related differences between control and treated fauna species were observed. Quantity of main species and diversity index were unchanged.Acute and chronic toxicity to Holotrichia parallela was very low: Concentrations up to 3000 mg REcomppound/l did not increase death rates compared to controls after 72 h acute exposure. Chronic exposure to Holotrichia parallela to up to 3000 mg rare earth compound/kg did not lead to significant changes in pup numbers, pupation percentage, emergence number, emergence percentage, death number and death ratio compared to untreated controls. The NOEC for chronic toxicity to was > 3000 mgLa/kg. The NOEC for ecological effects was >= 2425 g rare earth oxide/plot

Applicant's summary and conclusion

Conclusions:
At very high concentrations rare earth chlorides and oxides did not show any acute and chronic toxicity to Holotrichia parallela and did not influence species distribution and diversity index of 9 soil species.
Executive summary:

At very high concentrations rare earth chlorides and oxides did not show any acute and chronic toxicity to Holotrichia parallela and did not influence species distribution and diversity index of 9 soil species.